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Estudo comparativo de métodos de amostragem de comunidades de Costão
Provedor de dados: 57
Autores: SABINO,C. M.; VILLAÇA,R.
O presente estudo compara três metodologias de amostragem de costão rochoso: estimativa visual, pontos de interseção e raspagem total do substrato. No método de estimativa visual, variou-se o tamanho do amostrador e, no de pontos de interseção, o número de pontos marcados. As amostras foram coletadas no costão da praia do Forno, Búzios, RJ, em duas faixas, uma dominada fisionomicamente por Amphiroa sp. e a outra, por Sargassum furcatum. Foram aplicados testes de ANOVA e Kruskal-Wallis aos resultados encontrados, utilizando-se como variáveis os índices bionômicos de número de espécies, porcentagem total de recobrimento, índice de diversidade e índice de uniformidade. Os resultados provaram que nenhuma metodologia de amostragem semelhante mostrou-se...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Metodologia de amostragem; Costão rochoso; Fitobentos; Búzios; RJ.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300005

Padrões e processos na evolução do tamanho do corpo em carnívoros (Mammalia) da América do Sul
Provedor de dados: 57
Autores: DINIZ-FILHO,J. A. F.; VIEIRA,C. M.
Nos últimos anos, muitos modelos têm sido propostos a fim de ligar os processos microevolutivos aos padrões macroevolutivos. Dentre estes, o movimento Browniano e o processo Ornstein-Uhlenbeck (O-U) têm sido utilizados, respectivamente, para modelar a evolução de um caráter quantitativo sob efeito de deriva genética e seleção estabilizadora. Uma vez que esses processos produzem curvas diferentes de relação entre variância interespecífica e tempo de divergência, eles podem ser distinguidos através de correlogramas filogenéticos. Neste trabalho, padrões no tamanho do corpo de 17 espécies de Carnívora sul-americanos foram analisados através de correlogramas filogenéticos, construídos com índices I de Moran em quatro classes de distância no tempo. O...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carnívoros; Tamanho do corpo; Filogenia; Autocorrelação; Correlogramas; Seleção estabilizadora.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400012

Clareiras naturais e a riqueza de especies pioneiras em uma floresta Atlantica montana
Provedor de dados: 57
Autores: TABARELLI,M.; MANTOVANI,W.
A abertura de clareiras naturais, causada pela queda de uma ou mais árvores do dossel, é considerada um mecanismo de manutenção da diversidade de árvores e arbustos nas florestas tropicais. Em um trecho da floresta Atlântica montana no Sudeste do Brasil, foram amostrados todos os indivíduos maiores que 1 m de altura em 30 clareiras (30,3-500,5 m²). Entre as 220 espécies arbóreo-arbustivas amostradas, 24% foram pioneiras, sendo 88,7% de ciclo de vida curto e 11,3% de ciclo de vida longo. Espécies de Miconia, Leandra e Rapanea representaram 49% do total das espécies e 62,1% do total dos indivíduos pioneiros amostrados. No local de estudo, a idade, a área das clareiras, a altura do dossel adjacente e a cobertura de bambu explicaram entre 20% e 73% das...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clareiras naturais; Bambu; Floresta Atlântica; Plantas pioneiras; Riqueza de espécies.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200009

Diel changes in food and feeding activity of sciaenid fishes from the South-western Atlantic, Brazil
Provedor de dados: 57
Autores: SOARES,L. S. H.; VAZZOLER,A. E. A. de M.
Food habits and daily feeding activity of fish populations are important ecological variables for understanding their role in the ecosystem. Diel changes in feeding activity and dietary composition of juvenile whitemouth croaker Micropogonias furnieri, shortfin corvina Isopisthus parvipinnis, shorthead drum Larimus breviceps and of juvenile and adult banded croaker Paralonchurus brasiliensis were investigated from samples taken over a 24 hours period from 4 to 5 September 1987 on the continental shelf off South-eastern Brazil. Whitemouth croaker and banded croaker had a benthic diet based on polychaetes and some caridean shrimps and showed no diel feeding pattern. Shortfin corvina and shorthead drum fed on crustaceans and teleostean fish, the former...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diel feeding; Food habits; Teleostei; Sciaenidae; South-western Atlantic.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200004

Genotoxic evaluation of the effect of Thuya occidentalys tinctures
Provedor de dados: 57
Autores: VALSA,J. O.; FELZENSZWALB,I.
Three tinctures samples from extracts of the popular medicinal plant Thuya occidentalis were tested in vitro through two short term tests for measuring the activity of genotoxic chemicals. Using the Salmonella/mammalian-microsome (Mutatest) assay and the SOS-chromotest (induction of beta-galactosidase in Escherichia coli), none of the extract was effective in inducing mutagenesis or beta-galactosidase synthesis (as an indicator of general and early sign of DNA damage), even with metabolization.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thuya occidentalis; Salmonella/mammalian-microsome assay; SOS-chromotest; Popular medicine.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200017

Variation and life strategies of the Trichoptera (Insecta) larvae community in a first order tributary of the Paquequer River, Southeastern Brazil
Provedor de dados: 57
Autores: HUAMANTINCO,A. A.; NESSIMIAN,J. L.
The Trichoptera fauna was sampled in a first order tributary of Paquequer River, in the district of Teresópolis, Rio de Janeiro State. Quantitative samples of litter from pools, litter from riffles, sand, and stones were taken on each season from February 1991 to February 1992.The life cycles of common genera were categorized into three groups of biological strategies. The largest group represented the general profile of the community, in which ultimate instar larvae were predominant in spring and the younger ones in summer. Probably, emergence and oviposition occur in spring.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trichoptera; Larvae; Life strategies; Streams; Atlantic Forest.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100010

Periwinkle (Gastropoda: Littorinidae) habitat selection and its impact upon microalgal populations
Provedor de dados: 57
Autores: APOLINÁRIO,M.; COUTINHO,R.; BAETA-NEVES,M. H.
The present study examines habitat selection and grazing pressure of the periwinkle Nodilittorina lineolata (Gmelin, 1791) on the rocky shore of Arraial do Cabo, RJ, Brazil (lat. 23°S, long. 43°W). Transfer experiments suggest that periwinkles actively select the mid intertidal, where the cirripede Chthamalus bisinuatus Pilsbry is the dominant sessile invertebrate. We also conducted a caging experiment in the middle intertidal, manipulating grazers and light, to assess the impact of grazing upon microalgal density. Grazing pressure significantly reduced microalgal abundance at the mid-intertidal level, suggesting that food availability plays an important role in the habitat selection of periwinkles on the studied shore.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brazil; Habitat selection; Intertidal; Littorinidae; Microalgae.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200005

Estimating parasitoid immature mortality by comparing oviposition and pupal development of Trichogramma galloi ZUCCHI and T. pretiosum RILEY on natural and factitious hosts
Provedor de dados: 57
Autores: CÔNSOLI,F. L.; PARRA,J. R. P.; VINSON,S. B.
Mortality during the immature development of T. galloi and T. pretiosum was estimated on UV-killed and live eggs of a factitious and a natural host, respectively. A staining technique was used to determine the actual parasitization of UV-treated eggs and was compared with the number of parasitoids that emerged per host egg (detectable parasitization). Effects of temperature as a factor of mortality during the immature development of both parasitoids on the factitious host was also assessed. The actual and detectable parasitization of live hosts was measured by recording both the parasitization behavior and the number of eggs where a parasitoid developed successfully. Our data show that mortality during immature development of both parasitoids may occur in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological control; Host exploitation; Host/parasitoid interaction; Host suitability; Immature mortality; Parasitoid fitness; Parasitization rate.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300003

A composição dos bandos mistos de aves na Mata Atlântica da Serra de Paranapiacaba, no sudeste brasileiro
Provedor de dados: 57
Autores: MACHADO,C. G.
Bandos mistos de aves são agrupamentos de duas ou mais espécies cuja formação e coesão se devem a interações comportamentais entre seus integrantes. Este estudo investigou a composição dos bandos mistos na Mata Atlântica do Parque Estadual Intervales, no alto da Serra de Paranapiacaba, SP, Brasil (24º12' a 24º25'S; 48º03' a 48º30'W). Foram feitas visitas mensais de abril de l990 a março de l991. A cada bando contatado registrava-se o número de indivíduos, composição e distribuição específica dentro dos bandos e na vegetação. Em 388 contatos com bandos mistos, registrou-se um total de 120 espécies de aves, com apenas três espécies regulares: Basileuterus culicivorus, Philydor rufus e Sittasomus griseicapillus. O número de indivíduos e de espécies por bando...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bandos mistos de aves; Mata Atlântica; Comportamento de forrageamento.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100010

Home range of the Tropidurid lizard Liolaemus lutzae: sexual and body size differences
Provedor de dados: 57
Autores: ROCHA,C. F. D.
The home range of the Tropidurid lizard Liolaemus lutzae, an endemic species of the costal sand dune habitats of Rio de Janeiro State, was studied in the beach habitat of Barra de Maricá restinga, Maricá County. Home ranges were studied using a mark-recapture technique in a delimited area at the beach habitat. I considered for estimates and analysis the home ranges of those lizards with a minimum of four positions. The size of L. lutzae home ranges varied according to the segment of the population. The mean home range size of adult males (x = 59.8 ± 33.7 m²) was significantly larger than that of adult females (x = 22.3 ± 16.1 m²). Juvenile mean home range size was significantly smaller than that of adult males, but did not differ from that of adult females...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Home range; Endemism; Territory; Lizard; Restinga.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100016

Ficoflórula do Lago Amapá em Rio Branco-Acre, II: Chlorophyta
Provedor de dados: 57
Autores: KEPPELER,E. C.; LOPES,M. R. M.; LIMA,C. S.
Este trabalho está baseado em 15 amostras coletadas quinzenalmente, entre março e maio de 1994, adicionadas de três coletas mensais em julho, outubro e novembro de 1994, no Lago Amapá (lat. 10°2'36"S, long. 67°50'24"W) em Rio Branco, Estado do Acre. Registrou-se da divisão Chlorophyta 10 táxons, sendo Botryococcaceae (02), Treubariaceae (01), Volvocaceae (02), Closteriaceae (03) e Desmidiaceae (02). Todos os táxons identificados são citados pela primeira vez para o Estado do Acre.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fitoplâncton; Taxonomia de Chlorophyta; Estado do Acre.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400017

Fitoplâncton de um reservatório eutrófico (lago Monte Alegre), Ribeirão Preto, São Paulo, Brasil
Provedor de dados: 57
Autores: SILVA,L. H. S.
Este trabalho teve por objetivo apresentar a flora planctônica de um pequeno reservatório eutrófico, localizado no Sudeste brasileiro, baseado em amostras coletadas quinzenalmente durante o período de abril de 1988 a março de 1989 em uma estação localizada no centro da região limnética. Foram identificadas 93 espécies, 9 variedades, 5 formas taxonômicas e 9 táxons determinados em nível genérico -3 foram listados em suas respectivas classes, em um total de 119 táxons pertencentes a 9 classes taxônomicas (13 Cyanophyceae, 55 Chlorophyceae, 15 Zygnemaphyceae, 14 Euglenophyceae, 05 Bacillariophyceae, 3 Xanthophyceae, 6 Chrysophyceae, 4 Cryptophyceae e 4 Dinophyceae). Foi verificada uma considerável complexidade na composição florística, conforme registrado...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Composição florística; Fitoplâncton; Reservatório eutrófico.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200012

Comparative evaluation of the susceptibility of cultivated fishes to the natural infection with myxosporean parasites and tissue changes in the host
Provedor de dados: 57
Autores: MARTINS,M. L.; SOUZA,V. N. de; MORAES,J. R. E. de; MORAES,F. R. de; COSTA,A. J. da.
The purpose of the study was to evaluate the susceptibility of 4 important cultivated fishes to sporozoan parasites. Fishes were collected bimonthly from a pond for a period of 1 year. Myxobolus colossomatis and Henneguya piaractus were found in the internal organs and gills, respectively. The combined incidence of parasitism by both myxozoa was 97.3% in pacu (Piaractus mesopotamicus), 33.3% in hybrid tambacu (Piaractus mesopotamicus x Colossoma macropomum), 5.6% in tambaqui (Colossoma macropomum) and 0% in carp (Cyprinus carpio). Pacu was the most susceptible fish and was parasitized 79.2% in the gills, 66.7% in the kidney and 50% in the spleen. Histopathological evaluation of the gills showed hemorrhages, inflammatory reaction with mononuclear cells and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myxozoa; Susceptibility; Histopathology; Cultivated fish.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200010

Morphology and anatomy of developing fruits and seeds of Mammea americana L. (Clusiaceae)
Provedor de dados: 57
Autores: MOURÃO,K. S. M.; BELTRATI,C. M.
Morphological, structural and developmental features of fruits and seeds of Mammea americana L. are here studied, with the purpose to give a proper classification of their fruit and embryo type and to contribute to future taxonomical and ecological studies. The fruit is a berry and the "rind" consists of the exocarp, represented by a periderm with lenticels, and by the parenchymatic mesocarp, with branched secretory ducts and vascular bundles. The edible pulpy is formed by the endocarp, destituted of secretory ducts, and derived from the activity of a ventral meristem, which emerges early in the fruit development. The inner endocarp cell layers undergo a radial elongation and become firmly attached to the testal outer layers. At maturation the endocarp may...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clusiaceae; Fruit; Seed; Mammea; Anatomy.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400023

Porcellanid crabs (Crustacea, Decapoda) inhabiting sand reefs built by Phragmatopoma lapidosa (Polychaeta Sabellariidae) at Paranapuã beach , São Vicente, SP, Brazil
Provedor de dados: 57
Autores: MICHELETTI-FLORES,C.V.; NEGREIROS-FRANSOZO,M. L.
The purpose of this study is to survey the porcellanid crab fauna inhabiting Phragmatopoma lapidosa sand reefs at Paranapuã Beach, São Vicente (SP), Brazil, and to assess species diversity, density and spatial distribution at this locality. Monthly samples were carried out from September/94 to August/95 in three established sampling sites along the rocky shore. Five species of Porcellanidae were recorded: Pachycheles laevidactylus, P. monilifer, Petrolisthes armatus, Pisidia brasiliensis and Megalobrachium roseum comprising 9,084 specimens. The former four species were recorded in all sampling sites while the latter ocurred only in one. The highest relative density was showed by P. laevidactylus followed by P. armatus. Remaining species were present in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porcelain crabs; Species diversity; Sabellariid reefs.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100009

Histological processing techniques for the study of Dugesiidae development (Platyhelminthes, Tricladida, Paludicola)
Provedor de dados: 57
Autores: VARA,D. C. da; LEAL-ZANCHET,A. M.; LIZARDO-DAUDT,H. M.
The objective of the present study was to adapt techniques for the histological processing of Dugesiidae cocoons for the study of embryo development. The cocoons were fixed with formalin, SUSA, Bouin or paraformaldehyde/glutaraldehyde and subsequently embedded in Paraplast or glycol methacrylate (Historesin). Paraplast embedding yielded reasonable results only after the cocoon was perforated or fixed for a prolonged period of time using softening techniques with acid solutions. When the SUSA or Bouin fixative and Historesin embedding techniques were used the results were good for light microscopical analysis. Fixation with paraformaldehyde/glutaraldehyde and glycol methacrylate embedding resulted in better tissue preservation, and did not require prolonged...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embryo development; Techniques; Glycol methacrilate; Tricladida.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200019

Nesting behavior of the Picazuro Pigeon, Columba Picazuro (Columbidae, aves)
Provedor de dados: 57
Autores: ONIKI,Y.; WILLIS,E. O.
The Picazuro Pigeon nests in all months of the year in southeastern Brazil. Nest material is plucked from trees or ground and carried to build a frail and transparent nest of sticks where one egg is laid. Female and male alternate in incubation and brooding and do not soil the nest with feces.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nesting; Behavior; Columba picazuro; Columbidae; Aves.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400017

Histology of the trachea and lung of Siphonops annulatus (Amphibia, Gymnophiona)
Provedor de dados: 57
Autores: KUEHNE,B.; JUNQUEIRA,L. C. U.
The structure of the trachea and lung of Siphonops annulatus was studied in ten specimens of routinely fed animals. The trachea is constituted mainly by incomplete cartilage rings lined by a respiratory epithelium (ciliated and mucous cells) with variable morphology according to the region observed. A rich vascularization of this organ suggests its participation in blood-air gas exchange. The right lung in this species is developed and the left one is atrophied. This organ is constituted mainly by longitudinal septa formed by connective tissue, smooth muscle cells and blood capillaries. These structures are covered by pneumocytes of one type only, which present cytoplasmic particles that have been related with surfactant activity described in the lung of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gymnophiona; Siphonops; Trachea; Lung; Structure.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100019

Epithelial gill cells in the armored catfish, Hypostomus cf. plecostomus (Loricariidae)
Provedor de dados: 57
Autores: FERNANDES,M. N.; PERNA-MARTINS,S. A.
Epithelial gill cell morphology and distribution were investigated in the armored catfish, Hypostomus cf. plecostomus, which lives in soft ion-poor Brazilian freshwaters. Pavement cells are the most abundant type of cell on both filament and lamellar epithelia and there are a great number of mucous and chloride cells between them. Mucous cells are almost covered by adjacent pavement cells and have large packed granules showing electrondense differences. No mucous cells were found on the lamellar epithelium. Chloride cell were distributed throughout both epithelia and usually have large apical surface facing the external medium and may exhibit short and sparsely distributed microvilli. The presence of chloride cells on the lamellar epithelium may be an...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gills; Epithelium; Teleost; Loricariid; Hypostomus cf. plecostomus.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100010

Variação espacial e temporal de bagres marinhos (Siluriformes, Ariidae) na Baía de Sepetiba, Rio de Janeiro
Provedor de dados: 57
Autores: AZEVEDO,M. C. C.; ARAÚJO,F. G.; CRUZ-FILHO,A. G.; GOMES,I. D.; PESSANHA,A. L. M.
Bagres marinhos (Ariidae) são os mais abundantes recursos pesqueiros em arrastos de fundo na Baía de Sepetiba, RJ (Lat. 22º54’-23º04’S; Long. 43º34’-44º10’W), que é uma importante área de criação e alimentação de uma grande variedade de espécies de peixes na fase juvenil. Padrões espaciais e sazonais de distribuição dos bagres marinhos, baseados no número e no peso de peixes por arrasto, foram analisados com base em 151 amostragens de arrasto de fundo, em sete locais da Baía de Sepetiba, entre julho de 1993 e junho de 1996. Para comparações espaciais da área de estudo, estabeleceu-se como zona interna a região situada no interior da Baía e como zona externa a área com maior influência das águas oceânicas. Juntamente com os arrastos de fundo, foram feitas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bagres marinhos; Ariidae; Baía de Sepetiba; Distribuição.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300009

Prediction of colonization by macrophytes in the Yaciretá reservoir of the Paraná River (Argentina and Paraguay)
Provedor de dados: 57
Autores: NEIFF,J. J.; POI DE NEIFF,A. S. G.; PATIÑO,C. A. E.; BASTERRA DE CHIOZZI,I.
The potential colonization by anchored plants (PCAP) and the potential areas for initial colonization of free floating plants were estimated during the early filling phase for the Yaciretá reservoir. In order to obtain the PCAP, the observed maximum depth of colonization of the anchored macrophytes before impoundment and the hypsographic curves were used. The species inhabiting the pre-impoundment area were classified according to the different bioforms before the inclussion in the analysis. The areal extent of PCAP (from depths between 0-4 m) could reach 275 km² at 76 m above sea level (current water level), whereas at 82 m above sea level (final filling level) the littoral zone will be increased by about 21.5%. The potential area for geophytes was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical rivers; Impounding reservoirs; South America; Potential macrophytes colonization; Reservoirs.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400011

Biology of Corecoris dentiventris Berg, 1884 (Hemiptera, Coreidae) in tobacco culture (Nicotiana tabacum)
Provedor de dados: 57
Autores: CALDAS,B.-H. C.; REDAELLI,L. R.; DIEFENBACH,L. M. G.
Corecoris dentiventris Berg, 1884 (HEM., Coreidae) represents a pest in the tobacco culture in Southern Brazil. Nymphs and adults cause the wilting and twisting of the tobacco leaves due to their sucking habit. There are very few works about this species and these are restricted to concise description of the adult morphology, records of host plants and enumeration of injuries. The present investigation aims to study the life cycle of this bug. The experiment was carried out in a tobacco culture (Virginia type, var. K 326) implanted in the experimental area of the Departamento de Fitossanidade of the Universidade Federal do Rio Grande do Sul, in Porto Alegre, RS. The life cycle was studied in field conditions, in nylon cages, from egg clusters oviposited by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corecoris dentiventris; Life cycle; Tobacco.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100020

Distribuição das larvas de Mylossoma aureum e M. duriventre (Pisces: Serrasalmidae) nas margens do rio Solimões, AM
Provedor de dados: 57
Autores: OLIVEIRA,EDINBERG CALDAS DE; ARAUJO-LIMA,CARLOS A. R. M.
A distribuição das larvas de Mylossoma aureum e M. duriventre (Pisces: Serrasalmidae) foi estudada em um trecho de aproximadamente 60 km do rio Solimões durante dois anos (19951996). Foi analisada a distribuição vertical e por hábitats. Os hábitats estudados foram praias (áreas de sedimentação), barrancos (áreas de erosão), canais de lagos e foz de canais (áreas de ligação). Apenas larvas próximas ao estádio de primeira alimentação exógena foram encontradas derivando no rio. A distribuição de larvas entre hábitats não foi homogênea. A menor abundância de larvas das duas espécies foi registrada nas praias, e as maiores abundâncias ocorreram nos barrancos e foz de canais. As abundâncias de larvas nos canais de lago foram iguais às da foz para M. aureum, mas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazônia; Peixe; Larva; Distribuição espacial; Characiformes.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300002

Reproductive behavior and seasonal occurrence of Psecas viridipurpureus (Salticidae, Araneae)
Provedor de dados: 57
Autores: ROSSA-FERES,D. de C.; ROMERO,G. Q.; GONÇALVES-DE- FREITAS,E.; FERES,R. J. F.
The reproductive behavior and the seasonal occurrence of Psecas viridipurpureus were studied at the Estação Ecológica do Noroeste Paulista, a small conservation area in the northwest region of São Paulo State, Brazil (49°22'50''W and 20°48'36''S). P. viridipurpureus occurred on "gravatá", a bromeliaceous plant (Bromelia balansae, Bromeliaceae) which does not accumulate rain water. During the courtship display the couple occupied the median region of the "gravatá" leaves, with the male always located in a higher position than the female. The males of P. viridipurpureus showed a complex courtship behavior, which included five motor patterns. The courtship and mating behavior occurred preponderantly during the rainy season and the juvenile recruitment between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seasonal occurrence; Courtship behavior; Reproductive biology; Salticidae; Psecas viridipurpureus.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200005

Reprodutive ecology of the blue crab, Callinectes danae Smith, 1869 in the Conceição Lagoon system, Santa Catarina Isle, Brazil
Provedor de dados: 57
Autores: BRANCO,J. O.; MASUNARI,S.
Abundance of ovigerous females, size of the first gonadal maturation and the possible migration, route of the blue crab Callinectes danae from the Conceição Lagoon system, Santa Catarina Isle, Brazil, are described. This lagoon is connected with the coastal area through a canal. A total of 1,124 crabs was caught during a 19 month sampling period. The reproduction and recruitment of juveniles occurred all year-round, with two peaks of abundance (February and September), correlated with the presence of ovigerous females (June and January). The mean carapace width at which the crabs attained gonadal maturity for the first time was 9.4 cm in males and 8.4 cm in females. The Conceição Lagoon is a growth, reproduction, and spawning area for the species. However,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Callinectes danae; Reproductive ecology; Portunidae.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100004

Mercury content in shark species from the South-Eastern Brazilian coast
Provedor de dados: 57
Autores: LACERDA,L. D.; PARAQUETTI,H. H. M.; MARINS,R. V.; REZENDE,C. E.; ZALMON,I .R.; GOMES,M. P.; FARIAS,V.
We present here the first results of Hg concentrations in three small shark species (Rhizoprionodon lalandei, R. porosus and Mustelus higmani) from the SE Brazilian coast. Mercury concentrations in R. lalandei ranged from 21.5 to 280.0 ng.g-1 dry weight (d.w.) (average 74.6 ng.g-1 d.w.; 17.9 ng.g-1 wet weight). In R. porosus, concentrations ranged from 7.6 to 90.5 ng.g-1 d.w. (average 42.2 ng.g-1 d.w., 9.4 ng.g-1 wet weight), whereas in M. higmani, concentrations ranged from 13.0 to 162.8 ng.g-1 d.w. (average 54.9 ng.g-1 d.w., 13.4 ng.g-1 wet weight). These concentration ranges are very low compared with values reported for other large shark species of the Southwestern Atlantic Ocean. There was a significant positive correlation between Hg concentrations...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mercury; Sharks; Biomagnification; SE Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400005

Feeding biology of a guild of benthivorous fishes in a sandy shore on south-eastern Brazilian coast
Provedor de dados: 57
Autores: ZAHORCSAK,P.; SILVANO,R. A. M.; SAZIMA,I.
The feeding biology of eight species of benthivorous fishes was studied in a sandy shore at Anchieta Island, south-eastern Brazilian coast. The fishes fed mainly on Amphipoda and Mysidacea crustaceans. The diet of the most abundant species, the drum Umbrina coroides, was analyzed in three standard length classes (20-55, 56-90 and 91-135 mm). This sciaenid showed an ontogenetic diet shift from Mysidacea to Amphipoda. The feeding behaviour of the sciaenid U. coroides and the gerreid Eucinostomus gula was recorded while snorkeling. During their foraging both species uncovered small organisms buried in the sand. Notwithstanding general similarities in diet, U. coroides and E. gula presented differences in feeding behaviour and morphology. Two carangid species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Marine fishes; Ontogenetic diet shift; Umbrina coroides; Eucinostomus gula.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300016

Patterns of gall-forming in Ossaea confertiflora (Melastomataceae) by Lopesia brasiliensis (Diptera: Cecidomyiidae) in an area of Atlantic Rainforest in Southeastern Brazil
Provedor de dados: 57
Autores: VRCIBRADIC,D.; ROCHA,C. F. D.; MONTEIRO,R. F.
Patterns of galling by the gall midge Lopesia brasiliensis (Diptera: Cecidomyiidae) were studied in Ossaea confertiflora (Melastomataceae) in an Atlantic forest site at Ilha Grande, RJ. Out of the 81 plants surveyed, 55 (67.9%) bore galls. The number of galls per galled individual ranged from 1 to 261 and 94.4% of the galls were in leaves. The number of galls per galled leaf varied from 1 to 25. Total gall number was positively correlated with plant height. Larger and more ramified plants tended to have a smaller percentage of their leaves with galls and a lower density of galls per leaf than smaller plants. Plants that were close to other individuals of the same species tended to have more galls per leaf than relatively isolated plants. The observed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cecidomyiidae; Ilha Grande; Leaf galls; Lopesia brasiliensis; Ossaea confertiflora.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100018

Food resource utilization of the skates Rioraja agassizii (Müller &amp;amp; Henle, 1841) and Psammobatis extenta (Garman, 1913) on the continental shelf off Ubatuba, South-eastern Brazil
Provedor de dados: 57
Autores: MUTO,E. Y.; SOARES,L. S. H.; GOITEIN,R.
The feeding habits of Rioraja agassizii (syn. Raja agassizii) and Psammobatis extenta (syn. Psammobatis glansdissimilis) of the South-eastern Brazilian coast were studied by means of stomach content analysis. The samples were obtained on eight seasonal oceanographic cruises, carried out between October 1985 and July 1987. The importance of each food item was evaluated on the basis of the Index of Relative Importance and the feeding similarity by Percentage of Similarity. The results indicated that both species are benthic feeders, preying mainly on Crustacea, especially Amphipoda, Caridea and Brachyura. Teleostei were also important for R. agassizii. Seasonal variation of the diet seems to be associated with the availability of the prey, whose distribution...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rajidae; Stomach content; Feeding habits; South Atlantic; Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200005

New record of planktonic cladoceran to the upper Paraná River, Brazil: Bosmina huaroensis Delachaux, 1918
Provedor de dados: 57
Autores: VELHO,L. F. M.; LANSAC-TÔHA,F. A.; BONECKER,C. C.
In this paper we register the first occurrence of Bosmina huaroensis Delachaux, 1918 in the upper Paraná River basin, which is probably the first record to Brazil. Illustrations and an updated description of the species are given.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zooplankton; Cladocera; Taxonomy; Bosmina huaroensis; Itaipu reservoir.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400013

Estrutura e dinâmica de populações arbóreas de um fragmento de floresta estacional semidecidual na região de Piracicaba, SP
Provedor de dados: 57
Autores: NASCIMENTO,H. E. M.; DIAS,A. DA S.; TABANEZ,A. A. J.; VIANA,V. M.
Para verificar a hipótese de que a fragmentação das florestas tropicais associada às perturbações antrópicas podem resultar numa maior perda de espécies arbóreas e na mudança na composição florística ao longo do tempo foi analisado um fragmento de floresta estacional semidecidual de 9,5 ha localizado na região de Piracicaba, Estado de São Paulo, onde houve dois incêndios em passado recente. Neste fragmento, denominado de Mata do Pomar, o recrutamento, a mortalidade e a mudança do tamanho populacional de espécies arbóreas foram obtidos num intervalo de quatro anos (1991 e 1995). Padrões de recrutamento, mortalidade e conseqüente mudança populacional variaram entre as espécies e os grupos ecológicos. As dez espécies mais abundantes no ano de 1991, que...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fragmentos florestais; Floresta estacional semidecidual; Dinâmica; Perturbações antrópicas; Conservação.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200015

Ichthyouris voltagrandensis n.sp. (Nematoda: Pharyngodonidae) from Myleus tiete Eigenmann &amp;amp; Norris, 1900 (Osteichthyes: Characidae) in the Volta Grande Reservoir, MG, Brazil
Provedor de dados: 57
Autores: MARTINS,M. L.; YOSHITOSHI,E. R.; UMEKITA,H.
The present work studied helminth parasites of "pacu-manteiga", Myleus tiete (Osteichthyes: Characidae) from Volta Grande Reservoir, MG, Brazil. Fishes with 142.6 ± 24.7 g weight and 17.3 ± 1.0 cm total length were collected. Five out six analysed fish (prevalence 83.3%) were parasitized in the intestine with an average of 535.6 ± 334.6 oxyurid nematodes per fish. The helminth was identified as Ichthyouris voltagrandensis n.sp. (Nematoda: Pharyngodonidae). It differs from I. brasiliensis (Moravec et al., 1992a) by the absence of lateral alae, higher measures of tail and caudal alae of males, esophageal isthmus length, distance of excretory pore from anterior end and spicule length. In addition, eggs were provided by two long filaments in just one pole and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nematoda; Pharyngodonidae; Ichthyouris voltagrandensis n.sp.; Myleus tiete.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200013

Flight activity and colony strength in the stingless bee Melipona bicolor bicolor (Apidae, Meliponinae)
Provedor de dados: 57
Autores: HILÁRIO,S. D.; IMPERATRIZ-FONSECA,V. L.; KLEINERT,A. de M. P.
Flight activity of Melipona bicolor bicolor, coming from Cunha (23º05'S, 44º55'W), Atlantic Forest, was studied in ten colonies, and in two periods: from July to September 1993 and from August to September 1995. The colonies were grouped in weak, medium and strong, according to the diameter of the combs, which can provide a good idea of the number of cells built. 855 observations were accomplished for 5 minutes, every half-hour, from 8 to 18 hours. The total number of bees that entered and left the hive and the number of bees that arrived with mud, pollen and resin, besides the number that went out with debris in that period were counted. It was also registered the temperature and the relative humidity of the air. The total external activity, as well as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stingless bees; Flight activity; Climate conditions; Resource collection.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200014

Sandflies (Diptera: Psychodidae) of the Amazônia of Maranhão. V. Seasonal occurrence in ancient colonization area and endemic for cutaneous leishmaniasis
Provedor de dados: 57
Autores: REBÊLO,J. M. M.; OLIVEIRA,S. T. de; SILVA,F. S.; BARROS,V. L. L.; COSTA,J. M. L.
In this paper, the seasonal abundance of 25 sandfly species (1 of the Brumptomyia genus and 24 of the Lutzomyia genus) found at P1V5, municipal district of Buriticupu, Maranhão State, is discussed. The capture was carried out from 18:00 P.M. to 6:00 A.M., once a month, from January to December 1996. CDC light traps were set up in the forest, in the peri and intradomicile environments. Five species were only found in the rainy season (January to June), being represented by one or two individuals; eight species occurred only in the dry season (July to December) and eleven species appeared in both seasons. The most frequent species in the dry period were: L. whitmani (26.3%), L. serrana (23%), L. choti (22.8%), L. evandroi (7.5%), L. longipalpis (5.8%), L....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phlebotominae; Lutzomyia; Leishmaniasis; Amazônia of Maranhão.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100014

Gastrointestinal parasites and prey items from a mass stranding of false killer whales, Pseudorca crassidens, in Rio Grande do Sul, Southern Brazil
Provedor de dados: 57
Autores: ANDRADE,A. L. V.; PINEDO,M. C.; BARRETO,A. S.
The gastrointestinal tract of 14 false killer whales, 6 males and 8 females, stranded in June 1995 in southern Brazil, with total standard lengths from 338 to 507 cm, were analysed for endoparasites and food items. A pregnant female had a male foetus of 77.5 cm. Parasites were found in all 14 false killer whales. The nematode Anisakis simplex (Rudolphi, 1809) was found in the stomach of 57% of the animals and the acanthocephalan Bolbosoma capitatum (Linstow, 1889) Porta, 1908 was present in the intestine of all specimens and showed densities up to 600 m-1. An unidentified cestode (Tethrabothridae) was found also in the intestines of 14% of the individuals. The high infections of B. capitatum and A. simplex were not directly related with the cause of death....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parasites; Food items; Pseudorca crassidens; Mass stranding.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100008

Biodiversity assessment of benthic macroinvertebrates in altitudinal lotic ecosystems of Serra do Cipó (MG, Brazil)
Provedor de dados: 57
Autores: GALDEAN,N.; CALLISTO,M.; BARBOSA,F. A. R.
Five lotic systems of Serra do Cipó, south-east Brazil, were investigated in order to assess the existing diversity of benthic macroinvertebrates, habitats-microhabitats, and the available trophic resources. For each river it was analysed the communities of benthic macroinvertebrates and the composition of some taxonomic groups (Plecoptera, Ephemeroptera, Trichoptera and Diptera Chironomidae): the community with Bivalvia Sphaeriidae, Oligochaeta and Ephemeroptera Baetidae (being supposed a closed relation Bivalvia-Oligochaeta based on the process of bioturbation and enrichment of sediment in organic matter) in Tanque River; the macrofauna associated to aquatic macrophytes from rivers Peixe and Preto do Itambé reflecting the reaction of the ecosystems...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macroinvertebrates; River ecology; Ephemeroptera; Trichoptera; Chironomidae.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200006

Morphology and anatomy of developing fruits and seeds of Vismia guianensis (Aubl.) Choisy (Clusiaceae)
Provedor de dados: 57
Autores: MOURÃO,K. S. M.; BELTRATI,C. M.
Morphological, structural and developmental features of fruits and seeds of Vismia guianensis (Aubl.) Choisy. are here presented, with the purpose to elucidate their structure and to contribute to taxonomical and ecological studies of the family. The fruit is a berry and the "rind" is constituted by the exocarp and by the subepidermal layers which constitute the mesocarp. The reddish pulp, rich in starch, is constituted by the parenchymatic mesocarp, with branched secretory ducts and vascular bundles, joined with the endocarp, which arises from a ventral meristem. The bitegmic, anatropous ovules, provided by the endothelium, develop into anatropous, bitegmic and exalbuminous seeds. The reddish uniseriate testa shows phenolic contents. The tegmen becomes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clusiaceae; Fruit; Seed; Vismia; Anatomy.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100019

Monochromatic and polychromatic visual backgrounds influence the response of area 17 and 18 neurons after stimulation with stationary and moving light bars
Provedor de dados: 57
Autores: KOCH,H. J.
The role of colour vision in night-active cats has not been elucidated completely hitherto. In order to assess the colour sensitivity in cat cortical neurons we used large isoluminant computer-generated monochromatic and polychromatic background stimuli which were superimposed on moving and stationary (on/off) light bars. Background stimuli were moved at different speeds either inphase or antiphase. The modulatory effect of the visual noise on the neuronal bar was the primary objective of the study. The maximum amplitudes of some 40% of the neurons tested was influenced by both moving and stationary bars. About two thirds of amplitude-sensitive cells showed aldo altered direction selectivity. Latencies and field widths, on the other hand, turned out to be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colour vison; Cat; Monochromatic and polychromatic visual noise.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200018

Avaliação do efeito da serotonina (5-HT) e da monoablação do pedúnculo ocular na indução da maturação ovariana de Penaeus penicillatus (Alcock, 1905)
Provedor de dados: 57
Autores: OLIVEIRA,P. S. P.; CORRÊA,A. M. A.
O efeito da serotonina e da monoablação do pedúnculo ocular na indução do desenvolvimento gonadal de Penaeus penicillatus (camarão do rabo vermelho) foi investigado. Fêmeas imaturas com peso médio de 20 g foram selecionadas e distribuídas de maneira aleatória em quatro grupos de 5 animais com uma réplica para cada grupo: grupo controle inicial (CI), sacrificado no 1º dia do experimento; grupo controle paralelo (GC), injetado com 0,05 ml de solução salina; grupo monoablado (GA), submetido à monoablação no dia 0 e injetado com 0,05 ml de solução salina logo após a monoablação e no 5º dia; grupo serotonina (GS), injetado com 0,05 ml de serotonina dissolvida em solução salina no dia 0 e 5º dia, numa dose total de 15 mg por grama de peso do animal (7,74 x 10-7...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Penaeus sp.; Serotonina; 5-HT; Reprodução; Maturação ovariana.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200017

Phytoplankton community of a polymictic reservoir, La Plata River basin, Uruguay
Provedor de dados: 57
Autores: PÉREZ,M. C.; BONILLA,S.; MARTÍNEZ,G.
This paper deals with the analysis of phytoplankton composition and abundance from four sampling stations at the polymictic system, Rincón del Bonete water reservoir in Uruguay. Sampling data were obtained in 4 seasonal periods between February and November 1993. A hundred and twenty-four taxa were identified, where Aulacoseira granulata (Ehrenb.) Simon., A. granulata var. angustissima (Muller) Simon., A. granulata var. angustissima f. spiralis, (Muller) Simon., A. cf. ambigua, (Grun.) Simon., A. cf.. distans (Ehrenb.) Simon., Cryptomonas spp. and Synedra ulna (Nitzsch) Ehrenberg, were always present. Phytoplankton abundance fluctuated between 29 (autumn) and 2129 (summer) ind/ml. The general dominance of Aulacoseira spp. could be related to the polymictic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microalgae; Freshwater; Artificial lakes; Aulacoseira; Uruguay.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400002

Crescimento de órgãos do aparelho reprodutor durante o desenvolvimento de Biomphalaria tenagophila (Orbigny) (Mollusca, Planorbidae)
Provedor de dados: 57
Autores: MONTEIRO,W.; KAWANO,T.
Biomphalaria tenagophila é um hermafrodita simultâneo cujo investimento na função masculina foi avaliado pelo crescimento de seus órgãos sexuais em relação ao diâmetro da concha. Foram criadas novas técnicas para medir órgãos reprodutivos, sem aparentes distorções, e contar folículos do ovoteste. Durante o crescimento de espécimes sexualmente maduros de B. tenagophila, cresceu o número de folículos do ovoteste, mas seus números máximos e mínimos são menores do que os citados na literatura. O número de divertículos da próstata e de folículos do ovoteste de B. glabrata é maior do que o de B. tenagophila. Embora o comprimento do ovoteste, da próstata, da bainha do pênis e da glândula mucípara-ootecal variassem durante o crescimento do caramujo, não variou...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomphalaria tenagophila; Crescimento; Aparelho reprodutor.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400017

Regression equations between body and head measurements in the broad-snouted caiman (Caiman latirostris)
Provedor de dados: 57
Autores: VERDADE,L. M.
In the present study, regression equations between body and head length measurements for the broad-snouted caiman (Caiman latirostris) are presented. Age and sex are discussed as sources of variation for allometric models. Four body-length, fourteen head-length, and ten ratio variables were taken from wild and captive animals. With the exception of body mass, log-transformation did not improve the regression equations. Besides helping to estimate body-size from head dimensions, the regression equations stressed skull shape changes during the ontogenetic process. All age-dependent variables are also size-dependent (and consequently dependent on growth rate), which is possibly related to the difficulty in predicting age of crocodilians based on single...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Relative growth; Sexual dimorphism; Size estimates; Broad-snouted caiman; Caiman latirostris.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300012

Estrutura da comunidade de peixes demersais da baía de Sepetiba, RJ
Provedor de dados: 57
Autores: ARAÚJO,FRANCISCO GERSON; CRUZ-FILHO,ANTÔNIO GOMES DA; AZEVÊDO,MÁRCIA CRISTINA COSTA DE; SANTOS,ALEXANDRE CLÍSTENES DE ALCÂNTARA.
Um programa de amostragens mensais de arrasto de fundo em sete estações de coleta na Baía de Sepetiba foi realizado entre julho de 1993 e junho de 1994 com o objetivo de descrever a estrutura da comunidade de peixes e suas variações espaciais e temporais. Noventa e sete espécies de peixes foram levantadas, compreendendo 70 gêneros e 38 famílias. As famílias Ariidae, Gerreidae, Sciaenidae, Carangidae e Sparidae, nesta ordem, foram as mais abundantes em número, contribuindo com 69,9% do total capturado, enquanto Ariidae, Sparidae, Gerreidae, Haemulidae e Sciaenidae somaram 67,9% do peso total. Genidens genidens, Gerres aprion, Cathorops spixii, Micropogonias furnieri e Chloroscombrus chrysurus, nesta ordem, foram as espécies mais abundantes, contribuindo...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Baía de Sepetiba; Ictiofauna; Lagoas costeiras; Peixes; Comunidade.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300007

Ecologia de Tropidurus torquatus (Sauria: Tropiduridae) da Restinga de Guriri, São Mateus, ES
Provedor de dados: 57
Autores: TEIXEIRA,R. L.; GIOVANELLI,M.
Aspectos da ecologia de Tropidurus torquatus foram estudados mensalmente na restinga de Guriri, São Mateus, Norte do Espírito Santo, de fevereiro de 1996 a março de 1997. Foram coletados 108 exemplares com arma de pressão, sendo 45 machos, 56 fêmeas e 7 exemplares cujo sexo não foi identificado. O comprimento rostro-anal no total dos exemplares variou de 26,0 a 101,8 mm (média = 61,7 mm; DP = 15,1). O peso no total dos exemplares variou de 0,8 a 39,6 g (média = 14,6 g; DP = 10,4). Em freqüência de ocorrência, os itens alimentares que predominaram na dieta de T. torquatus foram as formigas (85,7%), coleópteros (32,4%), abelhas (31,4%), cupins (22,8%), aranhas (20,9) e flores (20,0%). Em relação à freqüência numérica, os itens alimentares que predominaram...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sauria; Tropiduridae; Tropidurus torquatus; Ecossistema costeiro; Alimentação; Razão sexual; Restinga.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100002

Nota editorial
Provedor de dados: 57
Tipo: Info:eu-repo/semantics/other
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300001

Dufour glands in the hymenopterans (Apidae, Formicidae, Vespidae): a review
Provedor de dados: 57
Autores: ABDALLA,F. C.; CRUZ-LANDIM,C. da.
Associated to the sting apparatus of the aculeate hymenopterans is found the poison gland, originated from the glands associated to the ovipositor of the non-aculeate hymenopterans and the less derived Dufour gland, homologue of the coletterial gland of other insects, and found in all hymenopteran females. The Dufour gland functions is mostly uncertain in hymenopterans but in ants it is involved with communication and defense and in non social bees with the nest building and protection. In wasps possibly with kin-recognition. Differences in morphology and chemical composition of the gland secretion were observed among species, in the same species, between the castes in the social species and among individual of the same caste playing different tasks or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dufour gland; Hymenopterans; Morphology; Pheromones; Ultrastructure.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100013

Fern spore bank at Pedregulho (Itirapina, São Paulo, Brazil)
Provedor de dados: 57
Autores: SIMABUKURO,E. A.; BEGOVACZ,A.; ESTEVES,L. M.; FELIPPE,G. M.
This paper presents an analysis of pteridophyte spore bank the site of Pedregulho, in Itirapina, state of São Paulo, Brazil. The samples of soil were collected in February (rainy season) and August (dry season) in four localities: open cerrado, cerradão, gallery forest and a disturbed area at depths of 0-5, 5-10 and 10-15 cm. The samples were collected in duplicate. Of the duplicates, one was used for spore counting and the second one for spore germination. In the cerrado, cerradão and gallery forest soil samples the values for pteridophyte spores were similar in the rainy and dry season, but in the disturbed area the percentage of spores was higher in the rainy season than in the dry season. The number of pteridophyte spores decreased with soil depth in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fern spore bank; Gametophytes; Cerrado; Cerradão; Gallery forest; Brazil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100017

Biologia dos adultos de Methona themisto (Hübner, 1818) (Lepidoptera, Nymphalidae, Ithomiinae) em praças públicas de Uberlândia, Minas Gerais, Brasil
Provedor de dados: 57
Autores: RUSZCZYK,A.; NASCIMENTO,E. S.
No período de abril de 1992 a setembro de 1993, os adultos de Methona themisto (Hübn.) foram semanalmente marcados e recapturados em duas praças centrais de Uberlância (MG). Dos 637 indivíduos marcados nas duas praças, um terço era fêmea. Aproximadamente 10% dos indivíduos foram recapturados, sendo de 62 dias o máximo tempo de residência registrado. A presença da planta hospedeira das larvas (Brunfelsia uniflora, (Pohl) D. Don, Solanaceae) em uma das praças proporcionou maior abundância do lepidóptero ao longo da pesquisa, maiores porcentagens de indivíduos novos e maior freqüência de migrantes do que a outra praça pesquisada, que não continha a planta hospedeira. Methona themisto manteve-se ativa no estágio adulto durante todo o período de amostragem com...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lepidoptera; Methona themisto; Hábitat urbano; Marcação e recaptura; Conservação de insetos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400007

Conteúdo estomacal da albacora-laje, Thunnus albacares, durante o inverno e primavera no sul do Brasil
Provedor de dados: 57
Autores: VASKE Jr,T.; CASTELLO,J. P.
Conteúdos estomacais da albacora-laje, capturada com espinhel no sul do Brasil, foram estudados a partir de 178 exemplares coletados durante o inverno e primavera entre agosto de 1988 e outubro de 1990. Os resultados apresentados na forma de listas de presas e representações gráficas de IRI (Índice de Importância Relativa) mostraram variações na composição da dieta para as duas estações. Teleósteos e a lula Ornithoteuthis antillarum predominaram na dieta de inverno, ao passo que na primavera os anfípodes hiperídeos Brachyscelus crusculum e Phrosina semilunata foram os itens mais importantes. A albacora-laje caracterizou-se como um predador eurifágico, que não faz distinção de tipo ou tamanho das presas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Albacora-laje; Conteúdo estomacal.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400011

Characterization of the fishes and of subsistence fishing in the Pantanal of Mato Grosso, Brazil
Provedor de dados: 57
Autores: OLIVEIRA,R. D. de; NOGUEIRA,F. M. de B.
Fishing is one of the oldest human activities in the Pantanal of Mato Grosso in Central Brazil. In the of Bento Gomes River Basin (Pantanal of Poconé) the presence of fishermen is very common. The objective of this study is to describe the fishing activity in the basin in view of the elaboration of proposals for the sustainable use of this natural resource. Of the 256 fishermen that were registered most are fishing for their subsistence (92%) and the rest (8%) are occasional fishermen (locally called "de lufada" fishermen). "Traíra" (Hoplias gr. malabaricus) and "piranhas" (Serrasalmus marginatus, Serrasalmus spilopleura and Pygocentrus nattereri) were the species most frequently captured for human consumption. The fishing is more intensive during the ebb...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pantanal of Mato Grosso; Fish; Subsistence fishing.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300008

Conservation value of a native forest fragment in a region of extensive agriculture
Provedor de dados: 57
Autores: CHIARELLO,A. G.
A survey of mammals and birds was carried out in a semi-deciduous forest fragment of 150 ha located in a zone of intensive agriculture in Ribeirão Preto, State of São Paulo, south-eastern Brazil. Line transect sampling was used to census mammals and birds during six days, totalling 27.8 km of trails and 27.8 hours of observation. Twenty mammal species were confirmed in the area (except bats and small mammals), including rare or endangered species, such as the mountain lion (Puma concolor), the maned wolf (Chrysocyon brachyurus), and the ocelot (Leopardus pardalis). The brown capuchin monkey (Cebus apella) and the black-tufted-ear marmoset (Callithrix penicillata) were found frequently, suggesting high population density in the fragment. Regarding the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Avifauna; Conservation; Fragmentation; Mammals; São Paulo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200007

Editorial note
Provedor de dados: 57
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400001

Conteúdo estomacal dos tubarões azul (Prinace glauca) e anequim (Isurus oxyrinchus) em águas oceânicas no sul do Brasil
Provedor de dados: 57
Autores: VASKE-JÚNIOR,TEODORO; RINCÓN-FILHO,GETÚLIO.
Os tubarões azul e anequim são as duas principais espécies de elasmobrânquios pelágicos que foram capturadas com freqüência pelos barcos atuneiros nacionais que operaram no sul do Brasil durante o segundo e terceiro trimestres, e que utilizam o espinhel como arte de pesca. Foram coletados 68 estômagos de tubarão azul e 32 estômagos de anequim entre agosto de 1990 e junho de 1991. Os resultados das análises dos conteúdos são apresentados na forma de diagramas IRI (Índice de Relativa Importância) mostrando que há melhor representatividade entre as porcentagens de IRI quando a análise desconsidera bicos isolados de cefalópodes. Os 31 taxa identificados são apresentados em listagem taxonômica, dos quais 25 em nível de gênero e 17 em nível de espécie. O tubarão...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Conteúdo estomacal; Tubarão azul; Tubarão anequim.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300009

Variaciones espaciales y temporales del fitoplancton en un lago subtropical de Argentina
Provedor de dados: 57
Autores: ZALOCAR DE DOMITROVIC,YOLANDA; ASSELBORN,VIVIANA M.; CASCO,SYLVINA L.
Species composition, biomass and diversity of the phytoplankton in a subtropical lake (27°29'S; 58°45'W) were studied from February 1995 to March 1996. One or two samples were taken monthly in the limnetic and the littoral area. Cell counts were done by the Utermöhl method (1958). Phytoplankton biomass varied among 2.38 and 45.59 mm³.m-2 with a mean value of 12.11 (±10.52) mm³.m-2. The population density oscillated among 0.3x10(6) and 4.7x10(6) ind.cm-2. Cyanophyta was the dominant group all the year contributing among 25% and 83% of the total biomass. Cylindrospermopsis raciborskii, Aphanizomenon sp. and Microcystis aeruginosa were the dominant species. The Chlorophyta, second group in importance, contributed among 8% and 50% being Botryococcus braunii...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Subtropical lake; Phytoplankton; Composition; Biomass; Diversity.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300003

Comparative phytosociology of tree sinusiae between contiguous forests in different stages of succession
Provedor de dados: 57
Autores: CAVALCANTE,A. DE M. B.; SOARES,J. J.; FIGUEIREDO,M. A.
The Baturité Mountain Range, located in the State of Ceará (BRA), displays on its highest levels a vegetation viewed as a disjunction from the Atlantic Forest in the East of Brazil. Among the various attributes associated with this vegetation, the abundance of water resources and a high biodiversity have a more outstanding relevance. However, in view of the current accelerated deforestation process, those attributes may be threatened in a near future. Therefore, the present work is a comparative study with its focus on vegetal community organization (tree sinusiae) and the floristic similarity and the phytodiversity of two areas in different successive stages, preserved and deforested 24 years ago. The aim of that intent was to obtain information that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tropical forest; Phytosociology; Vegetation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400003

Home range of a Geoffroy's marmoset group, Callithrix geoffroyi (Primates, Callitrichidae) in South-eastern Brazil
Provedor de dados: 57
Autores: PASSAMANI,M.; RYLANDS,A. B.
The home range of one group of the Geoffroy's marmoset (Callithrix geoffroyi) was studied in a fragment of the Atlantic Forest in south-eastern Brazil, between February 1993 and January 1994. The total home range was 23.3 ha and the area used in the dry season was significantly larger than that of the wet season. The smallest distance travelled by group was 480 m/day in May and the longest was 1,980 m/day in March, but with no significant differences between seasons. The total home range used for this species agrees with the ecological grouping of the genus Callithrix proposed by Rylands &amp;amp; Faria (1993) and may be associated with the habitat structure, the limit of the fragment and the inexistence of neighbouring groups.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Primates; Home range; Geoffroy's marmoset; Callithrix geoffroyi; Atlantic Forest.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200011

Ontogenetic patterns and genetic variation in Anopheles (Anopheles) intermedius Chagas, 1908 and Anopheles (Anopheles) mattogrossensis Lutz &amp;amp; Neiva, 1911 (Diptera: Culicidae) in the Brazilian Amazon
Provedor de dados: 57
Autores: RODRIGUEZ,G. A. D.; SANTOS,J. M. M. dos; MAIA,J. de F.
Changes in the expression of genes were observed during development in populations of Anopheles (Anopheles) intermedius and Anopheles (Anopheles) mattogrossensis. Esterase showed seven zones of activity: EST1 was present in all developmental stages of both species; EST2 was observed only in larvae of A. intermedius and larvae and pupae of A. mattogrossensis, with greater activity in pupae; EST3 and EST5 were present in all developmental stages, with greater intensity in larvae; EST4 and EST6 showed weak activity in larvae of A. mattogrossensis and was not found in A. intermedius. Leucine aminopeptidase showed four zones of activity, of which LAP1 and LAP2 were found in all stages of A. intermedius, with highest activity in larvae, and in larvae only of A....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anopheles intermedius; Anopheles mattogrossensis; Ontogeny; Isozymes; Malaria.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200020

Effect of temperature on oviposition in four species of the melanogaster group of Drosophila
Provedor de dados: 57
Autores: SRIVASTAVA,TULIKA; SINGH,B. N.
Experiments were conducted to test the effect of temperature on oviposition in four species of the melanogaster group of Drosophila: D. ananassae, D. bipectinata, D. malerkotliana and D. biarmipes. In each species, two wild strains were used and eggs laid by females at three different temperatures (19°C, 24°C and 30°C) were counted for four days at 24 h interval. It is evident from the results that females of D. ananassae, D. bipectinata, D. malerkotliana and D. biarmipes lay low number of eggs at low temperature (19°C). Thus oviposition in these four species of Drosophila is significantly reduced at low temperature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Four Drosophila species; Melanogaster group; Temperature; Oviposition.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300014

Spatial heterogeneity of the Tucuruí Reservoir (State of Pará, Amazonia, Brazil) and the distribution of zooplanktonic species
Provedor de dados: 57
Autores: ESPÍNDOLA,E. L. G.; MATSUMURA-TUNDISI,T.; RIETZLER,A. C.; TUNDISI,J. G.
With the purpose of analyzing the horizontal distribution of the zooplankton community of the Tucuruí Reservoir in the State of Pará, Brazil, collections were made at 16 stations during August 1988. The stations cover the regions called Caraipé (C), Araçagi (B) and Ararão (A), and represent the different compartments of this ecosystem in regard to the morphometry and the presence or absence of "flooded forest". Our findings showed the existence of three compartments with different limnological characteristics determined as a function of the system's morphometry, a factor that may have influenced the horizontal circulation of the reservoir's water and, consequently, led to physical, chemical and biological differences at each of the sampled stations. All...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zooplankton; Horizontal distribution; Spatial heterogeneity; Reservoirs.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200001

Aspects of the ecology of proteocephalid cestodes parasites of Sorubim lima (Pimelodidae) of the upper Paraná River, Brazil: I. Structure and influence of host's size and sex
Provedor de dados: 57
Autores: TAKEMOTO,R. M.; PAVANELLI,G. C.
Between March 1992 and February 1996, 107 specimens of Sorubim lima were collected in the floodplain of the upper Paraná river. Ninety-five (88.78%) specimens were parasitized with at least one species of proteocephalid cestodes. 7,573 specimens of four different species were collected (average intensity 79.71 parasites/host): Paramonticellia itaipuensis Pavanelli &amp;amp; Rego, 1991; Nupelia portoriquensis Pavanelli &amp;amp; Rego, 1991; Spatulifer maringaensis Pavanelli &amp;amp; Rego, 1989 and Spasskyellina spinulifera Woodland, 1935. S. maringaensis was the most prevalent and abundant. There were three dominant species P. itaipuensis, S. maringaensis and N. portoriquensis) and one co-dominant species (S. spinulifera). The three environments (lotic,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Community structure; Size and sex influence; Sorubim lima; Proteocephalids; Upper Paraná river; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400006

Ação da insulina na morfogênese de embriões de Gallus gallus domesticus
Provedor de dados: 57
Autores: DIAS,P. F.; MÜLLER,Y. M. R.
Aspectos concernentes à morfogênese de Gallus gallus domesticus viabilizam estudos relacionados à ação da insulina sobre estruturas e topografia embrionárias. Na temperatura de 37,5ºC, ovos foram incubados por 24 h, injetados com 5 ml de insulina de suínos em 3 concentrações e reincubados por mais 72 h. As características morfológicas de 80 embriões foram avaliadas e, de acordo com a organização apresentada, classificados em 5 níveis de morfogênese. Em 21 embriões submetidos aos testes com a insulina registrou-se dismorfismo generalizado (4º nível), enquanto nos de experimento de controle foi verificado morfogênese-padrão (1º nível) e dismorfismo localizado (3º nível). Aqueles espécimes mostraram corpo com dimensões reduzidas, caracterizado por limites...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insulina; Embriões de Gallus gallus; Níveis morfogenéticos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200016

The value of the Ecological Station of Jataí's ecosystem services and natural capital
Provedor de dados: 57
Autores: SANTOS,J. E.; NOGUEIRA,F.; PIRES,J. S. R.; OBARA,A. T.; PIRES,A. M. Z. C. R.
The capacity of a given natural ecosystem to provide certain goods and services that satisfy human needs depends on its environmental characteristics (natural processes and components). It was described the availability of these goods and services (environmental functions) controlled and sustained by ecological processes operating in Ecological Station of Jataí (Luiz Antônio, SP). The environmental functions identified were grouped in four main categories. To make environmental values an integrated factor in planning and decision making it was assessed their socio-economic importance in qualitative terms and, if possible their monetary value. The combined potential annual return from identified functions of Ecological Station of Jataí is at least US$...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecosystem services; Environmental functions; Natural capital; Natural conservation area.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200002

Reproductive cycle of Hepatus pudibundus (Herbst, 1785) (Crustacea, Decapoda, Calappidae) in Ubatuba, SP, Brazil
Provedor de dados: 57
Autores: REIGADA,A. L. D.; NEGREIROS-FRANSOZO,M. L.
This study aimed to analyze the reproductive cycle of the crab Hepatus pudibundus (Herbst, 1785). The crabs were collected in Ubatuba, SP (23°26'S and 45°02'W) monthly from the July, 1992 to June, 1993. Samplings were performed with an "otter trawl". In the laboratory the crabs were numbered, sexed and measured for their maximum carapace width. The gonad developmental stage and the moult stage were also macroscopically registered. In all sampled months ovigerous females and crabs in both sexes with developed gonad were observed. Moult activity in all size classes was verified. Such fact indicates that this species can suffer moult process after their maturity. In despite of temperature being pointed a one of the most important ecological factor in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brachyura; Calappidae; Hepatus; Repoductive cycle.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300013

Influence of linear habitats in mammal activity: test of the travel lanes hypothesis
Provedor de dados: 57
Autores: COELHO,L. H. L.
Mammal activity was monitored by a track-analysis method, in a 180 ha forest fragment. Three 1 km transects, each one with six tracking stations were established: one along a road side and one along a stream bank ("travel lanes") and one in the forest interior. Transects were monitored for six weeks through the months of September, October and beginning of November 1996. The activity of six morph-species of mammals was accessed, providing 251 records. Results of linear and non-linear habitats were compared, to test the "travel lanes" hypothesis, which predicts higher mammal activity in linear habitats. No statistical evidence supporting the hypothesis was found. The roadside transect showed the lowest mammal activity, whereas the stream side transect...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mammal activity; Travel lanes; Edge effects; Forest fragment.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100007

Enzymatic analysis in Anopheles nuneztovari Gabaldón (Diptera, Culicidae)
Provedor de dados: 57
Autores: SCARPASSA,V. M.; TADEI,W. P.
Enzymatic analysis in Anopheles nuneztovari was made using four populations from the Brazilian Amazon and two from Colombia. The enzymes ME and XDH presented a monomorphic locus in all of the studied populations. EST and LAP presented a higher number of loci. In EST, genetic variation was observed in the five loci; LAP presented four loci, with allec variation in two loci. In IDH, three activity regions were stained, with genetic variation for locus Idh-1 in the Brazilian Amazon populations. A locus for MDH was observed, with genetic variation in the six populations. A region was verified for ACON, with four alleles in Sitronela and three in the other populations. PGM constituted one locus, with a high variability in the Brazilian Amazon populations. A...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Isozymes; Electrophoretic profiles; Genetic variation; Neotropical anopheline; Amazonian.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400002

Comparação entre os teores de carboidratos totais solúveis presentes em distintas frações da levedura Saccharomyces cerevisiae Meyen
Provedor de dados: 57
Autores: MENDES-COSTA,M.C.; MORAES,W. B. C.
Linhagens de Saccharomyces cerevisiae foram quantitativamente comparadas quanto ao teor de carboidratos totais solúveis presentes em dois tipos de fração: o "lavado" e o "lisado", com o objetivo de identificar a fração mais rica para ser utilizada em programas de indução de proteção em plantas. Os teores de açúcares encontrados na fração "lavado" foram relacionados com os resíduos do meio de cultura e não com os componentes extracelulares. Testes preliminares determinaram a criotrituração como método adequado de lise celular. Observação relevante foi a grande variabilidade do teor de carboidratos presente no lisado de diferentes linhagens.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carboidratos; Parede celular; Elicitores; Fitoalexina.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100001

Editorial note
Provedor de dados: 57
Tipo: Info:eu-repo/semantics/other
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100001

Editorial note
Provedor de dados: 57
Tipo: Info:eu-repo/semantics/other
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300001

Ventilatory flow relative to intrabuccal and intraopercular volumes in the serrasalmid fish Piaractus mesopotamicus during normoxia and exposed to graded hypoxia
Provedor de dados: 57
Autores: KALININ,A. L.; SEVERI,W.; GUERRA,C. D. R.; COSTA,M. J.; RANTIN,F. T.
Ventilation volume (&lt;img src="http:/img/fbpe/rbbio/v60n2/a08vg.gif" alt="a08vg.gif (265 bytes)" align="absmiddle"&gt; – mlH2O.min–1 ), respiratory frequency (fR – breaths.min–1) and tidal volume (V T – mlH2O.breath–1 ) were measured in a group of Piaractus mesopotamicus (650.4 ± 204.7 g; n = 10) during normoxia and in response to graded hypoxia. The fR was maintained constant, around 100 breaths.min–1, from normoxia until the O2 tension of the inspired water (PiO2) of 53 mmHg, below which it increased progressively, reaching maximum values (157.6 ± 6.3 breaths.min–1) at 10 mmHg. The V T rose from 1.8 ± 0.1 to 6.0 ± 0.5 and 5.7 ± 0.4 mlH2O. breath–1 in the PiO2 of 16 and 10 mmHg, respectively. The &lt;img src="http:/img/fbpe/rbbio/v60n2/a08vg.gif"...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Normoxia; Ventilatory parameters; Buccal and opercular volumes; Piaractus mesopotamicus.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200008

The reproductive strategy of Leporinus friderici (Characiformes, Anostomidae) in the Paraná River basin: the effect of reservoirs
Provedor de dados: 57
Autores: LOPES,C. de A.; BENEDITO-CECILIO,E.; AGOSTINHO,A. A.
The reproductive strategy of a species depends upon the interaction between intrinsic and extrinsic factors. Examining the population of Leporinus friderici in two reservoirs of the Upper Paraná River basin in reference to first gonadal maturation and breeding season and sites, the present investigation tested whether the environment formed by damming promoted spatial and temporal changes in the reproductive strategy of this species. Analyses of sex ratios showed that females significantly predominated in Itaipu, while in Corumbá the sexes were about equal with a slight predominance of males. Size-associated sexual dimorphism was observed, that is females dominated the longer length categories, and males the shorter. The minimum size at which L. friderici...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paraná River basin; Leporinus friderici; Reproduction; Reservoir.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200009

Germination of seeds from herbaceous plants artificially stored in cerrado soil
Provedor de dados: 57
Autores: SASSAKI,R. M.; RONDON,J. N.; ZAIDAN,L. B. P.; FELIPPE,G. M.
The germination of three cerrado herbaceous species: Bidens gardneri, Vernonia herbacea (Asteraceae) and Psychotria barbiflora (Rubiaceae) was studied using seeds stored in cerrado soil and in refrigerator at 4°C. The field experiment was carried out at a preserved area of cerrado, the Reserva Biológica e Estação Experimental de Mogi-Guaçu, State of São Paulo, Brazil. The soil was collected in the same cerrado where the experiment was carried out. The achenes of Bidens gardneri are light sensitive, but this sensitivity disappeared when the achenes were stored in soil. With 3 months storage in cerrado soil no differences in germination in light or darkness were detected. The number of intact achenes retrieved from storage in soil decreased with increasing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bidens gardneri; Vernonia herbacea; Psychotria barbiflora; Seed viability; Light sensitivity.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200011

Tamanho corporal em populações naturais de Didelphis (Mammalia: Marsupialia) do Sul do Brasil
Provedor de dados: 57
Autores: CÁCERES,N. C.; MONTEIRO-FILHO,E. L. A.
Atualmente, poucos são os dados biométricos de marsupiais disponíveis no Brasil considerando-se sua riqueza de espécies. Baseando-se nisto, as relações de tamanho corporal de populações naturais do gambá-de-orelha-branca, Didelphis albiventris, e do gambá-de-orelha-preta, D. marsupialis, foram verificadas em dois remanescentes florestais de Curitiba, Sul do Brasil, entre fevereiro de 1995 e fevereiro de 1997. Como resultado, houve uma forte relação entre a erupção de dentes, o peso e a maioria das medidas corporais obtidas de ambas as espécies. Em conseqüência, parâmetros como o comprimento da cabeça podem ser utilizados para estimar os demais parâmetros corporais dos marsupiais estudados. Foi também observado dimorfismo sexual quanto ao tamanho corporal e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gambás; Biometria; Crescimento; Dimorfismo sexual; Índice de obesidade.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300011

A comunidade de macroinvertebrados aquáticos e características limnológicas das lagoas Carioca e da Barra, Parque Estadual do Rio Doce, MG
Provedor de dados: 57
Autores: MARQUES,M. G. S. M.; FERREIRA,R. L.; BARBOSA,F. A. R.
A comunidade de macroinvertebrados aquáticos, freqüentemente utilizada na avaliação da qualidade de água, foi investigada em dois sistemas lênticos do Médio Rio Doce, que se apresentam sob diferentes status de conservação. As lagoas da Barra e Carioca foram amostradas em suas margens e na região limnética, retirando-se água para caracterização física e química e sedimento para coleta de organismos bentônicos. A lagoa da Barra, que vem sofrendo sucessivos impactos pela ação antrópica, mostrou teores mais baixos de oxigênio dissolvido, elevada condutividade elétrica e sua comunidade bentônica, menor riqueza (14 taxa, contra 33 presentes na lagoa Carioca). A análise das guildas tróficas da ictiofauna sugere que a pressão de predação sobre a comunidade de...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macroinvertebrados aquáticos; Conservação; Sistemas lênticos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200004

Descrição de Astyanax argyrimarginatus sp. n. (Characiformes, Characidae) procedente da bacia do Rio Araguaia, Brasil
Provedor de dados: 57
Autores: GARUTTI,V.
Descreve-se uma espécie nova para o gênero Astyanax Baird &amp;amp; Girard. A. argyrimarginatus procede da bacia do Rio Araguaia, Brasil. Esta espécie pode ser identificada por possuir uma mancha umeral negra horizontalmente ovalada, uma mancha negra no pedúnculo caudal, que se estende à extremidade dos raios caudais medianos, duas barras verticais castanho-escuras na região umeral e uma faixa lateral negra conspícua, bordeada por uma estreita faixa prateada. São discutidos outros caracteres que distinguem a espécie nova das demais espécies do gênero Astyanax portadoras de uma mancha umeral horizontalmente ovalada.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Astyanax argyrimarginatus sp. n.; Characidae; Tetragonopterinae; Taxonomia; Descrição; Rio Araguaia; Brasil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400008

Changes in the thyroid gland during the reproductive cycle of the male vespertilionid bat, Scotophilus heathi
Provedor de dados: 57
Autores: KRISHNA,A.; SINGH,K.
The aim of present study was to compare the changes in thyroid gland with the reproductive cycle of S. heathi. Thyroid showed marked seasonal variation in weight, quantity of colloid and follicular epithelial height, suggesting the thyroid gland to be inactive during quiescence and winter dormancy and active during the time of recrudescence and breeding similarly to the testicular cycle. Plasma thyroxin (T4) concentration showed a significant seasonal change with high concentration during breeding and post-breeding and low concentration during quiescence. However, the T4 concentration increased from breeding to post-breeding phase, when the testes weight was declining. It is suggested that in S. heathi the positive correlation between thyroid and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thyroid; Thyroxin; Testes; Bat; Body weight; Reproduction.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400018

Differences in the number of antennal sensory structures of males of three honey bee types
Provedor de dados: 57
Autores: STORT,A. C.; MORAES-ALVES,M. M. B.
The number of sensilla campaniformia and sensilla coeloconica + sensilla ampullacea of flagellomeres 2 to 11 of the antennae of three types of males (Italian, African and Africanized) was determined by scanning electron microscopy. Comparison of the three male types showed that Italian males did not differ from African males in number of sensilla coeloconica + sensilla ampullacea and that both differed from Africanized males in terms of flagellomere 11. With respect to flagellomeres 3 and 10, Italian males were similar to Africanized males and both differed from African males. No differences between the three male types were detected in the other flagellomeres. In relation to the number of sensilla campaniformia Italian males differed of the African and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Antennae; Flagellomeres; Sensilla; Apis mellifera.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100020

Clustering behavior of hermit crabs (Decapoda, Anomura) in an interdital rocky shore at São Sebastião, Southeastern Brazil
Provedor de dados: 57
Autores: TURRA,A.; LEITE,F. P. P.
The clustering behavior and cluster composition of hermit crabs as well as the patterns of shell utilization of clustered and scattered individuals were studied. This study was conducted in the intertidal region of Grande Beach, São Sebastião, southeastern Brazil. Samples were taken both in randomized transects and 1 m² quadrats during low tide periods. Crabs were counted, measured (shield length), and sexed. Shells were identified and had their adequacy and condition (physical damage and incrustation) recorded. Clusters ocurred mainly in air exposed areas and were dominated or composed only by Clibanarius antillensis. Other species like Paguristes tortugae, Pagurus criniticornis, and Calcinus tibicen were also present in these clusters, but in small...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hermit crabs; Clustering behavior; Clibanarius antillensis; Shell utilization.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100006

Feed training of peacock bass (Cichla sp.)
Provedor de dados: 57
Autores: MOURA,M. A. M.; KUBITZA,F.; CYRINO,J. E. P.
The Amazonian cichlid peacock bass (Cichla sp.) is a highly marketable food and sport fish, therefore a suitable species for aquaculture. However, because of its piscivorous feeding preferences, the species does not accept dry feeds voluntarily, turning its intensive culture difficult and costly. This study aimed to wean fingerling peacock bass from inert moist food to dry diets. In a first experiment, 1,134 fingerlings weighting 0.27 g were divided in two 0.37 m³ hapas and fed ground fish flesh with 35% success. Then, 1.3 g fish were pooled, stocked in six 25 L cages and fed two pellet sequences with 80%, 60%, 40%, 20% and 0% ground fish flesh (GFF). One sequence was flavored with 10% krill meal (Euphausia sp.). Training success of fish fed the GFF-00...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tucunaré; Cichla sp.; Feed training; Palatability enhancers.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400015

Entropia, informação e estresse hídrico em Eucaliptus camadulensis in vitro
Provedor de dados: 57
Autores: SOUZA,G. M.; VILLA NOVA,N. A.; GONÇALVES,A. N.
O presente trabalho objetivou explorar uma nova linha de estudo sobre desenvolvimento de plantas por meio da interpretação de seus estados entrópicos. Em Eucalyptus camadulensis cultivados in vitro em diferentes condições de deficiência hídrica, estes foram avaliados por meio de sua produção de matéria seca utilizando-se as funções de entropia de Clausius e Shannon. O material submetido à deficiência hídrica obedeceu ao segundo princípio da termodinâmica, comportando-se como uma estrutura dissipativa. À medida que houve um aumento na produção de entropia, houve uma menor diferenciação dos tecidos foliares, ou seja, uma redução do nível de organização da planta, principalmente a partir do potencial osmótico de -1,5 MPa. A eficiência termodinâmica ideal para...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Entropia; Informação; Eucaliptus camadulensis; Cultura de tecidos; Estresse hídrico.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300012

Diversity and habitat preference of aquatic insects along the longitudinal gradient of the Macaé River basin, Rio de Janeiro, Brazil
Provedor de dados: 57
Autores: BAPTISTA,D. F.; BUSS,D. F.; DORVILLÉ,L. F. M.; NESSIMIAN,J. L.
Diversity and habitat preference of macroinvertebrates were studied in Macaé River basin, Rio de Janeiro State, Brazil, along its longitudinal gradient. We selected stream reaches corresponding to 1st, 2nd, 4th, 5th and 6th orders. A Surber sampler was used to collect four macroinvertebrates samples of each substrate (sand, litter in pool areas, stones, and litter in riffle areas) during the three sampling periods, defined based on the rain regime: April (end of the rainy season), July (dry season), and October (beginning of the rainy season). We identified 46,431 specimens corresponding to 117 taxa. Analysis of diversity numbers (both for family or genus level) indicated that all insect taxonomic orders had higher numbers on 2nd order stream reach, except...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diversity; Aquatic insects; Longitudinal gradient; Tropical river; Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200007

Is the relationship between population density and body size consistent across independent studies? A meta-analytical approach
Provedor de dados: 57
Autores: BINI,L. M.; COELHO,A. S. G; DINIZ-FILHO,J. A. F.
The Energetic Equivalence Rule (EER) is a controversial issue in ecology. This rule states that the amount of energy that each species uses per unit of area is independent of its body size. Here, we perform a meta-analytical procedure to combine and compare the slopes of population density and body size relationships across independent studies of mammals and birds. We then compared a distribution of 50,000 bootstrap combined slopes with the expected slope (b = -0.75) under the EER. The combined slopes obtained for mammals and birds separately were -0.755 and -0.321, respectively. The homogeneity hypothesis (i. e. within studies the slopes differ by no more than would be expected due sampling variation) was rejected in both cases. So, EER cannot be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meta-analysis; Energetic equivalence rule; Mammals; Birds.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100002

Reproduction and food habits of the lined seahorse, Hippocampus erectus (Teleostei: Syngnathidae) of Chesapeake Bay, Virginia
Provedor de dados: 57
Autores: TEIXEIRA,R. L.; MUSICK,J. A.
The reproductive and feeding biology of the lined seahorse, Hippocampus erectus, was studied in Chesapeake Bay. Seahorses are monogamous, and males incubate the eggs received from females in a closed brood pouch (= marsupium). Females do not play any parental care after mating. Total sex ratio and the operational sex ratio was strongly skewed toward females. Males and females had similar number of eggs/embryos and hydrated oocytes, respectively. The number of eggs/embryos found in the male brood pouch varied from 97 to 1,552 (fish from 80 to 126 mm TL), whereas the number of hydrated oocytes in female varied from 90 to 1,313 (fish from 60 to 123 mm TL). Both, the number of eggs/embryos and hydrated oocytes were better linearly correlated to total weight...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parental care; Fecundity; Fertility; Amphipods; Estuary.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100011

Triceratium moreirae sp. nov. and Triceratium dubium (Triceratiaceae - Bacillariophyta) from estuarine environments of Southern Brazil, with comments on the genus Triceratium C. G. Ehrenberg
Provedor de dados: 57
Autores: FERNANDES,L. F.; SOUZA-MOSIMANN,R. M. de.
A new species of Triceratiaceae is described for estuarine environments of Southern Brazil. The valve of Triceratium moreirae sp. nov. is triangular with elevations bearing ocellus and a rimoportula in their basis. The valvar surface has robust pseudoloculi, circular to polygonal, each one confining a group of areolae arranged in a typical pattern. A central larger areola is surrounded by 5-8 smaller areolae, and they are poroidal with domed cribra. A septum emerges from the valvocopula, having the base reinforced by ribs and the margins folded to the innerside of the valve. The new species is compared to the closely related diatom Triceratium dubium, which has the same pattern of areolar disposition, formation of septum and pseudoloculi. The main...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Taxonomy; Diatom; Triceratium; Estuary; Mangrove; Southern Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100020

Gill infection of Leporinus macrocephalus Garavello &amp;amp; Britski, 1988 (Osteichthyes: Anostomidae) by Henneguya leporinicola n. sp. (Myxozoa: Myxobolidae). Description, histopathology and treatment
Provedor de dados: 57
Autores: MARTINS,M. L.; SOUZA,V. N. de; MORAES,J. R. E de; MORAES,F. R de.
Piauçus (Leporinus macrocephalus), were raised in 300 m² ponds (density of 10 fish/m²) presenting asphyxia signals and daily mortality of 27 fishes. Specimens with 8-cm total body length, were collected for necropsy. Mucus of body surface and pieces of organs were collected and examined microscopically, in wet mounts, stained or in histological sections. The smears examination showed the presence of several spores in the secondary lamellae of the gill filaments, identified as Henneguya leporinicola n.sp (Myxozoa: Myxobolidae). Histopatological study showed epithelial hyperplasia and fulfilling of the spaces between the secondary lamellae, congestion and teleangiectasia sinusoidal. It was also observed hyperplasia of the goblet cells and several cysts of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Myxozoa; Henneguya leporinicola; Leporinus macrocephalus; Histopathology; Description.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300018

Editorial note
Provedor de dados: 57
Tipo: Info:eu-repo/semantics/other
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400001

Actual and potential heterotrophicneutrogen fixation and detrification rates of oryza glumaepatula Steud in an amazonian lake
Provedor de dados: 57
Autores: ENRICH-PRAST,A.; ESTEVES,F. A.; BIESBOER,D. D.
Estimates of the rates of heterotrophic nitrogen fixation (HNF) and denitrification by acetylene reduction and acetylene inhibition, respectively, were determined for the roots and culms of wild rice, Oryza glumaepatula, in Lake Batata, a lake severely impacted by the dumping of bauxite tailings into the lake basin. Two stations were established in different parts of the lake: one in a natural area and other in an impacted area of the lake. Plant assays were performed during the principle hydroperiods of dry (December) and flood (July) to determine both: a) Actual rates of HNF and denitrification, and b) potential rates of HNF after amending with glucose potential rates of denitrification after amending with glucose, glucose + nitrate, or nitrate alone....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biological nitrogen fixation; Amazonian lake; Aquatic macrophyte.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300013

Biogeographic and species richness patterns of Gastropoda on the southwestern Atlantic
Provedor de dados: 57
Autores: FLOETER,S. R.; SOARES-GOMES,A.
Patterns of richness and biogeography of Gastropoda molluscs were determined based on lists of species from five sites along the southwestern Atlantic. The analysis of the distribution patterns of these sites confirmed the existence of a broader transition zone between southern Espírito Santo State (21°S) and Rio Grande do Sul State (32°S). This zone is very heterogeneous, presenting a low endemism rate and a significant number of species common to the near provinces, and does not show enough consistency to be considered as an independent biogeographic province as proposed by Palacio (1980). Observing the distribution of species along the southwestern Atlantic we find an increase in the proportion of species with greatest latitudinal ranges (occurring from...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biogeography; Gastropoda; Southwestern Atlantic; Diversity.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400006

Habitat diversity and benthic functional trophic groups at Serra do Cipó, Southeast Brazil
Provedor de dados: 57
Autores: CALLISTO,M.; MORENO,P.; BARBOSA,F. A. R.
The assessment of the diversity of habitats and the characterisation of the functional trophic groups of benthic macroinvertebrate communities of some rivers of Serra do Cipó (MG) were the main objectives of this study. The available trophic resources and the types of substrata were characterised along with the structure and composition of their using functional trophic groups. Serra do Cipó is a watershed divisor of the São Francisco and Doce River basins, including a series of streams and rivers, of good water quality and well preserved ecological characteristics. Samples were collected in Cipó, Peixe and Preto do Itambé rivers, besides the Indaiá and Capão da Mata streams at 26 sampling stations, during the rainy (February) and dry (October) seasons of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic macroinvertebrates; Functional trophic groups; Bioindicators; River ecology; Habitat diversity.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200008

Biological observations on Tupiperla (Plecoptera: Gripopterygidae)
Provedor de dados: 57
Autores: FROEHLICH,C. G.
Tupiperla illiesi fly along the year in the coastal mountains of southeastern Brazil, with larger numbers during the warmer rainy season. In the seasonal tropical climate of Central Brazil and Serra do Cipó, MG, T. oliveirai and T. gracilis, respectively, fly along the year but the pattern is still not known. In the higher elevation (ca. 1600 m a.s.l.) of Campos do Jordão, SP, species of Tupiperla may not fly during the colder months. Seasonal size variation, a phenomenon still little understood, occurred both in tropical and subtropical climates of the states of Goiás and São Paulo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tupiperla; Flight periods; Seasonal size variation; Plecoptera; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300009

Observações sobre os hábitos de Rhynchonycteris naso (WIED-NEUWIED, 1820) e Noctilio albiventris DESMAREST, 1818 (MAMMALLIA, CHIROPTERA)
Provedor de dados: 57
Autores: NOGUEIRA,MARCELO RODRIGUES; POL,ANDRÉ.
Observações sobre os hábitos de Rhynchonycteris naso e Noctilio albiventris foram conduzidas na região de Jaíba, ao norte do Estado de Minas Gerais. Colônias dessas espécies foram amostradas em associação com cursos d'água em áreas sob considerável ação antrópica. Houve sobreposição em relação ao período de atividade que se inicia cerca de meia hora após o pôr-do-sol e dura em torno de uma hora. Um segundo período de atividade ao final da noite, e com mesma duração, foi constatado em R. naso e na maioria dos indivíduos de N. albiventris. Ambas as espécies utilizam abrigos noturnos temporários, observandose em N. albiventris a formação de agrupamentos. Capturas em mistnets de fêmeas lactantes nos meses de abril e outubro sugerem que nessa região ambas as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chiroptera; Rhynchonycteris naso; Noctilio albiventris; Padrão de atividade; Reprodução.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300012

Nesting behavior of the swallow-tailed hummingbird, Eupetomena macroura (Trochilidae, aves)
Provedor de dados: 57
Autores: ONIKI,Y.; WILLIS,E. O.
An August or winter nestling of Eupetomena macroura was fed only every 40-50 min for at least 24 days in the nest, with fewer feedings at midday. As in other hummingbirds, it was brooded only the first week or two, and left alone even on cool nights after 12 days, probably due to the small nest size. The female attacked birds of many non-nectarivore species near the nest, in part probably to avoid predation. Botfly parasitism was extremely high, as in some other forest-edge birds.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nesting; Hummingbird; Eupetomena macroura; Parasitism; Predation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400016

Chemotaxis and chemical defenses in seaweed susceptibility to herbivory
Provedor de dados: 57
Autores: PEREIRA,R. C.; DONATO,R.; TEIXEIRA,V. L.; CAVALCANTI,D. N.
Recent studies have show that small marine herbivores with limited mobility (mesograzers) often feed on macroalgae chemically defended against fishes or sea-urchins. In order to verify the involved mechanisms of chemotaxis or chemical defense into this process in Brazilian littoral, two species of brown alga Dictyota menstrualis and Dictyota mertensii were studied against the limited mobility herbivores, the amphipod Parhyale hawaiensis and the crab Pachygrapsus transversus. These two species were studied in order to verify the action of their crude extracts in the defense and chemotaxis processes related to limited mobility of these herbivores. Feeding preference assays revealed that P. hawaiensis do not eaten these Dictyota species. P. transversus do not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seaweed; Chemical defense; Chemotaxis; Feeding.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300005

Investimento na função masculina em Biomphalaria tenagophila (ORBIGNY) (MOLLUSCA, PLANORBIDAE) avaliado pelo número de espermatozóides
Provedor de dados: 57
Autores: MONTEIRO,WARTON; KAWANO,TOSHIE.
Biomphalaria tenagophila é um hermafrodita simultâneo cujo investimento na função masculina foi avaliado pela contagem de espermatozóides do ovoteste e da vesícula seminal, sob diferentes condições experimentais, durante o processo de cópula. Foi criada uma nova técnica para contar espermatozóides separados em uma solução de alquilbenzeno sulfonato de sódio. Em todas as condições experimentais, a vesícula seminal teve mais do dobro de espermatozóides do ovoteste: da ordem de uma centena de milhar para três ou quatro centenas de milhares. Há evidências de que os espermatozóides transferidos no processo de cópula procederam da vesícula seminal do doador e que o equilíbrio do número de espermatozóides na vesícula seminal era restabelecido em menos de 24 horas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomphalaria tenagophila; Molusco; Espermatozóides; Número; Contagem.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300013

Trophic morphology of five benthic-feeding fish species of a tropical floodplain
Provedor de dados: 57
Autores: FUGI,R.; AGOSTINHO,A. A.; HAHN,N. S.
This study describes the morphology of the digestive apparatus and the size and organic content of the ingested food of five species of benthic-feeding fishes (Prochilodus lineatus, Steindachnerina insculpta, Loricariichthys platymetopon, Trachydoras paraguayensis e Iheringichthys labrosus). The samples were taken in the floodplain of the up Paraná River in February and August 1991. The results suggested that these species have different mouth, teeth, gill rakers, stomach and intestine length. These morphologic characteristics were related with the type, size and nutritional quality of the food ingested. Although these species feed on the bottom, the morphologic divergences probably explain the differences in diet.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Trophic morphology; Bottom-feeding; Paraná River.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100005

Hidrogeochemical comparative study of the Jaú and Jacaré-Guaçu River watersheds, São Paulo, Brazil
Provedor de dados: 57
Autores: SOUZA,A. D. G. de; TUNDISI,J. G.
The main subject of the present work was to carry out a hydrochemistry comparative study between two river basins in São Paulo State: the Jacaré-Guaçu Basin (21°37'-22°22'S and 47°43'-48°57'W) and the Jaú Basin (22°09'-22°28'S and 48°16'-48°47'W). Nine sampling points in the Jacaré-Guaçu River and eight in the Jaú River were established. The water sampling was performed once each two months from March/95 to September/95. The following variables were analyzed: temperature (°C), pH, conductivity (muScm--1), dissolved oxygen (mg/L) and ionic water composition. Comparatively the Jaú River showed higher spatial variability, less oxygenated water and higher mineralization, due to high pedological and geological substrate richness, point sources existence and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: River basin; River chemistry; Land uses.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400004

Influence of photoperiod on the uptake of nitrogen and phosphorus in the water by Eichhornia crassipes and Salvinia auriculata
Provedor de dados: 57
Autores: PETRUCIO,M. M.; ESTEVES,F. A.
The main goal of this research was to quantify the concentrations of total and ammonium N, nitrate, total and soluble P in the water in the presence of Eichhornia crassipes and Salvinia auriculata, which were submitted to two different photoperiods in a 24 hours incubation period in the laboratory. The macrophytes were incubated in plastic vials of approximately 1.5 litters, with a previously prepared solution with NH4NO3, NH4Cl, and KH2PO4. Eichhornia crassipes showed the highest average rate of reduction of all the nutrients analysed in relation to Salvinia auriculata. The largest photoperiod reflected in a higher average rate of reduction of nutrients, in both plants. Therefore, we may expect that in some periods of the year (e.g. summer), the aquatic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eichhornia crassipes; Aquatic macrophytes; Nitrogen; Phosphorus; Salvinia auriculata.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300002

Reproductive phenological patterns of cerrado plant species at the Pé-de-Gigante Reserve (Santa Rita do Passa Quatro, SP, Brazil): a comparison between the herbaceous and woody floras
Provedor de dados: 57
Autores: BATALHA,M. A.; MANTOVANI,W.
A natural vegetation area, with 1269 ha, composed mainly by cerrado, located at Santa Rita do Passa Quatro Municipality, São Paulo State, southeastern Brazil (21°36-39'S, 47°36-38'W), was studied. From September 1995 to February 1997, a floristic survey was carried out, when all vascular plant species at reproductive stage were collected. The flowering and fruiting patterns of the community were studied, comparing the herbaceous and the woody species. In the herbaceous component, 239 species were found and, in the woody one, 108 species. The woody species flowered mainly at the beginning of the rainy season, while the herbaceous ones produced flowers generally at the end of that season. The proportion of anemo and autochorous species was greater in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Savanna; Phenology; Pé-de-Gigante; São Paulo; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100016

Variação espacial e temporal da produtividade primária pelo fitoplâncton na represa de Jurumirim (Rio Paranapanema, SP)
Provedor de dados: 57
Autores: HENRY,R.; NUNES,M. A.; MITSUKA,P. M.; LIMA,N. DE; CASANOVA,S. M. C.
Com a finalidade de detectar possíveis variações espacial e temporal na produtividade primária pelo fitoplâncton, um estudo foi efetuado na Represa de Jurumirim (Rio Paranapanema, afluente do Alto Paraná, Brasil) no período de outubro de 1995 a julho de 1996 em três compartimentos, os Braços Paranapanema (três pontos), Taquari (dois pontos) e Ribeirão das Posses (um ponto). O método do C14 foi utilizado para a medição da produção primária e um estudo de parâmetros físicos e químicos correlatos na coluna de água foi feito também. Em novembro de 1995 e janeiro-fevereiro de 1996, o local T2 (região de transição no Braço Taquari) foi o mais produtivo (23,9 e 20,1 mgC.m-2.h-1, respectivamente) e, nos dois outros períodos (abril e julho de 1996), foi o 2º ponto...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Produção primária; Fitoplâncton; Fatores limitantes; Represa tropical.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400005

Abundância de macrocrustáceos decápodas nas áreas rasas do complexo lagunar Mundaú/Manguaba, AL
Provedor de dados: 57
Autores: TEIXEIRA,ROGÉRIO L.; SÁ,HÉLIO S.
Os macrocrustáceos que ocorrem nas partes rasas do complexo lagunar Mundaú/Manguaba foram estudados entre maio de 1988 e abril de1989. As amostragens foram realizadas com rede de arrasto de praia. Foi capturado um total de 15 espécies pertencentes a 6 gêneros e 3 famílias. Baseado no CPUE, as espécies que predominaram em número foram: Palaemon pandaliformis, seguido por Macrobrachium acanthurus e Callinectes danae. Com relação à biomassa, as espécies dominantes foram: C. danae, seguido por C. bocourti, P. pandaliformis, M. acanthurus e C. ornatus. Análises de agrupamento por mês e estação de coleta evidenciaram a associação de dois grupos de espécies: um dominado por portunídeos e outro por palaemonídeos. Como os macrocrustáceos representam importantes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Callinectes; Macrobrachium; Palaemon; Estuário; Mangue.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300005

Distribution and abundance of Chironomidae (Diptera, Insecta) in an impacted watershed in South-east Brazil
Provedor de dados: 57
Autores: MARQUES,M. M. G. S. M.; BARBOSA,F. A. R.; CALLISTO,M.
Patterns of abundance and distribution of chironomid midges (Diptera, Chironomidae) in the middle Rio Doce basin were analysed. Human activities (mining, steel processing, and Eucalyptus spp. forestry) contribute to environmental degradation and low water quality in this watershed. Physical and chemical water traits (dissolved oxygen, pH, total alkalinity, electric conductivity, phosphorus and nitrogen concentrations) of 20 sampling points were used in a Principal Component Analysis (PCA) to establish the best and worst water quality. Sampling points recorded as the most polluted showed low genus richness of Chironomidae, less than five genera from the total 23, and dominance of the genus Chironomus, a bioindicator of environmental stress. Following...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chironomus; Bioindicators; Pollution.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400004

Estimation of population profiles of two strains of the fly Megaselia scalaris (Diptera: Phoridae) by bootstrap simulation
Provedor de dados: 57
Autores: MANZATO,A. J.; TADEI,W. J.; CORDEIRO,J. A.
Based on experimental population profiles of strains of the fly Megaselia scalaris (Phoridae), the minimal number of sample profiles was determined that should be repeated by bootstrap simulation process in order to obtain a confident estimation of the mean population profile and present estimations of the standard error as a precise measure of the simulations made. The original data are from experimental populations founded with SR and R4 strains, with three replicates, which were kept for 33 weeks by serial transfer technique in a constant temperature room (25 ± 1.0°C). The variable used was population size and the model adopted for each profile was a stationary stochastic process. By these simulations, the three experimental population profiles were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bootstrap; Megaselia; Populations; Simulation; Population size.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300006

Morphometrics and adaptatives aspects in africanized honeybees (Apis mellifera)
Provedor de dados: 57
Autores: OLIVEIRA-JR,W. P.; BRANDEBURGO,M. A. M.; MARCOLINO,M. T.
The introduction of the African bees (Apis mellifera scutelata) in Brazil and their expansion in the American Continent created the opportunity to study the process of species adaptation in a new environment. In that process, within intra-specific variability, normalising selection can favour individuals that present a better adaptative morphology and they will constitute the most frequent type found in the population. To test that hypothesis morphometric analyses in samples of colonies of africanized bees and in samples of the populations were performed. The development of the colonies was also evaluated in terms of the amount of their brood, honey and pollen. Analysis of the data indicates that more developed colonies are formed by individuals closer to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Africanized honeybees; Adaptation; Morphologic characters.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200015

Observations on the thermal selection of the pantanal caiman (Caiman crocodilus yacare) hatchlings (Crocodylia: Alligatoridae)
Provedor de dados: 57
Autores: PINHEIRO,M. S.; ANDREOTTI E SILVA,R.; SANTOS,S. A.
Three options of water temperatures in a thermal gradient that changed from 22 to 35°C were offered to Pantanal caiman (Caiman croocodilus yacare) hatchlings. Animals from two nests were submitted to temperatures during 19 days (Nest 1 - 20 caimans caught in the nature hours after hatching), corresponding to 1 to 7 observations periods, and 13 days (Nest 2 - 20 animals obtained by artificial incubation) relative to observation period 8. Caimans remain fasting during experimental period. Hatchlings were allocated in a enclosure containing three styrofoam boxes (120 L) disposed side by side enclosed by wire netting and filled with water to the top. Thus, the animals were free to access the boxes, which temperatures were changed at the end of each observation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caiman; Hatchlings; Pantanal; Thermal selection; Water temperature.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200016

Cross-fostering between two species of marmosets (Callithrix jacchus and Callithrix penicillata)
Provedor de dados: 57
Autores: GUERRA,R. F.; TAKASE,E.; SANTOS,C. V.
Cross-fostering technique can be defined as adoption of infants by adults of other species. This phenomenon is poorly investigated because very young animals have few opportunities to interact peacefully with non-conspecific adults, either in captivity or in natural conditions. This study describes the induction of cross-fostering in captivity between white tufted-ear (Callithrix jacchus) and black tufted-ear marmosets (Callithrix penicillata). We conclude that this technique can be very useful for preserving the life of rejected by parents or orphan infants, mainly in the case of species with low reproduction rate in captivity or those threatened by extinction, as well for investigating the environmental effects on the typical behavior of species...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cross-fostering; Parental behavior; Infants; Reproduction in captivity; Marmosets.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400014

Low courtship song variation in South and Southeastern Brazilian populations of Drosophila meridionalis (Diptera, Drosophilidae)
Provedor de dados: 57
Autores: COSTA,C. T. A.; KUHN,G. C. S.; SENE,F. M.
Drosophila meridionalis is a cactus-breeding species with a wide distribution in South America. Most populations of this species are geographically isolated, what provides a promising scenario for studying evolution. Former studies of this species revealed a remarkable karyotypic variation among its populations. Up to six distinct metaphase chromosomes were described, showing that this species is polymorphic at least at the chromosomal level. In order to elucidate the taxonomic status of populations showing different metaphase chromosomes, we analyzed the courtship song of five populations of D. meridionalis in South and Southeastern Brazil. In addition, we analyzed the metaphase chromossomes of each population. Our results show that, despite the two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Drosophila meridionalis; Courtship song; Karyotype differentiation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100008

A new study method of microhabitat structure of small mammals
Provedor de dados: 57
Autores: CERQUEIRA,R.; FREITAS,S. R.
The variables in habitat studies are usually transformed in such a way that they become abstractions and intuition is lost. We tested a new method for the analysis of habitat using data collected in a grid laid at the "restinga de Maricá", in Rio de Janeiro State, Brazil. Thirty-seven microhabitat variables were measured at each trap station. We assume that these variables characterize the microhabitat structure at the moment when measurements were taken. The data are transformed in 3 ways: (1) the averages of the measured variables were calculated, as usual in habitat studies; (2) the data are transformed in densities per area in square meters without reduction in the number of variables; and (3) we calculated the natural logarithms of the data thus...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Discriminant analysis; Methods; Niche; Neotropics; Small mammals.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200006

A note on the reproduction of Geochelone carbonaria and G. denticulata (Testudines, Testudinidae)
Provedor de dados: 57
Autores: VANZOLINI,P. E.
On the occasion of having collected three gravid Geochelone carbonaria in the Bolivian Chaco, data are given on oviducal eggs, as well as on five shells of eggs of the same species in the Museum collection. A review of the literature on the reproduction of G. carbonaria and of its sibling G. denticulata is presented, with an elementary statistical treatment of the data on number of clutches per reproductive season, interval between clutches, clutch size, egg shape and volume.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Testudines; Reproduction.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400009

Variações estruturais e florísticas do carrasco no planalto da Ibiapaba, estado do Ceará
Provedor de dados: 57
Autores: ARAÚJO,F. S. de; MARTINS,F. R.; SHEPHERD,G. J.
Carrasco é uma vegetação xerófila arbustiva densa alta, ainda pouco conhecida, que ocorre no domínio semi-árido do nordeste do Brasil, sobre Areias Quartzosas distróficas profundas, entre 700 e 900 m de altitude, no planalto da Ibiapaba e chapada do Araripe. Este trabalho tem por objetivo conhecer a estrutura e a composição da comunidade lenhosa e possíveis relações dessas variações espaciais com variáveis pedológicas. Em Jaburuna (3°54'34"S, 40°59'24"W, cerca de 830 m de altitude), município de Ubajara, no norte do planalto da Ibiapaba, foram alocadas 100 parcelas de 10 x 10 m, por sorteio de pares de números em um sistema de coordenadas. Foram medidos o perímetro do caule no nível do solo e a altura vertical do sistema aéreo de todos os indivíduos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carrasco; Arbustaria; Nordeste brasileiro; Estrutura da vegetação; Flora.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400015

Fenologia de árvores em fragmento de mata em São Paulo, SP
Provedor de dados: 57
Autores: FERRAZ,D. K.; ARTES,R.; MANTOVANI,W.; MAGALHÃES,L. M.
A fenologia de 6 espécies arbóreas foi estudada de outubro de 1993 a outubro de 1996, em um fragmento de floresta (10 ha) na região metropolitana de São Paulo (aproximadamente 46º43'W e 23º33'S; 750 m de altitude média). Foram acompanhados indivíduos de Alchornea sidifolia, Cecropia glaziouii, Cedrela fissilis, Cordia ecalyculata, Croton floribundus e Cupania oblongifolia, e observado o período de ocorrência das fenofases: floração, frutificação, queda e brotamento de folhas. Foi realizada a análise descritiva circular da época de ocorrência das fenofases e determinados os coeficientes de correlação múltipla entre a precipitação, a temperatura e as fenofases, para investigar a influência destes fatores do clima na fenologia das espécies. A relação mais...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fenologia; Espécies arbóreas; Fragmento florestal; Sudeste do Brasil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200013

Description and prevalence of Thynnascaris sp. larvae Dollfus, 1933 (Nematoda: Anisakidae) in Plagioscion squamosissimus Heckel, 1840 from Volta Grande Reservoir, State of Minas Gerais, Brazil
Provedor de dados: 57
Autores: MARTINS,M. L.; FUJIMOTO,R. Y.; MORAES,F. R.; ANDRADE,P. M.; NASCIMENTO,A. A.; MALHEIROS,E. B.
The present work studied helminth parasites of freshwater "corvina" Plagioscion squamosissimus from Volta Grande Reservoir, MG, Brazil. Sixty eight fishes with averages of 25.2 cm length and 180.9 g weight were collected with net, bimonthly from December 1995 thru December 1996. Parasites were carefully removed from their cysts that were present in the intestinal mesentery. Specimens were fixed in AFA 65°C and preserved in alcohol 70% with 5% of glicerine. In camera lucida 21 nematodes were drawned after clarification with acetic acid or Amann lactophenol. Nematode larvae were identified as Thynnascaris sp. (Nematoda: Anisakidae). From examined fishes 30 out of 68 presented nematode larvae with a prevalence of 44.1%. The average number of parasites per...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nematoda; Thynnascaris larvae; Plagioscion squamosissimus; Seasonality; Prevalence.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300017

Fitossociologia do componente lenhoso de um refúgio vegetacional no município de Buíque, Pernambuco
Provedor de dados: 57
Autores: RODAL,MARIA JESUS NOGUEIRA; ANDRADE,KARLA VITÓRIA DE ALMEIDA; SALES,MARGARETH FERREIRA; GOMES,ANA PAULA SOUSA.
Com o objetivo de contribuir para o conhecimento da vegetação lenhosa das chapadas sedimentares do sertão de Pernambuco, foi realizada a caracterização fisionômica e a análise da estrutura da vegetação arbustiva perenifólia localizada em uma vertente a barlavento da serra do Catimbau, na propriedade sítio Cigano, Buíque (8°67'LS e 37°1' LW) a 800 m de altitude. Em cem pontos quadrantes, distribuídos em 10 linhas paralelas, interdistantes 30 m, cada uma com 10 pontos quadrantes distanciados 10 m, foram amostrados todos os indivíduos com diâmetro do caule  &gt; ou =  3 cm no nível do solo e altura total  &gt; ou =  1 m. Densidade total, área basal total, alturas e diâmetros médios e máximos foram de 2.207,7 ind./ha, 6,07 m²/ha, 2,3 m e 7,0 m, 5,1 cm e 21,96...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fitossociologia; Refúgio vegetacional; Semi-árido.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300017

Dental development and ontogenetic diet shifts of Roeboides paranensis Pignalberi (Osteichthyes, Characinae) in pools of the Upper Rio Paraná floodplain (State of Paraná, Brazil)
Provedor de dados: 57
Autores: HAHN,N. S.; PAVANELLI,C. S.; OKADA,E. K.
Species of the characid genus Roeboides are known for their habit of tearing off and ingesting scales from other fishes. Specimens of Roeboides paranensis were taken monthly from March 1992 through February 1993 in five pools of the upper Rio Paraná floodplain and in one site in the Rio Paraná itself, with the aim of relating the dental development to ontogenetic diet shifts. Between 15-22 mm SL, fish had teeth with hypertrophied bases (mammiform) that moved to the outside of the mouth in both maxillas. During ontogeny, the diet shifted, with the smallest individuals eating more microcrustaceans and the larger ones eating more scales. Lepidophagy is non-obligatory, because the ingestion of insects and other invertebrates occurred at all sizes. Spatial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Roeboides paranensis; Dental development; Diet shifts; Rio Paraná.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100012

Aspectos biológicos do camarão-espinho Exhippolysmata oplophoroides (Holthuis, 1948) (Crustacea, Caridea, Hippolytidae)
Provedor de dados: 57
Autores: CHACUR,M. M.; NEGREIROS-FRANSOZO,M. L.
O número de ovos e a taxa na qual eles são produzidos podem fornecer uma indicação do potencial reprodutivo de uma espécie. O objetivo deste estudo foi levantar dados básicos sobre a biologia geral de E. oplophoroides e, em particular, sua fecundidade na região de Ubatuba, SP. Os espécimes foram coletados em arrastos camaroneiros na Enseada de Ubatuba, SP (23ºS/45ºN), no período de junho/1995 a maio/1996. O número de ovos relacionados a uma dimensão corpórea (comprimento cefalotorácico) foi ajustado a uma regressão linear. A fecundidade média obtida foi de 2.742 ± 1.561, variando de 434 a 5.215 ovos por fêmea por desova e o volume médio dos ovos foi de 0,015 ± 0,002 mm³. A fecundidade aumentou proporcionalmente com o tamanho de E. oplophoroides. Não houve...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fecundidade; Caridea; Hippolytidae.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100022

The use of mechanical aeration and its effects on water mass
Provedor de dados: 57
Autores: SIPAÚBA-TAVARES,L. H.; FREITAS,A. M.; BRAGA,F. M. S.
Due to the increasing use of artificial aerators in fish ponds, and to the lack of studies on this subject, this work studied some of the aspects associated with their use. The influence of a diffuser type aerator (AR 120) on the biotic and abiotic variables was evaluated in a fish pond. Three points of the pond were marked for the taking of samples: 5, 10 and 23 m from the aerator. Samples were taken every day for 15 consecutive days: 5 days before the use of the aerator, 5 days with the aerator functioning and 5 days with it not functioning. The limnological variables studied did not show significant differences (P &gt; 0.05) when the three sampling points were compared, but regarding the use of the aerator, variables such as water temperature,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mechanical aeration; Limnological characteristics; Pond.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100005

Una nueva especie de rana arborícola (Amphibia: Hylidae: Hyla) de un bosque nublado del oeste de Venezuela
Provedor de dados: 57
Autores: MIJARES-URRUTIA,A.
It is described a new species of treefrog of the genus Hyla, H. amicorum, from the Cerro Socopo, state of Falcón, western Venezuela. This new taxon can be differentiated from the congeners reported from Venezuela by the combination of characteristics as follow: small size (22.6 mm, in male), vestigial webbing between toes II and III, belly strongly areolated, skin dorsally smooth, vent covered totally by a skin fold, no pattern on dorsum, dentigerous processes of the vomer arranged forming a wide "U", located slightly behind and between the choanae. Intrageneric relationships of this new species are obscure, but a close relationships with those groups of H. minuta or H. microcephala groups would not be discarded, nevertheless as long as show unique...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hyla amicorum; Amphibia; Hylidae; Estado Falcón; Venezuela.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400013

Mortalidade dos parasitóides Spilochalcis morleyi (Hymenoptera, Chalcididae) e Xanthozona melanopyga (Diptera, Tachinidae) em pupas femininas e masculinas de Brassolis sophorae (Lepidoptera, Nymphalidae)
Provedor de dados: 57
Autores: RUSZCZYK,A.; RIBEIRO,J. C.
Comparou-se o número médio de adultos emergidos, número de imaturos mortos e a freqüência com que ocorre a morte de toda a prole nos parasitóides Spilochalcis morleyi (Hymenoptera, Chalcididae) e Xanthozona melanopyga no hospedeiro, Brassolis sophorae (Lepidoptera, Nymphalidae). O número de parasitóides (Spilochalcis) que completaram seu desenvolvimento e emergiram foi significativamente maior em pupas femininas do hospedeiro. O número médio de imaturos de Spilochalcis mortos por pupa não diferiu entre os sexos do hospedeiro. Entretanto, nas pupas femininas de B. sophorae ocorreu uma freqüência significativamente maior de morte de toda a prole em ambas as espécies de parasitóides.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Brassolis sophorae; Spilochalcis morleyi; Xanthozona melanopyga; Qualidade do hospedeiro; Mortalidade de parasitóides.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400010

The ichthyofauna of the marginal lagoons of the Sorocaba River, SP, Brazil: composition, abundance and effect of the anthropogenic actions
Provedor de dados: 57
Autores: SMITH,W. S.; BARRELLA,W.
The marginal lagoons of the Sorocaba River fulfil important functions in their lotic ecosystems and for its fish communities, providing shelter, food, and area for fish early stages of development. The lagoons are also an escape from the river pollution since the physical-chemical characteristics of their water are more stable than the river water. Nevertheless, these lagoons are under a series of impacts that contribute to reduce their diversity and stability such as water pollution, deforesting and river dumping. These impacts decrease habitat availability, and modify the fish community structure by reducing the number of species in the Sorocaba River, the floodplains and its marginal lagoons.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish community; Marginal lagoons; Diversity; Pollution; Sorocaba River.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400012

Diversidade genética em palmeiras através de isoenzimas e RAPD
Provedor de dados: 57
Autores: SAWAZAKI,H. E.; BOVI,M. L. A.; SODEK,L.; COLOMBO,C.A.
Estudou-se, mediante polimorfismo enzimático em gel de poliacrilamida e polimorfismo de DNA com base na amplificação de segmentos de DNA ao acaso, denominado RAPD, a variabilidade genética em algumas espécies e ecótipos de palmeiras dos gêneros Euterpe, Bactris, Elaeis e Syagrus. Os extratos de folhas de mudas dessas palmeiras foram analisados para as isoenzimas de malato desidrogenase (MDH), leucinoaminopeptidase (LAP), glutamato oxaloacetato transaminase (GOT), fosfoglucose isomerase (PGI), fosfoglucose mutase (PGM), fosfatase ácida (ACP), peroxidase (PRX), esterase (EST) e para os marcadores RAPD, utilizando os "primers" dos kits A e B da Operon Technologies. Verificou-se grande variabilidade genética interespecífica, comprovada pelos dendrogramas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Juçara; Açaí; Pupunha; Dendê; Híbridos; Variabilidade.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400016

Estudo experimental sobre anéis diários em escamas nas fases iniciais do desenvolvimento do curimba, Prochilodus lineatus (Valenciennes, 1836) (Characiformes, Prochilodontidae)
Provedor de dados: 57
Autores: DOMINGUES,W. M.; HAYASHI,C.
Neste trabalho, estuda-se experimentalmente o crescimento nas primeiras fases de vida do curimba, Prochilodus lineatus (VALENCIENNES, 1836), pela análise das escamas e tamanho dos peixes. Acompanha-se o surgimento das primeiras escamas e a formação dos anéis "diários", relacionando-os com o tamanho e a idade dos indivíduos. Os resultados mostram que as escamas foram observadas a partir do vigésimo dia em indivíduos que apresentaram tamanhos superiores a 11,2 mm. Isto permitiu a elaboração de uma equação, relacionando o número de escleritos das escamas, a idade dos indivíduos criados em condições experimentais e o dia do ano em que o exemplar (selvagem) foi capturado, resultando no seu dia aproximado de nascimento/eclosão. Outro resultado foi a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prochilodus lineatus; Anéis de crescimento diário; Crescimento em peixes; Anéis em escamas.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400008

Ontogenetic events in androgenesis of Brazilian barley genotypes
Provedor de dados: 57
Autores: SILVA,A. L. S. da; MORAES-FERNANDES,M. I.; FERREIRA,A. G.
This paper describes a simple procedure for obtention of barley (Hordeum vulgare L.) doubled haploid plants from Brazilian hybrid genotypes. Anatomical and histological examinations showed the reversion of barley pollen to an sporophytic mode of development. A sequence of mitosis led to the formation of multicellular pollen grains. Regeneration of plants occurred either by direct embryogenesis or callus formation followed by differentiation through direct embryogenesis or organogenesis. Plants were formed in the same medium used for induction dispensing an additional regeneration step. This procedure makes doubled haploid production simpler and faster. Plantlets were transferred to another medium for rooting and after that planted in pots with vermiculite...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anther culture; Doubled haploids.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200016

Structural indexes and sexual maturity of tambaqui Colossoma macropomum (cuvier, 1818) (Characiformes: Characidae) in Central Amazon, Brazil
Provedor de dados: 57
Autores: VILLACORTA-CORREA,M. A.; SAINT-PAUL,U.
Length, weight, structural index and sexual maturity in tambaqui Colossoma macropomum were analysed. 449 specimens were obtained from the commercial fishing fleet arriving at Manaus Harbour from the floodplain areas from May 1992 to July 1993. The objective of this study is to describe changes in structural index during one hidrological cycle and to interpret them according to the water level fluctuations and to also determine the time, reproductive period and length in sexual maturity. Sex ratio in tambaqui was 1:1 however, the length of females was significantly longer than males'. Length/weight relationship was described by the expression: Pt = 0.00058*Cp2.9039. b value was significantly different from 3 which meant an alometric growth. Lower condition...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colossoma macropomum; Floodplains; Structural index; Reproduction; Sexual maturity.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400013

Seleção de hábitat em duas espécies de jararaca (Bothrops moojeni Hoge e B. neuwiedi Wagler) (Serpentes, Viperidae)
Provedor de dados: 57
Autores: BORGES,R. C.; ARAUJO,A. F. B.
Foram utilizados dados relativos ao uso de hábitat por espécimes de Bothrops moojeni e B. neuwiedi (Serpentes, Viperidae) provenientes de doações ao Jardim Zoológico de Brasília, Universidade de Brasília, Jardim Botânico do Distrito Federal e de um experimento de semicativeiro. Os resultados indicaram forte segregação de hábitat entre ambas as espécies, sendo B. neuwiedi amplamente restrita a áreas abertas, enquanto B. moojeni utiliza principalmente a mata e o ecótono. Não foi encontrada diferença significativa na seleção de hábitat entre indivíduos mantidos isolados e aqueles confinados em um mesmo cercado. Assim, aparentemente, uma espécie não interfere diretamente na seleção de hábitat da outra.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Serpentes; Viperidae; Bothrops; Jararaca; Seleção de hábitat; Cerrado; Semi-cativeiro.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400006

Pollen spectrum of honey of "uruçu" bee (Melipona scutellaris Latreille, 1811)
Provedor de dados: 57
Autores: CARVALHO,C. A. L. de; MORETI,A. C. de C. C.; MARCHINI,L. C.; ALVES,R. M. de O.; OLIVEIRA,P. C. F. de.
In spite of the importance of the "uruçu" bee as honey producer of excellent quality, as well, potential pollinator both in agricultural and natural ecosystems, mainly in North-eastern Brazil, just some information is found in literature about sources that such bees utilize to collect nectar and pollen. The identification of the plants visited by Melipona scutellaris was accomplished with base on the analysis of pollen types found in the honey samples collected every two months, from March 1997 to February 1998, in 15 colonies located in Catu, State of Bahia, Brazil (12°21'00"S, 38°22'40"W, 76 m of altitude). Qualitative and quantitative analysis of the pollen types were carried out determining the percentage and occurrence classes. Twenty-eight pollen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollen; Honey; Bee plants; Meliponinae.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100009

Abundance of cladocerans in the littoral regions of two environments of the Upper Paraná River floodplain, Mato Grosso do Sul, Brazil
Provedor de dados: 57
Autores: ROSSA,D. C.; LANSAC-TÔHA,F. A.; BONECKER,C. C.; VELHO,L. F. M.
The abundance of cladocerans recorded in plankton samples from the littoral regions of two enviroments (Baía River and Guaraná lake), the Upper Paraná River floodplain and some limnological variables important in controlling their abundance were investigated at three sites in the lake and two in the river, from March/93 to January/94. Abundance was highest in the lake, chiefly during high water. Bosminidae dominated in both environments and hydrological periods (high and low water). Chydoridae were more important in the lake, and Sididae in the river. A higher number of Pearson's correlations significative (p &lt; 0.03) between the densities of the ten most important species and the limnological variables was observed in the river. This suggests that...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cladocerans; Littoral; Floodplain; Tropical.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100007

Larvae and post-larvae of Penaeidae and Palaemonidae in coastal lagoons of the North of Rio de Janeiro (Macaé, RJ)
Provedor de dados: 57
Autores: ALBERTONI,E. F.; PALMA-SILVA,C.; ESTEVES,F. A.
The northern part of the state of Rio de Janeiro shelters many coastal lagoons, located, mostly, in the "restinga" strip that stretches from the municipality of Macaé to the municipality of Quissamã. During 1995 and 1996 samplings were made aiming to verify the diversity and density of Natantia larvae in the Imboassica, Cabiúnas and Comprida lagoons. The monthly samples were taken with a 500 µ net, in horizontal drags from a boat. In Comprida lagoon no larvae of any family of these crustaceans were found. In Cabiúnas lagoon, the autumn was the season of the year with greatest relative abundance, the larvae belonging to only one genus: Macrobrachium. In Imboassica Lagoon samples were taken in two situations related to the variation of the water level and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coastal lagoons; Larvae; Penaeidae; Palaemonidae; Crustacea; Distribution.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100014

The kariotype of the parasitoid Chelonus insularis Cresson (Hymenoptera, Braconidae, Cheloninae)
Provedor de dados: 57
Autores: SILVA-JUNIOR,J. C.; POMPOLO,S. das G.; CAMPOS,L. A. de O.; CRUZ,I.
The karyotype of Chelonus insularis (Hymenoptera, Braconidae, Cheloninae) is described. The males show an haploid number of seven chromosomes and the females a diploid number of fourteen chromosomes, confirming haplo-diploid sex determination. Comparisons of these results with karyotypes of other species of the same family were done and a possible mechanism involved in the karyotype evolution of this species is discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cytogenetic; Chromosome and sex determination.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200019

Changes in lactate dehydrogenase and malate dehydrogenase activities during hypoxia and after temperature acclimation in the armored fish, Rhinelepis strigosa (Siluriformes, Loricariidae)
Provedor de dados: 57
Autores: PANEPUCCI,L.; FERNANDES,M. N.; SANCHES,J. R.; RANTIN,F. T.
Lactate (LDH) and malate dehydrogenase (MDH) of white skeletal muscle of fishes acclimated to 20, 25 and 30°C and thereafter submitted to hypoxia were studied in different substrate concentrations. Significant differences for LDH and MDH of white muscle enzyme activities are described here for the first time in Rhinelepis strigosa of fishes acclimated to 20°C and submitted to hypoxia for six hours. LDH presented a significant decrease in enzyme affinity for pyruvate in acute hypoxia, for fishes acclimated to 20°C and an increase for fishes acclimated to 30°C.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Hypoxia; Acclimation temperature; Lactate dehydrogenase; Malate dehydrogenase; Armored fish; Rhinelepis strigosa.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200021

Diet of the colubrid snake, Thamnodynastes strigatus (Günther, 1858) from Paraná State, Brazil, with field notes on anuran predation
Provedor de dados: 57
Autores: BERNARDE,P. S.; MOURA-LEITE,J. C.; MACHADO,R. A.; KOKOBUM,M. N. C.
Dissection of 44 specimens of the colubrid snake Thamnodynastes strigatus (Serpentes: Colubridae) provided data on food habits. Prey items include frogs (71.4% of the sample), rodents (14.3%), fishes (10.7%), and lizards (3.6%). The most of the anuran species recorded (Bufo sp., Leptodactylus sp., Physalaemus cuvieri and Scinax fuscovarius) are ground dwellers or call at the water level. Field observations provided information on the feeding behavior.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Serpentes; Colubridae; Thamnodynastes strigatus; Diet; Anuran predation.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400022

Population dynamics and net primary production of the aquatic macrophite Nymphaea rudgeana C. F. Mey in a lotic environment of the Itanhaém River basin (SP, Brazil)
Provedor de dados: 57
Autores: CAMARGO,A. F. M.; FLORENTINO,E. R.
In this paper we evaluated the population dynamics and obtained estimates of the net primary production of the aquatic macrophyte Nymphaea rudgeana in an arm of the Itanhaém River (São Paulo State, Brazil). This species presents, in the studied area, a broad seasonal variation of biomass. As from November (13.1 g DW/m²) we observed a gradual increase of biomass that reached a maximum in February (163.1 g DW/m²). Then, the biomass decreased, maintaining low levels until a new growth period. The reduction of biomass is associated to the development of floating aquatic macrophytes (Pistia stratiotes and Salvinia molesta) and, subsequently to environmental factors (higher salinity values) that are unfavorable to their development. The net primary production of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic macrophyte; Nymphaea rudgeana; Population dynamics; Net primary production; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100011

Feeding habits of Chaoboridae larvae in a tropical Brazilian reservoir
Provedor de dados: 57
Autores: ARCIFA,M. S.
The diet of the four larval instars of a Chaoboridae species of Lake Monte Alegre, was evaluated through the analysis of the crop content of individuals caught at night in the lake. Peridinium and zooflagellates were the major components of the diet of instars I and II, whereas microcrustaceans, especially the cladoceran Bosmina, were most important for late instars. When the preferential prey decreased, in the course of the year, the diet was more diversified, increasing the ingestion of Peridinium by instars III and IV. There is a relationship between the mouth diameter of the larvae and the maximum width, height, or diameter of the ingested organisms.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chaoboridae; Four instars; Diet; Zooplankton; Omnivory.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400008

Characterization of the larval stages of Alphitobius diaperinus (Panzer) (Coleoptera: Tenebrionidae) using head capsule width
Provedor de dados: 57
Autores: FRANCISCO,O.; PRADO,A. P. do.
The mean width (n = 5) of the cephalic capsule instar of Alphitobius diaperinus was determined. The larvae were reared at 27ºC (± 0.1ºC). The result showed that A. diaperinus has eight larval instars. The head capsule of the 1st instar larvae measured x = 0.228 (SD = 0.0192) and the last instar larval measured x = 1.339 (SD = 0.0436). The developmental rate, determined by Dyar-Hutchinson's rule, was 1.29. These data may be useful for studies on phenology and age structure of A. diaperinus in the field.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lesser mealworm; Larval instars; Cephalic capsule; Caged layer manure.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100016

Short-term changes and longitudinal distribution of carbon metabolism in the Piauí River estuary (Sergipe, Brazil)
Provedor de dados: 57
Autores: SOUZA,M. F. L. de; COUTO,E. C. G.
Net pelagic metabolism (NPM) and net ecosystem metabolism (NEM) were assessed by sigmaCO2 changes in three sampling stations along Piauí River estuary. At the upper estuary station, sampling was carried out over 48 h. Samples exhibited high DIN:DIP ratios. Chlorophyll-a ranged from 0.2 to 2.5 mug.l-1, being higher at the upper estuarine station than marine ones. Net pelagic metabolic rates ranged from -13.2 to 61.2 mgC.m7-2.d-1. Presence of mucilaginous algal material can explain the net mineralization. In the photic period, NPM ranged from-0.05 to 3.04 mgC.m-2h-1. NEM ranged from -7.77 to 6.65 mgC.m-2.d-1. Bottom ressuspension due to microphytobenthic flotation and a high turbidity plume inside de estuary reflected in negative metabolic rates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Estuary; Short-term changes; Primary production; Mineralization; Microphytobenthos.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200003

Variação da biomassa aérea de Allagoptera arenaria (Gomes) O. Kuntze (Arecaceae) em uma comunidade arbustiva de Palmae na restinga de Marambaia, RJ
Provedor de dados: 57
Autores: MENEZES,L. F. T. de; ARAUJO,D. S. D. de.
A variação da biomassa aérea de Allagoptera arenaria (Gomes) O. Kuntze (Arecaceae), ao longo de 5 perfis topográficos perpendiculares ao mar, foi analisada em uma comunidade arbustiva de Palmae, na restinga de Marambaia, RJ. Foi encontrada uma relação positiva e altamente significativa da biomassa aérea dessa espécie (F = 39,57; R² = 0,69; P &lt; 0,01) e da cobertura de detritos (F = 525,92; R² = 0,92; P &lt; 0,01) com o distanciamento do mar. O desenvolvimento de A. arenaria está intimamente relacionado com a variação topográfica da área de estudo. Densas populações de A. arenaria enriquecem o solo através do aumento de matéria orgânica sob sua cobertura proveniente de suas folhas senescentes e, conseqüentemente, potencializa o acúmulo de nutrientes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomassa; Allagoptera arenaria; Restinga; Rio de Janeiro.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100017

Preliminar report on the presence of tegumentar glands in the thorax of Meliponinae bees (Hymenoptera, Apidae)
Provedor de dados: 57
Autores: CRUZ-LANDIM,C.; REGINATO,R. D.
This is a first report on the presence of glandular cells in the lateral tegument of the mesothorax of Meliponinae bees. The cells are of the insect class III glandular cells and are present in queens, workers and males. The glands are more developed in queens than in workers, and in workers than in males.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mesothorax; Glands; Tegument; Male; Worker; Queen.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100021

Antennal malformations in light ocelli drones of Apis mellifera (Hymenoptera, Apidae)
Provedor de dados: 57
Autores: CHAUD-NETTO,J.
Malformed antennae of Apis mellifera light ocelli drones were drawn, dissected and mounted permanently on slides containing Canada balsam, in order to count the olfactory discs present in each segment, in comparison with the number of those structures in normal antennae of their brothers. Some drones presented morphological abnormalities in a single segment of the right or left antenna, but others had two or more malformed segments in a same antenna. Drones with malformations in both antennae were also observed. The 4th and 5th flagellum segments were the most frequently affected. In a low number of cases the frequency of olfactory discs in malformed segments did not differ from that one recorded for normal segments. However, in most cases studied, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Apidae; Apis mellifera; Drones; Antennal malformations; Olfactory discs.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100015

Dynamics of some limnological characteristics in pacu (Piaractus mesopotamicus) culture tanks as function of handling
Provedor de dados: 57
Autores: SIPAÚBA-TAVARES,L. H.; MORAES,M. A. G. de; BRAGA,F. M . de S.
In order to study the water quality in fish tanks, a 166-day (January to July 1992) experiment was realized using the indigenous species "pacu" (Piaractus mesopotamicus). Two different protein levels were tested in the diet (16% and 34% crude protein) and three stocking densities (0.25, 0.50 and 0.77 fish/m²). From the results, it was observed that the interactions between stocking density and experiment length affected the characteristics bicarbonate and alkalinity, as well as the interaction between stocking density and protein levels affected concentrations of free and total CO2, conductivity and pH (P &lt; 0.05). The water temperature in tanks changed significantly during the period of study (P &lt; 0.05),decreasing gradually from summer to winter....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stock density; Protein levels; Fish tanks; Pacu; Limnological characteristics.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400003

Seasonal variation of nutrients and energy in tambaqui's (Colossoma Macropomum Cuvier, 1818) natural food
Provedor de dados: 57
Autores: SILVA,J. A. M. da; PEREIRA-FILHO,M.; OLIVEIRA-PEREIRA,M. I. de.
The aim of this study was to evaluate the importance of fruits and seeds as food items in the natural diet of the tambaqui (Colossoma macropomum). During one year, tambaqui's stomach contents were collected, and their nutritional and energetic values were determined. During the flooding period, and while the river water was rising, which coincided with a high availability of fruits and seeds, the protein content of food was low (11%-15% of dry matter basis), whereas in the dry season, when tambaqui fed mainly zooplankton, there was a high protein content (45%-57% of dry matter basis). Lipid, carbohydrate, crude fiber, ash and gross energy contents of the diet varied depending on the river water level and the food items ingested.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tambaqui; Colossoma macropomum; Stomach content; Seasonal variation; Nutritional; Value.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400009

Avifauna de quatro fisionomias florestais de pequeno tamanho (5-8 ha) no campus da UFLA
Provedor de dados: 57
Autores: D'ANGELO NETO,SANTOS; VENTURIN,NELSON; OLIVEIRA FILHO,ARY T. DE; COSTA,FERNANDO A. FRIEIRO.
Este trabalho foi realizado na área do campus da Universidade Federal de Lavras (UFLA), nas coordenadas de 21º13'40" sul e 44º57'50" oeste. Foi marcada uma trilha de cerca de 300 m de extensão em quatro fisionomias florestais encontradas no campus e, entre abril e novembro de 1995, foram visitados mensalmente estes locais, registrando o número de espécies e indivíduos ao longo da trilha, e também observados os padrões ecológicos de cada espécie, como forrageamento e estrato de mata ocupado. Com os dados coletados no levantamento quantitativo, foram calculados alguns parâmetros de abundância para cada local, a similaridade avifaunística entre eles e o índice de diversidade. Como resultado, foram registradas 107 espécies de aves nas quatro fisionomias...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aves; Fragmentação; Perda de espécies.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300011

Effect of the infestation by Lernaea cyprinacea Linnaeus, 1758 (Copepoda, Lernaeidae) on the leucocytes of Schizodon intermedius Garavello &amp;amp; Britski, 1990 (Osteichthyes, Anostomidae)
Provedor de dados: 57
Autores: SILVA-SOUZA,A. T.; ALMEIDA,S. C.; MACHADO,P. M.
Differential white blood cell counts from Schizodon intermedius infested by Lernaea cyprinacea were carried out and compared using the Wilcoxon matched pairs test. The observations were performed in fish infested by 16-77 adult Lernaea, fish with parasitic lesions but without attached crustaceans, and non parasitized fish (control group). The specimens of Schizodon intermedius were obtained from the University of Londrina fish farming facilities. The following leucocytes were observed: lymphocytes, neutrophils, monocytes, basophils, eosinophils and immature leucocytes. Intense lymphocytopenia and neutrophilia were observed in the infested hosts. Consistent increasing of monocyte percentage values occurred in the infested fish. The highest values for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leucocytes; Lernaea cyprinacea; Schizodon intermedius; Lymphocytopenia; Neutrophilia.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200004

Biology of nymphs of Rhodnius robustus Larrousse, 1927 (Hemiptera, Rreduviidae), fed on pigeon or on swiss mouse blood in laboratory conditions
Provedor de dados: 57
Autores: BRAGA,M. V.; PRATA,K. C.; BRAZIL,R. P.
The duration of the life cycle of Rhodnius robustus Larrousse, 1927 as well as the mortality rate of each nymphal instar were studied comparing groups fed on pigeon or on mouse blood weekly or fortnightly. This species showed a better development and lower mortality rate when fed on swiss mouse. The intervals between feedings apparently did not have influence on the shortening of the cycle. We suggest that laboratory colonies and experiments with R. robustus are better maintained when these triatomines are fed on swiss mouse.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodnius robustus; Biology; Life cycle; Feeding preference.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100012

A identidade do Timbó-verdadeiro: Deguelia utilis (A.C.Sm.) A.M.G.Azevedo (Leguminosae -- Papilionoideae)
Provedor de dados: 57
Autores: TOZZI,ANA M. G. DE AZEVEDO.
A descrição original de Lonchocarpus utilis A.C.Sm. é ampliada pela inclusão de informações sobre a inflorescência e flor, uma vez que a espécie foi estabelecida com base em material estéril. Considerando que aspectos reprodutivos são descritos aqui, a espécie é transferida para o gênero Deguelia e é designado um epitipo. Também é proposta a sinonimização de Lonchocarpus nicou var. languidus F.J.Herm.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deguelia utilis; Lonchocarpus; Leguminosae; Combinação nova; Epitipo.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300016

Catálogo sistemático do pólen das plantas arbóreas do Brasil meridional. XXX: Meliaceae
Provedor de dados: 57
Autores: BARTH,ORTRUD MONIKA; JUSTO,RONALDO LAURIA; BARROS,MARCIA AGUIAR DE.
Foi analisada a morfologia polínica de 16 espécies da família Meliaceae. A distinção dos tipos polínicos ocorre em nível genérico, principalmente através da forma dos grãos de pólen, da ornamentação das superfícies e da forma das aberturas. Somente os grãos de pólen de Cabralea canjerana canjerana podem ser caracterizados pela ornamentação da superfície. Como características marcantes em todas as espécies estudadas, destacamse: sexina e nexina-1 não bem delimitadas em alguns gêneros, em contrapartida ao destaque da nexina-2; a invariabilidade da espessura das nexinas-2; o espessamento da sexina e da nexina-1 nas regiões aperturais, a ornamentação delicada da superfície dos grãos de pólen.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Catálogo de pólen; Morfologia polínica; Meliaceae.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300015

Natural history of Ctenus medius Keyserling, 1891 (Araneae, Ctenidae) I: observations on habitats and the development of chromatic patterns
Provedor de dados: 57
Autores: ALMEIDA,C. E.; RAMOS,E. F.; GOUVÊA,E.; CARMO-SILVA,M. do; COSTA,J.
Ctenus medius Keyserling, 1891 is a common species in several spots of Mata Atlântica, however there is a great lack of studies in all aspects of its natural history. This work aims to elucidate aspects of ecotope preference compared to large spiders, and to provide data on the development of chromatic patterns during its life cycle. The observations on the behavior of C. medius were done in the campus of Centro Universitário de Barra Mansa (UBM) by means of observations and nocturnal collections using cap lamps. For observations on the development of chromatic patterns, spiderlings raised in laboratory, hatched from an oviposition of a female from campus of UBM, and others spiderlings collected in field were used. The field observations indicate that: C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ctenus medius; Ctenidae; Natural history.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300015

The toxicity of jack bean [Canavalia ensiformis (L.) DC.] canatoxin to plant pathogenic fungi
Provedor de dados: 57
Autores: OLIVEIRA,A. E. A.; GOMES,V. M.; SALES,M. P.; FERNANDES,K. V. S.; CARLINI,C. R.; XAVIER-FILHO,J.
Protein fractions obtained from seeds of the jack bean (Canavalia ensiformis) as well as the amino acid canavanine, present in these seeds, were tested for their capacity to inhibit the growth of the phytopathogenic fungi Macrophomina phaseolina, Colletotrichum gloesporioides, Sclerotium rolfsii and Fusarium oxysporum. We found that most of the proteins examined and also canavanine did not have any effect on the growth of these fungi. On the other hand the toxic protein canatoxin was found to be effective, at a concentration of 2%, in the inhibition of the growth of M. phaseolina, C. gloesporioides and S. rolfsii.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Canavalia ensiformis; Jack bean seeds; Canatoxin; Phytopathogenic fungi.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100008

Biologia da polinização de Jacaratia spinosa (AUBL) ADC. (CARICACEAE) em mata residual do sudeste brasileiro
Provedor de dados: 57
Autores: PIRATELLI,A. J.; PIÑA-RODRIGUES,F. C. M.; GANDARA,F. B.; SANTOS,E. M. G.; COSTA,L. G. S.
A biologia da polinização de Jacaratia spinosa (Aubl) ADC. (Caricaceae) foi estudada na Mata de Santa Genebra, Campinas (20º54'S; 47º05'W), estado de São Paulo, Brasil. Foram obtidos dados de antese floral, volume e concentração de açúcar no néctar, viabilidade do pólen, receptividade do estigma, localização de glândulas de odor, sistemas de reprodução e principais visitantes/potenciais polinizadores. A espécie é dióica e as plantas masculinas florescem por um período maior (52 dias) que as femininas (22 dias). A maioria das flores tem antese noturna, durando as masculinas cerca de 24 horas e as femininas, 48 horas. As masculinas produzem, em média, 112,5 ml de néctar e concentração de açúcar de 13,9%. As femininas não produzem néctar, tendo sido...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caricaceae; Dioicismo; Jacaratia; Polinização.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400015

Temporal variations in community structure in and around intertidal barnacle (Chthamalus challengeri Hoek) patches on a plebby shore in Japan
Provedor de dados: 57
Autores: APOLINÁRIO,M.
The community structure in and around two barnacle (Chthamalus challengeri Hoek) patches (sites A and B) which extended from the middle to the upper intertidal zone on a pebbly shore in Magarisaki (Amakusa, Kyushu, Japan), was studied during summer and winter of 1995 and 1996. The results show a significant decrease in the proportion of substrate covered by barnacles from January 1995 to July 1996. The number of species, number of individuals, and biomass also decreased in the patch areas through time. There were significant differences between inside and outside the patches for percentage of substrate covered by barnacles, number of individuals, number of species, and biomass during the first year. Numbers of some gastropods were significantly higher in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barnacles; Chthamalus challengeri; Community structure; Intertidal; Japan.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100006

Editorial note
Provedor de dados: 57
Tipo: Info:eu-repo/semantics/other
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100001

Insect mortality in Spathodea campanulata Beauv. (Bignoniaceae) flowers
Provedor de dados: 57
Autores: TRIGO,J. R.; SANTOS,W.F. dos.
Tipo: Info:eu-repo/semantics/report
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300019

Desmídias de ambientes fitotélmicos bromelícolas
Provedor de dados: 57
Autores: SOPHIA,M. G.
Pela arrumação de suas folhas as bromeliáceas permitem a retenção de água nos imbricamentos das mesmas, onde é possível o desenvolvimento de uma ficoflórula associada aos fitotelmatas (tanques de bromélias). Nestes ambientes, foram coletadas ao acaso vinte e cinco amostras através do Estado do Rio de Janeiro. Deste total, dezenove continham representantes de desmídias. A flora fitotélmica de desmídias esteve representada por quatorze táxons, tendo sido identificadas dez espécies, três variedades e uma forma taxonômica. Além do predomínio das Zygnemaphyceae, foram também registradas outras cinco classes de algas neste tipo de ambiente: Chlorophyceae, Cyanophyceae, Bacillariophyceae, Xanthophyceae e Dinophyceae.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Algas; Desmídias; Fitotelmo; Sudeste do Brasil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100018

Mitogenic activity of fetal bovine serum, fish fry extract, insulin-like growth factor-I, and fibroblast growth factor on brown bullhead catfish cells - BB line
Provedor de dados: 57
Autores: CYRINO,J. E. P.; MULVANEY,D.R.
Biossays were performed to assess the effects of different levels of growth medium supplementation with fetal bovine serum (FBS), fish fry extract (FE), combinations of FBS and FE, and addition of insulin-like growth factor I (IGF-I) and fibroblast growth factor (FGF) on the proliferation of brown bullhead catfish cells (BB line). Treatments (n = 4) were: 2.5, 5, 10, and 15.0% FBS or FE and 5/2.5, 5/5, 10/2.5, and 10/5 of a FBS/FE combination as supplement to the growth medium, or the addition of 0.1, 1, 2.5, 10, 25, and 75 ng/ml of either IGF-I or FGF to the growth media. Initial cell density was 1.1 x 10(6) cells per well on uncoated 24-well plates. Incubation temperature was 29.5 ± 0.7ºC. Six hours after plating, initial culture medium was removed,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mitogenic activity; Growth factors; Catfish; BB cell line.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300017

Algas planctônicas de um lago artificial do Jardim Botânico Chico Mendes, Goiânia, Goiás: florística e algumas considerações ecológicas
Provedor de dados: 57
Autores: NOGUEIRA,I. de S.; LEANDRO-RODRIGUES,N. C.
Este trabalho visa estudar a composição e fazer algumas considerações ecológicas das algas planctônicas que ocorrem em um dos lagos artificiais do Jardim Botânico Chico Mendes, Goiânia, Goiás, enfocando a florística e aspectos ecológicos entre períodos de seca, início de chuva e período chuvoso, juntamente com alguns parâmetros abióticos (pH, oxigênio - dissolvido e saturado - temperatura do ar e da água, nitratos, nitritos, alcalinidade, cloretos, turbidez, DBO e precipitação). Foram reconhecidos 77 táxons, distribuídos em 9 classes, destes 68,7% foram registrados como sendo primeira ocorrência para o estado e Chlorophyceae, a classe mais representativa. Durante o período chuvoso observou-se maior riqueza específica, com 11 táxons abundantes. No entanto,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fitoplâncton; Florística; Aspectos ecológicos; Lago artificial.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300003

Nichos tróficos em dípteros caliptrados, no Rio de Janeiro, RJ
Provedor de dados: 57
Autores: d'ALMEIDA,J. M.; ALMEIDA,J. R.
Foram calculadas a extensão e sobreposição de nichos tróficos de dípteros caliptrados, criados em variados ambientes do Rio de Janeiro (área rural, urbana e florestal), utilizando-se diferentes substratos de criação (banana amassada, carcaça de camundongo, peixe (sardinha), fígado bovino, camarão e fezes humanas frescas. Foram criadas 14.294 moscas, pertencentes às famílias Calliphoridae, Fanniidae, Muscidae e Sarcophagidae. As maiores sobreposições de nichos tróficos, entre as espécies, foram assim constatadas: área rural: Phaenicia cuprina versus Chrysomya megacephala; área urbana: Phaenicia eximia versus Sarcodexia innota e P. eximia versus Synthesiomyia nudiseta; área florestal: P. eximia versus Hemilucilia flavifacies. Na área rural, o nicho mais...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Moscas; Extensão de nichos; Sobreposição de nichos.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400004

Raptors and "campo-cerrado" bird mixed flock led by Cypsnagra Hirundinacea (Emberizidae:Thraupinae)
Provedor de dados: 57
Autores: RAGUSA-NETTO,J.
Bird mixed flocks including Cypsnagra hirundinacea and Neothraupis fasciata as species with sentinels were studied in "campo-cerrado" in order to investigate the possible relationship between alertness and the mixed flock leadership. This study was conducted from March to September 1996 and mixed flocks were observed on average for 2:30h. The time with sentinels were recorded for C. hirundinacea and N. fasciata. The sentinels of Cypsnagra hirundinacea performed most of the vigilance (time with sentinel was on average 42 ± 17%, 41 ± 17% of which by C. hirundinacea, whereas only 1.2 % by N. fasciata) and gave all the alarm calls recorded (54% of the encounters with raptors stimulated alarm calls). A relationship was verified between time with sentinel and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mixed flock; Sentinel; Thraupinae; Raptors; Nuclear species.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300011

Relationship between dental morphology, sex, body length and age in Pontoporia blainvillei and Sotalia fluviatilis (Cetacea) in Northern Rio de Janeiro, Brazil
Provedor de dados: 57
Autores: RAMOS,R. M. A.; DI BENEDITTO,A. P. M.; LIMA,N. R. W.
The relationship between dental morphology, sex, body length and age of small cetaceans can be used to determine ontogeny, sexual dimorphism and geographical variation. The objective of this study was to determine the relationship between dental morphology, sex, body size and age. A total of 91 specimens of P. blainvillei and 80 specimens of S. fluviatilis accidentally captured in fisheries or stranded in northern Rio de Janeiro (21º37'-22º25'S), from September 1988 to November 1996 were analysed. The teeth root diameter in P. blainvillei was significantly different between the sex; the values for females were larger than males. In neither species aid we observed significant in variations dimension and number of teeth, thickness of dentine and cemental...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pontoporia blainvillei; Sotalia fluviatilis; Dental morphology; Age; Small cetaceans.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200012

Factors affecting biochemical composition of seston in an eutrophic reservoir (Pampulha Reservoir, Belo Horizonte, MG
Provedor de dados: 57
Autores: BOËCHAT,I. G.; GIANI,A.
Sestonic biochemical composition (lipids, proteins and carbohydrates) may change with varying environmental fluctuations. These changes and the effects in the nutritional status of algae consists of an actual increasing source of interest. The aims of this work were to establish the relationship between biochemical composition of seston and 1) a range of physical, chemical and climatological factors, and 2) the natural fluctuation in the species composition in phytoplankton assemblages of the Pampulha Reservoir, an urban eutrophic lake located in Belo Horizonte, MG. Seasonal changes in the biochemical composition were observed in this study. None of the considered abiotic factors alone seem to affect the biochemical composition. So the effects could only...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biochemical composition; Seston; Seasonality.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100009

The importance of glucose for the freezing tolerance/intolerance of the anuran amphibians Rana catesbeiana and Bufo paracnemis
Provedor de dados: 57
Autores: STEINER,A. A.; PETENUSCI,S. O.; BRENTEGANI,L. G.; BRANCO,L. G. S.
Several species of terrestrially hibernating frogs, turtles and insects have developed mechanisms, such as increased plasma glucose, anti-freeze proteins and antioxidant enzymes that resist to freezing, for survival at subzero temperatures. In the present study, we assessed the importance of glucose to cryoresistance of two anuran amphibians: the frog Rana catesbeiana and the toad Bufo paracnemis. Both animals were exposed to -2ºC for measurements of plasma glucose levels, liver and muscle glycogen content, haematocrit and red blood cell volume. Frogs survived cold exposure but toads did not. Blood glucose concentration increased from 40.35 ± 7.25 to 131.87 ± 20.72 mg/dl (P &lt; 0.01) when the frogs were transferred from 20 to -2ºC. Glucose accumulation in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bufo paracnemis; Rana catesbeiana; Freeze tolerance; Cryopreservation; Glucose.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200017

Distribuição e estrutura etária de Ocypode quadrata (Fabricius, 1787) (Crustacea, Decapoda, Ocypodidae) em praia arenosa do litoral sul do Brasil
Provedor de dados: 57
Autores: ALBERTO,R. M. F.; FONTOURA,N. F.
Analisou-se a distribuição espacial e a estrutura da população do caranguejo-fantasma Ocypode quadrata (Fabricius, 1787), habitante da praia de Pinhal, no litoral do Rio Grande do Sul, no período de novembro de 91 a dezembro de 93. Para a análise da distribuição etária, utilizou-se o censo indireto, baseando-se em medidas aleatórias dos diâmetros das tocas. Constatou-se a existência de 2 grupos etários distintos, com possibilidade de um terceiro grupo. A longevidade foi estimada em até 3 anos. Para as relações diâmetro de toca/largura do cefalotórax, comprimento/largura e peso/largura, foram tomadas amostras de animais, utilizando-se técnicas de escavação e uso de armadilhas específicas. As equações que descrevem estas relações são, respectivamente, DT =...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ocypode quadrata; Caranguejo-fantasma; Estrutura populacional; Tocas.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100013

Spatial and temporal organization of aquatic insects assemblages in the longitudinal gradient of a tropical river
Provedor de dados: 57
Autores: BAPTISTA,D. F.; DORVILLÉ,L. F. M.; BUSS,D. F.; NESSIAMIAN,J. L.
The distribution and abundance of aquatic insects were studied in the longitudinal gradient of the watershed of Macaé River, a coastal Atlantic Forest river in South-eastern Brazil. Sampling stations were selected in the first, second, fourth, fifth, and sixth orders and sampled in April, July, and October 1995. This represented the end of the rainy season, the dry season, and the beginning of another rainy season, respectively. In each month four samples were collected using a Surber sampler from each of the following substrates: sand, litter deposited in pool areas, litter in riffle areas, and stones. A total of 46,431 specimens of aquatic insects belonging to ten orders were obtained. The data were analyzed by the multivariate methodologies of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic insect; Longitudinal gradient; Tropical river; Multivariate analysis.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200012

Reproductive aspects of the gulf pipefish, Syngnathus scovelli (Teleostei: Syngnathidae), from Southeastern Brazil
Provedor de dados: 57
Autores: GASPARINI,J. L.; TEIXEIRA,R. L.
This study attempts to assess the relationship between fecundity and fertility of males and females of the gulf pipefish, Syngnathus scovelli. Specimens of this pipefish were collected in detached algae in the inner surf-zone of a dissipative sandy beach in southeastern Brazil. 97 specimens were collected, and they were associates to detached algae. From these, 14 were males, 36 females and 47 immature. Male-female sex ratio was 0.4:1, which was significantly different from the expected 1:1 ratio. Fish ranged from 43 to 98 mm TL (Fig. 1), and males and females showed similar size. Only 7 males were pregnants, while 9 females had hydrated oocytes. Minimum number of eggs/embryos in the pouch was 30 and the maximum 92. Minimum number of hydrated oocytes was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parental care; Brood pouch; Sex role reversal; Surf zone; Detached algae.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100011

Population dynamics of Pseudomonas sp. along a spatial gradient of phosphate: an experimental approach for spatial ecology
Provedor de dados: 57
Autores: CODEÇO,C. T.; GROVER,J. P.
Many theoretical models have been proposed to study the effect of space on population dynamics and interactions, but most of them are difficult to translate into experimental setups due to their abstract nature. Here we defend the gradostat as a valuable experimental tool for testing such theories. The gradostat is a culture system with bi-directional flow that forms nutrient gradients at steady state. In this study, we use a 3-vessel gradostat with a phosphate gradient to study the effect of spatial heterogeneity on the spatial distribution of Pseudomonas sp., an heterotrophic aquatic bacterium. The observed distributions partially agree with theoretical predictions, obtained from a mathematical model.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gradostat; Spatial ecology; Experimental ecology; Mathematical model.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400014

Characterization of the physical and chemical parameters of Ubatuba Bay, Northern Coast of São Paulo State, Brazil
Provedor de dados: 57
Autores: MANTELATTO,F. L. M.; FRANSOZO,A.
The objective of the present study is to characterize the physical and chemical environmental parameters of Ubatuba Bay (SP), as a subsidy for studies of the composition and distribution of benthic crustaceans which live on the non-consolidated sublittoral bottom of this area. Depth, temperature, salinity, dissolved oxygen, organic content and granulometric composition of the sediments were measured monthly from September/95 to August/96 in eight subareas of the bay. The bay presents an average depth of 9.3 m and is characterized by the following annual mean values for the hydrologic factors: temperature 23.8 ºC, salinity 33.2‰ and dissolved oxygen 5.11 mg/l. The annual mean for the organic matter content of the bay bottom sediments was 11.8% and most...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crustacea; Environmental factors; Sediment; Organic content; Ubatuba; Brazil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100004

Electrofishing as a sampling technique for coastal stream fish populations and communities in the Southeast of Brazil
Provedor de dados: 57
Autores: MAZZONI,R.; FENERICH-VERANI,N.; CARAMASCHI,E. P.
Electrofishing adequacy was tested as a technique to obtain quantitative data of coastal stream fish populations and communities in the Southeast of Brazil. Seven field trips, between July/94 and July/95, were done in 5 localities of the Ubatiba fluvial system (Maricá, RJ). Seventeen species, among the 22 collected, had their numbers estimated through the Zipping method, the model used to test the sampling methodology. At each field trip, three removals with electrofishing were done in each locality and, according to the number of obtained species at each locality/field trip, we analysed 315 cases. Nineteen cases, among 315, showed failure condition. Estimates were significant (p &lt; 0.01) in 96% of the studied cases. Non-significant cases were obtained...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Electrofishing; Coastal streams; East basin; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200003

Loss of weight and concentration of carbon, nitrogen, and phosphorus during decomposition of Eichhornia azurea in the floodplain of the upper Paraná river, Brazil
Provedor de dados: 57
Autores: PAGIORO,T. A.; THOMAZ,S. M.
Leaf packs of the aquatic macrophyte Eichhornia azurea were used to experimentally evaluate changes in mass, carbon, nitrogen, and phosphorus concentrations, and C:N ratios during initial stages of decomposition in two different environments, the Paraná River and Garças Lake. Analysis of weight loss showed relatively slow decomposition rates in both environments (0.0047 d-1 and 0.0048 d-1 respectively). Over a 45-day period we observed significant changes (p &lt; 0.05) in concentrations of carbon, nitrogen, and phosphorus, but only carbon differed between the environments (F = 10.479; p = 0.03). Therefore we concluded that detritus behaved similarly during decomposition, since intrinsic characteristics of the environments affected only the carbon...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eichhornia azurea; Decomposition; Floodplain; Paraná river.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400007

Morphological changes in the vaginal epithelium during the oestrous cycle of Calomys callosus (Rodentia, Cricetidae)
Provedor de dados: 57
Autores: RODRIGUES,JEAN FÁBIO TORRES; FERRO,ELOISA AMÁLIA VIEIRA.
This study describes changes in the pattern of microridges, keratinization, desquamation, secretion, leukocyte infiltration as well as the increasing number of mitotic cells in the vaginal epithelium of Calomys callosus during the oestrous cycle. In proestrus, the epithelium is squamous and stratified with a fine layer of keratin and it is overlain by secretory prismatic cells. In oestrous, the epithelium is squamous, stratified and keratinized. In metoestrus, the epithelium is squamous and stratified with loss of the keratin layer. A leukocyte infiltration, extending from the base to the surface of the epithelial layer is also present. At the end of this phase, the surface cells start to become PAS-positive. In dioestrus, the epithelium is stratified. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oestrous cycle; Vaginal epithelium; Calomys callosus; Keratinization; Secretion; Leukocyte infiltration.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300018

Comparative analysis of cranial suture complexity in the genus Caiman (Crocodylia, alligatoridae)
Provedor de dados: 57
Autores: MONTEIRO,L. R.; LESSA,L. G.
The variation in degrees of interdigitation (complexity) in cranial sutures among species of Caiman in different skull regions was studied by fractal analysis. Our findings show that there is a small species effect in the fractal dimension of cranial sutures, but most variation is accounted for by regional differentiation within the skull. There is also a significant interaction between species and cranial regions. The braincase sutures show higher fractal dimension than the facial skull sutures for all three species. The fractal dimension of nasal-maxilla suture is larger in Caiman latirostris than in the other species. The braincase sutures show higher fractal dimensions in C. sclerops than in the other species. The results suggest that different regions...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cranial sutures; Fractal analysis; Osteology; Caiman.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400021

New records of larval hostplants for ithomiinae butterflies (Nymphalidae)
Provedor de dados: 57
Autores: COSTA,F. A. P. L.
Seventeen new records of larval hostplants are given for Ithomiinae butterflies (Lepidoptera: Nymphalidae) in southeastern Minas Gerais, and one in Brasília, DF. At the present state of knowledge, generalizations about larval feeding habits of these insects may be premature.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Butterflies; Hostplants; Ithomiinae; Minas Gerais State; Solanum.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300010

Marine leech, Stibarobdella macrothela (Schmarda, 1861) (Hirudinea, piscicolidae), parasitic on the whaler shark, Carcharhinus Brachyurus (Günther, 1870) (Chondrichthyes, Carcharhinidae), in Southern Brazilian waters
Provedor de dados: 57
Autores: SOTO,J. M. R.
The presence of the sea leech, Stibarobdella macrothela (Schmarda, 1861) (Hirudinea, Piscicolidae), is marked in the south coast of Brazil, based on the single specimen with 67 mm (CT), collected in the intergill ventral region of a whaler shark, Carcharhinus brachyurus (Günther, 1870) (Chondrichtyes, Carcharhinidae), adult male with about 2 m (CT), being treated of the first registrations of S. macrothela in the Southwest Atlantic and the parasitic association with C. brachyurus.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stibarobdella macrothela; Carcharhinus brachyurus; Hirudinea; Chondrichthyes; Ectoparasitism.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400024

Estrutura vegetal e grau de perturbação dos manguezais da Lagoa da Tijuca, Rio de Janeiro, RJ, Brasil
Provedor de dados: 57
Autores: SOARES,M. L. G.
A Lagoa da Tijuca, localizada ao sul da cidade do Rio de Janeiro, possui estreita faixa de manguezal distribuída de forma descontínua ao longo de suas margens. Os bosques de mangue apresentam grande variabilidade estrutural. Nos bosques monoespecíficos de Laguncularia racemosa, com dap médio entre 3,4 e 7,7 cm e altura média entre 4,5 e 7,7 m, há predomínio de indivíduos com menos de 10,0 cm de diâmetro. Nos demais pontos, observamos bosques mistos, mais desenvolvidos, dominados ora por Laguncularia racemosa, ora por Rhizophora mangle (dap médio entre 7,8 e 16,7 cm; altura média entre 6,8 e 16,1 m), ora por Avicennia schaueriana (dap médio de 7,1 cm e altura média de 5,3 m). A variabilidade estrutural observada é forte indício de área alterada. Observações...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Manguezal; Estrutura vegetal; Conservação; Brasil.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300016

Dissolved inorganic carbon and metabolism of an eutrophic lacustrine system: variations from a 36-hours study
Provedor de dados: 57
Autores: PEDROSA,P.; REZENDE,C. E.
Based on variations of pelagial dissolved inorganic carbon (DIC) concentrations this article provides estimations of net primary productivity and net mineralization -- net carbon metabolism -- in Cima Lake (Rio de Janeiro State). DIC concentrations varied from 203 to 773 µmol L-1 and %CO2(aq) (saturation) from 339 to 4,901. Net carbon metabolism per light/dark periods from the 36 hours of study ranged, respectively, from -556 to 503 mmol DIC m-2 12 h-1. Marked variations in daily net carbon metabolism of the lake were also observed. The values ranged from -25 to -194 mmol DIC m-2 day-1. The findings were discussed as indicators of dynamic biological behavior toward production or mineralization of organic matter in the system. And, the system seemed to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: DIC; Carbon metabolism; Net primary productivity; Mineralization; Eutrophic lake.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400010

Foraging behavior of bee pollinators on the tropical weed Triumfetta semitriloba: flight distance and directionality
Provedor de dados: 57
Autores: COLLEVATTI,R. G.; SCHOEREDER,J. H.; CAMPOS,L. A. O.
We studied flight distance and directionality of bee pollinators on the tropical shrub weed Triumfetta semitriloba Jacq. (Tiliaceae), addressing (1) within- and between-plant movement pattern; (2) distances flown between plants; (3) flight directionality. Flowering plants were distributed in well-delimited clumps, in each of two pasture areas (A1 and A2) and one area of forest gap (A3), in Viçosa, southeastern Brazil. Five solitary bee species, Augochlorella michaelis, Augochloropsis cupreola, Pseudocentron paulistana, Ceratinula sp., Melissodes sexcincta, and two social bee, Plebeia droryana, P. cf. nigriceps were observed. All species moved mainly to the nearest flower on the same individual plant and, in between-plant movements, to the first or second...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Foraging behaviour; Directionality; Pollination; Flight distance; Solitary bees.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100005

Lepidopteran caterpillar fauna on lactiferous host plants in the central Brazilian cerrado
Provedor de dados: 57
Autores: DINIZ,I. R.; MORAIS,H. C.; BOTELHO,A. M. F.; VENTUROLI,F.; CABRAL,B. C.
Nine lactiferous plants of five families were examined for caterpillars in a 4 ha cerrado sensu stricto (savanna-like vegetation) area of the University of Brasília Experimental Farm (DF, Brazil), from August 1995 to May 1997. In 5,540 censuses, less than 5% of the plants hosted caterpillars. All the caterpillars found, a total of 55 species in 15 families were reared under laboratory conditions. Pyralidae, Geometridae, Elachistidae, Megalopygidae, and Limacodidae were the richest caterpillar families recorded. Of the 55 species, more than 40% were polyphagous, feeding on different host plant families, while 21 were considered rare species with less than four records during the study period. The species' rareness did not permit any analysis of diet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Latex; Lepidoptera; Host-plants; Cerrado; Diet.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400012

Ocorrência, distribuição e toxicidade de cianobactérias no estuário da Lagoa dos Patos, RS
Provedor de dados: 57
Autores: MATTHIENSEN,A.; YUNES,J. S.; CODD,G. A.
Diversas florações da cianobactéria Microcystis aeruginosa têm sido observadas nas águas do estuário da Lagoa dos Patos nos últimos 15 anos, sem o devido estudo de sua distribuição e ocorrência ou do risco de contaminação do ecossistema aquático. Neste estudo, foram realizadas a identificação e a quantificação das cianobactérias da região estuarina da Lagoa dos Patos, particularmente M. aeruginosa, incluindo um levantamento quali-quantitativo dos principais grupos microfitoplanctônicos em relação à sua distribuição geográfica no estuário. Evidenciou-se que, ao longo de 12 meses, Microcystis aeruginosa esteve presente na região estuarina, com valor máximo de 1,3.10(6)cél.L-1 em dezembro de 1994 e mínimo de 1,5.10(5) cél.L-1 em agosto de 1995, evidenciando a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cianobactéria; Microcystis aeruginosa; Hepatotoxinas; Estuário da Lagoa dos Patos; Microcistinas.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300002

Trophic structure of fish assemblages in the Lower Miranda River, Pantanal, Mato Grosso do Sul State, Brazil
Provedor de dados: 57
Autores: RESENDE,E. K. de.
Of a total of 101 fish species caught in the Lower Miranda River floodplain, 29 were omnivorous, 16 ichthyophagous, 12 herbivorous, 18 detritivorous, 8 zooplanktophagous, 7 insectivorous, 2 lepidophagous, 4 ichthyophagous/insectivorous and 4 zooplanktophagous/insectivorous. Almost half of the species belong to omnivorous and detritivorous trophic guilds. The same is not true when biomass is considered. The number of fish species by trophic guild didn't change along the year whereas the biomass changed significantly. The frequency of abundant fish species was not the same for the sampled environments.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pantanal; Fish assemblages; Trophic structure.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300004

Visits of bats to flowers of Lafoensia glyptocarpa KOEHNE (LYTHRACEAE)
Provedor de dados: 57
Autores: SILVA,S. S. P.; PERACCHI,A. L.
In the present study visits of phyllostomid bats to the Lafoensia glyptocarpa Kohne flowers were observed at Federal Rural University of Rio de Janeiro, Itaguaí municipality, Rio de Janeiro state. This tree species present floral characteristics to fit the "chiropterophilous syndrome", encouraging the visit of four species of bats which showed different behavior patterns, according to their size, weight and access to the food resources. Glossophaga soricina (Pallas, 1766) showed hovering behavior. Phyllostomus hastatus (Pallas, 1767) and Platyrrhinus lineatus (Geoffroy, 1810) showed landing behavior and Artibeus lituratus (Olfers, 1818) fed during the quick flight, without a real landing.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chiroptera; Chiropterophily; Bats; Flowers; Lafoensia glyptocarpa.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100003

Preliminary assessment of heavy metal levels in Mytella falcata (Bivalvia, Mytilidae) from Bacanga River estuary, São Luis, State of Maranhão, Northeastern Brazil
Provedor de dados: 57
Autores: CARVALHO,G. P. de; CAVALCANTE,P. R. S.; CASTRO,A. C. L. de; ROJAS,M. O. A. I.
The concentrations of Cu, Zn, Pb, and Cd were determined in the mussel Mytella falcata from the Bacanga River estuary, in order to evaluate the potential role of domestic effluents released "in natura" on the quality of the estuarine environment with consequences to shellfish resources. Cu concentrations ranged from 5.2 mg.g-1 to 13.1 mg.g-1, while Zn concentrations ranged from 49.1 mg.g-1 to 76.3 mg.g-1. Pb and Cd showed concentrations lower than 2 mg.g-1. The results showed low concentrations of Cu, Pb and Cd in the filter-feeding Mytella falcata in the study area in comparison with the maximum values stablished to foods by the Brazilian Government (Decree Law Nº 55,871). Finally, Zn presented slightly higher values than the maximum ones stablished by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heavy metals; Bivalves; Mytella falcata; Estuary; Pollution.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100003

Comparative study of the zooplankton composition of six lacustrine ecosystems in Central Brazil during the dry season
Provedor de dados: 57
Autores: STARLING,F. L. do R. M.
Zooplankton community from six lacustrine ecosystems located in Federal District (Central Brazil) was studied based on samples collected during the dry season (July to September). A total of 71 taxa were recorded: 44 rotifers, 17 cladocerans and 10 copepods. The highest number of zooplankton species was recorded in oligotrophic Bonita Pond (32 species) and the lowest number in hypertrophic waste stabilisation ponds (7 species). This tendency of decreasing the diversity with increasing trophic level was consistent with a cluster analysis of the samples based on Sorensen index of similarity. From the overall similarity dendrogram, two groups of ecosystems were distinguished: one containing the natural ponds Bonita and Formosa and the other comprising the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zooplankton taxonomy; Tropical zooplankton; Trophic state.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100013

Nota Editorial
Provedor de dados: 57
Tipo: Info:eu-repo/semantics/article
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400001

Morphometrical aspects of adults of Gratiana spadicea (Klug) Coleoptera, Chrysomelidae) from Southern Uruguay
Provedor de dados: 57
Autores: PONCE DE LEÓN,R.; FAILLA,G.; MORELLI,E.
Morphometrical data of pronotum, elytra, and total length of adult males and females of a Gratiana spadicea population from southern Uruguay are given. Descriptions and illustrations of aedeagus and spermatheca are provided for the first time. Females were significatively larger than males in total length. The coefficient of variation of the aedeagus measures ranged from 3.7% to 7.7%, and those of the spermatheca from 4.1% to 11.2%. The best value for the coefficient of determination was obtained for the reciprocal regression (1/Y = a + bX) of the total length of the aedeagus versus the length from the apex to the basal region of the median lobe.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chrysomelidae; Morphometrics; Gratiana; Uruguay.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300008

Ultrastructure of ovarian follicular epithelium of the Amazonian fish Pseudotylosurus microps (Teleostei: Belonidae): morphological and histochemical characterization of the intercellular deposits
Provedor de dados: 57
Autores: CRUZ-LANDIM,C.; CRUZ-HÖFLING,M. A.
The present paper reports the presence of great quantities of electrondense intercellular material in the follicular epithelium of P. microps. The material apparently is uptaken from circulation and enter the follicle through the intercellular spaces accumulating in the epithelial median-apical intercellular spaces and in perioocytic space. The accumulation starts in the early growth of the primary oocyte and proceed until vitellogenesis. The possible chemical nature and function of the deposits are discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chorion; Oocytes; Oogenesis; Electrondense deposits; Follicle.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100017

Pollination ecology of the tropical weed Triumfetta semitriloba Jacq. (Tiliaceae), in the South-eastern Brazil
Provedor de dados: 57
Autores: COLLEVATTI,ROSANE G.; CAMPOS,LÚCIO A. O.; SILVA,ALEXANDRE F. DA.
This work aimed to study the pollination ecology of the tropical weed Triumfetta semitriloba Jacq. (Tiliaceae), in Viçosa, South-eastern Brazil, during the flowering season of 1993 and 1994. Two patches located in pasture (P1 and P2) and one patch in a forest trail (P3) were chosen and ten plants on each patch were sorted. The number of opened flowers were counted during one day, in each flowering month and patch. All observed flower visitors were identified and their behavior while visiting flowers was recorded. Frequency of visits to flowered branches was obtained and some pollinator individuals were captured for analysis of pollen load. Flowers are conspicuously yellow and actinomorphic, with five nectaries around the ovary base, and opened sequentially...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pollination; Triumfetta semitriloba; Tiliaceae; Tropical bees; Weed.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300004

Androlaelaps rotundus Fonseca (Acari: Laelapidae) associated with akodontine rodents in Paraguay: a morphometric examination of a pleioxenous ectoparasite
Provedor de dados: 57
Autores: GETTINGER,D.; OWEN,R. D.
A multivariate analysis of morphometric data suggests that the nominally pleioxenous ectoparasite, Androlaelaps rotundus, includes at least three distinct host-associated populations in Paraguay. Where multiple akodontine hosts occur sympatrically, each host species is accompanied by a morphologically distinct mite population. These host-mite associations were consistent across all localities, implying that A. rotundus is a complex of unrecognized species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ectoparasites; Laelapidae; Androlaelaps; Eubrachylaelaps; Akodontini; Akodon; Bolomys; Paraguay.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300007

Responses to climatic factors by foragers of Plebeia pugnax Moure (in litt.) (Apidae, Meliponinae)
Provedor de dados: 57
Autores: HILÁRIO,S. D.; IMPERATRIZ-FONSECA,V. L.; KLEINERT,A. de M. P.
Flight activity of Plebeia pugnax Moure (in litt.) was studied in six colonies coming from Cunha, SP, from July to October 1994. Twice a week, from 8:00 a.m. to 6:00 p.m., for 5 minutes every half-hour, all the bees entering and leaving the hives were counted. Six hundred counts were made and the materials that foragers carried were recorded. Data were analysed in relation to temperature, relative humidity, light intensity and day time. Foragers' flight activity was relatively constant in a wide range of temperature, from 22°C to 34°C. The minimum temperature for the beginning of flight activity was 14°C. Effective flight activity (when foragers of all colonies were leaving the hives) occurred at 15°C. These bees also flew within a wide range of relative...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Flight activity; Stingless bees; Climatic factors.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200003

Recent Studies on Neoechinorhynchus curemai Noronha, 1973 (Acanthocephala: Neoechinorhynchidae), in Prochilodus lineatus Valenciennes, 1836, from Volta Grande Reservoir, MG, Brazil
Provedor de dados: 57
Autores: MARTINS,M. L.; FUJIMOTO,R. Y.; ANDRADE,P. M.; TAVARES-DIAS,M.
The present work described helminth parasites of curimbatá, Prochilodus lineatus Valenciennes, 1836 from Volta Grande Reservoir, MG, Brazil. Eighteen fishes with average 46.7 ± 1.1 cm length and 1,674.8 ± 75.6 g weight were collected. Of the analysed fishes, 15 were parasitized with acanthocephalans in the intestine, showing a prevalence of 83.3%. The helminth was identified as Neoechinorhynchus curemai Noronha, 1973 (Acanthocephala: Neoechinorhynchidae). It differs from other species in dimension of characters and morphology. From the original description of N. curemai, it differs from the biggest dimension of testis, elongated cement gland, nucleated lemnisci, eggs size, larger proboscis hooks length in the middle and in the third circle in males and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acanthocephala; Neoechinorhynchus curemai; Prochilodus lineatus; Minas Gerais; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400019

Ficoflórula do Lago Amapá em Rio Branco-Acre, I: Euglenophyceae
Provedor de dados: 57
Autores: KEPPELER,E. C.; LOPES,M. R. M.; LIMA,C. S.
As Euglenophyceae da ficoflórula do Lago Amapá I, Rio Branco, Estado do Acre, Brasil, constituem uma contribuição ao inventário ficológico do Estado do Acre. Está baseada no estudo de 15 amostras coletadas com rede de plâncton e passagem de frasco aberto em meio à massa de algas, as quais foram fixadas e preservadas com solução de Transeau. Foram identificadas 25 Euglenaceae. Os gêneros Euglena e Trachelomonas foram os mais bem representados em nível qualitativo.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fitoplâncton; Taxonomia de Euglenaceae; Estado do Acre.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400016

Aspects of the ecology of proteocephalid cestodes, parasites of Sorubim lima (Pimelodidae), of the upper Paraná River, Brazil: II. Interspecific associations and distribution of gastrintestinal parasites
Provedor de dados: 57
Autores: PAVANELLI,G. C.; TAKEMOTO,R. M.
One hundred and seven specimens of Sorubim lima (Bloch &amp;amp; Schneider, 1801) were collected in the floodplain of the upper Paraná River, Brazil between March 1992 and February 1996. Ninety-five specimens (88.78%) were parasited by at least a species of proteocephalid cestode. 7,573 parasites specimens of four different species were collected (average intensity 79.71 parasites/host): Paramonticellia itaipuensis Pavanelli &amp;amp; Rego, 1991; Nupelia portoriquensis Pavanelli &amp;amp; Rego, 1991; Spatulifer maringaensis Pavanelli &amp;amp; Rego, 1989 and Spasskyellina spinulifera (Woodland, 1935). The two most prevalent species, Spatulifer maringaensis and Paramonticellia itaipuensis, were parasiting the entire gastrointestinal tract. Nupelia...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ecology; Interspecific associations; Gastrointestinal distribution; Sorubim lima; Proteocephalids; Upper Paraná River; Brazil.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400007

The role of gallery forests in the distribution of cerrado mammals
Provedor de dados: 57
Autores: JOHNSON,M. A.; SARAIVA,P. M.; COELHO,D.
The Cerrado biome contains a rich mammal community, with an influence from the Amazonian and Atlantic rainforests, principally observed in the gallery forests. In this paper, through literature review, it is shown that the non-volant mammal community of the gallery forests is distinct from the mammal communities of any other physionomy of the Cerrado. Additionally, the gallery forests contain twice as many species common to the rainforests when compared to all the other physiognomies of the Cerrado combined. The gallery forests appear to provide habitat within the Cerrado for rainforest mammals, increasing the biodiversity of this biome. As such, gallery forests may function as dispersion corridors for these species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Dispersion corridors; Gallery forests; Mammals.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300006

Feeding habits and microhabitat utilization by two syntopic Brazilian Amazonian frogs (Hyla minuta and Pseudopaludicula sp. (gr. falcipes)
Provedor de dados: 57
Autores: VAN SLUYS,M.; ROCHA,C. F. D.
We studied the feeding habits and microhabitat use of the Amazonian frogs Hyla minuta and Pseudopaludicula sp. at Serra Norte, Carajás, Brazil. Although living syntopically, the two species differed markedly in both prey types and sizes. Standardized feeding niche breadth of H. minuta (Bst = 0.572) was larger than that of Pseudopaludicula sp. (Bst = 0.149) and their feeding niche overlap was considerably low (10.5%). The two frog species also differed in microhabitat use. When active, Pseudopaludicula sp. were found partially submerged at the lake border whereas H. minuta were found predominantly on Nymphaea sp. leaves. Although we have not evaluated taxonomic effects on diet composition, differences in diet may be partially explained by differences in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diet; Frogs; Resource partitioning; Syntopy.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400003

Toxicology of Lapachol in rats: embryolethality
Provedor de dados: 57
Autores: GUERRA,M. de O.; MAZONI,A. S. B.; BRANDÃO,M. A. F.; PETERS,V. M.
Lapachol is a naphtoquinone with therapeutic potential against enterovirus, Chagas disease and is also used as an antimalarial and antiinflamatory agent. In order to study teratogenic potential of Lapachol, pregnant Wistar rats were treated with 0.5 ml of distilled water (control group); 0.5 ml of hydroalcoholic solution (vehicle group) and 10 mg of Lapachol in 0.5 ml of hydroalcoholic solution (treated group) by oral gavage from the 8th to the 12th day of pregnancy. The following variables were observed: maternal body weight on days 1, 6, l5 and 21 and food intake on days 2, 6, 15 and 21 of pregnancy. The number of live and dead fetuses and the sites of resorptions were counted. The ovaries were weighed and the corpora lutea were counted. Data were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lapachol; Embryotoxicity; Rat.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100021

Distribuição e abundância de peixes bentônicos explotados pelos linheiros ao largo do sudeste do Brasil (1986-1995)
Provedor de dados: 57
Autores: PAIVA,M. P.; ANDRADE-TUBINO,M. F.
Este trabalho trata da distribuição e abundância das principais espécies de peixes bentônicos explotados pelos linheiros ao largo do sudeste do Brasil (latitudes 18º-26ºS), no período 1986-1995, listadas a seguir, com as respectivas participações no total das capturas: batata = Lopholatilus vilariii Ribeiro = 33,4%, namorado = Pseudopercis numida Ribeiro = 18,4%, cherne = Epinephelus niveatus (Valenciennes) = 12,1%, garoupa = Epinephelus marginatus (Lowe) = 4,1% e badejo = Mycteroperca bonaci (Poey) = 3,1%. As pescarias ocorreram em águas tropicais (latitudes 18º- 23ºS) e subtropicais (latitudes 23º-26ºS), tendo como divisor zoogeográfico a ressurgência de Cabo Frio. Os dados foram agrupados por faixas de latitude e de profundidade, segundo espécies e...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Peixes bentônicos; Distribuição e abundância; Pescarias de linheiros; Sudeste do Brasil.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400009

Aspectos cinéticos da degradação de laminados de madeiras em ambientes aquático e terrestre
Provedor de dados: 57
Autores: APRILE,F. M.; DELITTI,W. B. C.; BIANCHINI JR.,I.
Foi estudada a cinética de decomposição de laminados de diversas espécies de madeiras em ambientes aquático e terrestre da Mata Atlântica. Amostras de laminados de cinco espécies de madeiras foram expostas sobre o solo da floresta, enquanto amostras de 12 espécies foram estudadas na lagoa presente na mesma área. Foram usadas bolsas de decomposição,"litter bags", para a avaliação direta da perda mensal de peso. No ambiente aquático verificou-se um período típico inicial com maior perda de peso, devido à lixiviação. A análise de correlação mostrou que a cor da madeira é inversamente relacionada à taxa de decomposição das angiospermas (r = - 0,95), mas a densidade das madeiras não é uma variável preditiva adequada. O processo foi mais rápido no ambiente...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradação; Decomposição; Madeira.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300014

Parental care in the buffy-tufted-ear marmoset (Callithrix aurita) in wild and captive groups
Provedor de dados: 57
Autores: SANTOS,C. V.; MARTINS,M. M.
Studies on cooperative care of offspring in callitrichid primates are biased in favor of observations in captivity. In the wild, however, individuals have to deal with environmental pressures, which may influence their social behavior. We compared the individual effort attributed to parental care offered by members of a wild group (couple, plus a subadult helper) and two captive groups (A: couple, plus an subadult helper, B: couple, plus four adult helpers) of the buffy-tufted-ear marmoset, Callithrix aurita, from weeks 1-12 after the infants' birth. The carrier (breeding male and female or helper) and the infant's feeding (food sharing and foraging for food) were recorded. Up to week four, while the wild breeding pair shared infant carrying at similar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Parental care; Callithrix aurita; Carrying; Wild; Captivity.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400018

Relative growth of Petrochirus diogenes (Linnaeus, 1758) (Crustacea, Anomura, Diogenidae) in the Ubatuba region, São Paulo, Brazil
Provedor de dados: 57
Autores: BERTINI,G.; FRANSOZO,A.
The purpose of this paper is to investigate the relative growth and heterochely in the hermit crab Petrochirus diogenes. Hermit crabs were collected in the Ubatuba region, SP, from 1993 to 1996; using a commercial fishing boat equipped with two double-rig nets. Body mass of each individual was weighed and their cephalothoracic shield and chelar propodus size were measured. Body mass and chelar propodus size were regarded as dependent variables and plotted against length of cephalothoracic shield according to the allometric equation y = a.x b. A total of 479 individuals were obtained being 307 males and 172 females. Cephalothoracic shield width follows an isometric growth for both sexes. Otherwise, right cheliped dimensions show different relative growth...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Relative growth; Hermit crab; Petrochirus; Diogenidae.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400011

Influence of bauxite tailings on the structure of the benthic macroinvertebrate community in an Amazonian Lake (Lago Batata, Pará - Brazil)
Provedor de dados: 57
Autores: FONSECA,J. J. L.; ESTEVES,F. de A.
This research was developed between 1993 and 1996, aiming to study the structure of the benthic macroinvertebrate community, relating it to some abiotic variables, in an amazonian lake (lago Batata), that received for ten years a great amount of bauxite tailings. The benthic macroinvertebrates were collected with a core and the abiotic variables that were measured were: dissolved oxygen, suspended material, depth, transparency (secchi disc), temperature of the water column and total nitrogen, available phosphorus and organic matter in the sediment. With the use of a Principal Components Analysis (PCA), we were able to show that the sampling sites differed regarding the abiotic variables, especially total-N, available-P and organic matter in the sediment,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic macroinvertebrates; Bauxite tailings; Principal Components Analysis.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300004

Deladenus siricidicola,bedding (Neotylenchidae) parasitism evaluation in adult Sirex noctilio, Fabricius, 1793 (Hymenoptera: Siricidae)
Provedor de dados: 57
Autores: FENILI,R.; MENDES,C. J.; MIQUELLUTI,D. J.; MARIANO-DA-SILVA,S.; XAVIER,Y.; RIBAS,H. S.; FURLAN,G.
This work aimed to evaluate the Deladenus siricidicola, Bedding (Neotylenchidae)parasitism in adults Sirex noctilio, Fabricius, 1793 (Hymenoptera: Siricidae). Timber was sampled by cutting out pieces of 0.80 m in length in Sirex noctilio attacked and Deladenus siricidicola inoculated Pinus taeda. Longs were 15-20 cm in diameter, according to the tree age. Samples were packed in gauze-cages, for daily observations, till S. noctilio adults emergence. The emerged insects were transported, in plastic containers to the laboratory, where they were sectioned and dissected under stereoscopic microscopy to observ the nematode occurrence. From the initially proposed ten units, nine of them were evaluated in a total of 1,810 emerged adult insects, being 1,441 males...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sirex noctilio; Deladenus siricidicola; Parasitism; Biological control.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400020

Regionalization of oviducts in Boophilus microplus (Canestrini, 1887) (Acari: Ixodidae) and its potential significance for fertilization
Provedor de dados: 57
Autores: GARCÍA-FERNÁNDEZ,C.; GARCIA,S. M. L.; SCHNEIDER,F. L.; SEVERINO,A. G.; WINKELMANN,E. C.
The structural analysis of oviducts in Boophilus microplus (Canestrini, 1887) in different stages of ingurgitation has indicated that they are constituted primarily of an internal cylinder and an external cylinder with different cell types being found between them. Copulated females in active ingurgitation process show typical variations along the internal cylinder, and three regions can be defined: anterior, ring-like and transitional. Based on such regionalization, hypotheses were raised about where and how fertilization takes place, a process yet to be clarified for the acari.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acari; Ticks; Female reproductive system; Fertilization.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400014

The soil seed bank during Atlantic Forest regeneration in Southeast Brazil
Provedor de dados: 57
Autores: BAIDER,C.; TABARELLI,M.; MANTOVANI,W.
A survey was conducted to determine the density and species composition of viable seeds buried in four stands of a tropical montane forest at Parque Estadual Intervales, Brazil. The objective was to understand: (1) how numbers and composition of the soil seed bank change as the forest regrows, and (2) how such changes affect the species available for regeneration if forests of different ages are cut down. In each forest stand (5, 18, 27-yr-old and a mature forest), 57 soil samples were collected (0-2.5 and 2.5-5 cm deep). Viable seed density of herbaceous species ranged between 11,003 seeds. m-2 (5-yr-old vegetation) and 482 (mature forest), and between 25 (5-yr-old vegetation) and 389 seeds. m-2 (mature forest) for woody plant species in the 0-5 cm soil...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Brazil; Forest regeneration; Pioneer species; Soil seed bank.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100006

Environmental education praxis toward a natural conservation area
Provedor de dados: 57
Autores: SANTOS,J. E. dos; SATO,M.; PIRES,J. S. R.; MAROTI,P. S.
A non-formal Environmental Education (EE) Program has been implemented in the natural conservation area (Ecological Station of Jataí, Luiz Antônio, São Paulo State), through (EE) paradigms, which consider the objectives of education about, in and for the environment within cultural and natural perspectives. The aim of this Program is to support information and scientific knowledge to provide opportunities to the local population to be aware of environmental impacts and risks resulting from the soil use that threaten the environmental quality and the biodiversity of the Ecological Station of Jataí. The Program understands that the promotion of community empowerment could bring the sense of participation and the directives to management for decision-making...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental education; Natural conservation area; Local sustainability.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300001

Comparison of artificial diets for rearing Corcyra cephalonica (Stainton, 1865) (Lep., Pyralidae) for Trichogramma mass production
Provedor de dados: 57
Autores: BERNARDI,E. B.; HADDAD,M. L.; PARRA,J. R. P.
The objective of this research was, based on biological studies, to determine and adequate diet for rearing Corcyra cephalonica (Stainton, 1865) in the laboratory so as to permit the rearing of this factitious host for Trichogramma mass production. The research was conducted at 25 ± 1ºC, RH 60 ± 10% and photophase of 14 hours. Six artificial diets were compared: a) whole wheat flour (48.5%), ground rice (48.5%) and sugar (3%); b) ground rice (97%) and sugar (3%); c) whole wheat flour (48.5%), rice flour (48.5%) an sugar (3%); d) whole wheat flour (97%) and yeast (3%); e) wheat germ (97%) and yeast (3%); f) rice bran (94%), sugar (3%) and yeast (3%); f) rice bran (94%), sugar (3%) and yeast (3%). All of the diets studied permitted the development of C....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corcyra cephalonica; Artificial diets; Rearing; Trichogramma.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100007

The water level influence on biomass of Echinochloa polystachya (Poaceae) in the Jurumirim Reservoir (São Paulo, Brazil)
Provedor de dados: 57
Autores: POMPÊO,M. L. M.; HENRY,R.; MOSCHINI-CARLOS,V.
In the Paranapanema River mouth, Jurumirim Reservoir (23°27'-23°29'S and 48°39'-48°36'W, SP, Brazil), the biomass of E. polystachya was monthly determined with eight quadrats of 0.25 m² from August 1993 to July 1994. The seasonal variation in biomass was unimodal, with greater biomass from November 1993 to April 1994. The average biomass was 1,933.7 ± 479.5 gDW.m-2, with a variation along the year from 1,149.0 to 2,755.9 gDW.m-2. The annual variation of aerial green biomass, aerial and aquatic detritus suggest that the main growth period of E. polystachya was from December 1993 to May 1994, with peak between February to March 1994. The data indicate that this macrophyte is adapted to water level variation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Macrophyte; Echinochloa; Biomass; Water level variation; Reservoir; Poaceae.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100004

Evidence of terrestrial feeding in the arboreal lizard Enyalius bilineatus (Sauria, Polychrotidae) of south-eastern Brazil
Provedor de dados: 57
Autores: ZAMPROGNO,C.; ZAMPROGNO,M. das G. F.; TEIXEIRA,R. L.
The diet of the arboreal lizard E. bilineatus was assessed based on analysis of gut contents of specimens collected in the remnants of the Atlantic rainforest in Espírito Santo State, south-eastern Brazil. Stomachs of the lizards examined (SVL = 57.0-85.0 mm) contained nine arthropod orders. E. bilineatus utilizes a broad range of arthopodan prey type and sizes, and can be considered an arthropod generalist, which uses a sit-and-wait foraging strategy. Orthoptera represented the most important food item, followed by Dictyoptera and Hymenoptera. Hemiptera, Homoptera, Lepidoptera (larvae), Coleoptera, Araneae, and Diplopoda constituted the remainder of food items. The presence of Diplopoda, which are not generally found on tree trunks, provides particularly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Enyalius; Polychrotidae; Food habits; Atlantic Forest; South-eastern Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100012

Ventilatory structures in Cryphocricos barozzii Signoret (Heteroptera, Naucoroidea)
Provedor de dados: 57
Autores: LOPEZ-RUF,M. L.; PELLERANO,G. N.; BACHMANN,A. O.
Plastron and spiracular features strongly resemble those of Aphelocheirus aestivalis (Fab.), described by Messner et al. (1981). Plastronal foliose hairs, somewhat irregular shaped are regularly distributed in the plastron. Very numerous tiny openigs on sternites an tergites connect platronal air with a subcuticular air film limited internally apparently by a membrane. Aplicated, radial, structure at the proximal end of the tracheae, almost occluding the extremely fine spiracular openings, appear with lesser variations in both species, suggesting close relationships than accepted until now.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insect morphology; Spiracles; Taxonomy; Entomology; Heteroptera; Naucoroidea.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200010

Opportunistic adaptations to man-induced habitat changes by some South American Caprimulgidae
Provedor de dados: 57
Autores: INGELS,J.; ONIKI,Y.; WILLIS,E. O.
We describe the opportunistic adaptation to man-induced changes in the habitats of six neotropical Caprimulgidae. Habitats created by those changes, and similar to their original and usual ones, are readily occupied by these nightjars. The occasional invasion of urban environments ("urbanization") is the most recent and most remarkable behavioural adaptation.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Habitats; Urbanization; Neotropical; Caprimulgidae.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400005

A regeneração de uma floresta tropical montana após corte e queima (São Paulo - Brasil)
Provedor de dados: 57
Autores: TABARELLI,M.; MANTOVANI,W.
O corte e queima são um dos tipos de perturbação predominante na floresta Atlântica montana no Sudeste do Brasil. A análise de uma cronosseqüência de regeneração (10, 18, 40 anos e floresta madura) corrobora a hipótese de que as características da floresta se transformam em diferentes velocidades em direção aos valores observados na floresta madura. Em ordem decrescente de velocidade, a floresta, após corte e queima, restaura a riqueza e a diversidade de espécies arbóreo-arbustivas, a composição de guildas, a composição florística (importância relativa das famílias) e, por último, os atributos da estrutura física, com exceção da densidade de indivíduos. A floresta com 40 anos apresentou entre 38,8% e 117,1% dos valores observados na floresta madura,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corte e queima; Floresta Atlântica montana; Regeneração; Resiliência.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200008

Behaviour, habitat use and population size of Sotalia fluviatilis (Gervais, 1853) (Cetacea, Delphinidae) in the Cananéia estuary region, São Paulo, Brazil
Provedor de dados: 57
Autores: GEISE,L.; GOMES,N.; CERQUEIRA,R.
From March 1987 to February 1988, Sotalia fluviatilis population size was estimated and behavioral patterns were observed in the Cananéia estuary region, in Southeast Brazil. Field observations were carried out from shore (40, with a mean observation period of 7.76 ± 2.05 hours a day, completing a total of 310.5 hours) and during line transect surveys by boat (55, 10 of them with a mean observation period of 4.44 ± 0.15 hours each and 45 with a mean observation time of 20 minutes, in the totality 64.3 hours). Dolphins occur in this region all year round, most commonly in small groups, with a greater number observed in January 1988, with no seasonal occurrence pattern. Pairs accounted for ca. 30% and calves were seen year round, always accompanied by one or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sotalia fluviatilis; Habitat use; Population estimation; Behavioral patterns.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200002

Produção e consumo de carbono orgânico na comunidade planctônica da represa da Pampulha, Minas Gerais, Brasil
Provedor de dados: 57
Autores: ARAÚJO,MARCOS A. R.; PINTO-COELHO,RICARDO M.
O presente estudo tem por objetivo investigar a importância relativa do fitoplâncton como recurso alimentar para o zooplâncton em um reservatório hipereutrófico tropical. Para atingir esta meta, dois enfoques foram adotados. O primeiro deles consistiu num monitoramento regular (mensal) dos teores de biomassa do zooplâncton e das suas fontes de alimento expressas em termos de biomassa de carbono de partículas sestônicas. O segundo enfoque consistiu numa abordagem experimental com o objetivo de determinar o balanço entre a produção primária e o consumo de carbono orgânico na comunidade planctônica do reservatório. Tal avaliação deu-se através da mensuração simultânea das taxas de produção primária líquida potencial do fitoplâncton e das taxas de assimilação...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Produção primária; Produção secundária; Carbono orgânico particulado; Zooplâncton.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300006

The role of pre-recruitment processes in the maintenance of a barnacle (Chthamalus challengeri Hoek) patch on an intertidal pebble shore in Japan
Provedor de dados: 57
Autores: APOLINÁRIO,M.
To understand the role of pre-recruitment processes (supply of larvae and recruitment) in the maintenance of an intertidal barnacle (Chthamalus challengeri Hoek) patch, the availability of cyprid larvae and the recruitment on natural pebble substrata was monitored on the Magarisaki pebble shore (Amakusa, Kyushu, Japan) during 1995 and 1996. Also, a hypothesis that predation and/or bulldozing by mobile intertidal mollusks during the post-recruitment period could be an important factor in mortality of these barnacles was tested. The collapse of the adult population and the consequent disappearance of the patch were observed by the middle of 1995. The larval availability was low (&lt;FONT FACE="Symbol"&gt;@&lt;/FONT&gt; 6 cyprid larvae/100 l), as was the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Barnacles; Chthamalus challengeri; Larval supply; Recruitment; Japan.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200007

Densidad y diversidad del zooplancton en los ríos Salado y Negro --Planicie del Río Paraná -- Argentina
Provedor de dados: 57
Autores: MARGARITA FRUTOS,SANTA.
Zooplankton abundance and diversity of Salado and Negro rivers were compared in relation to the water level fluctuations. The zooplankton pumper samples were collected between March, 1993 and October, 1994. Mean zooplankton density at Salado river was very higher in upstreem. Zooplankton density in the Negro and Salado rivers were variable in the high water phase. Changes in the density appeared to be related to the hydrologic phases, seasonal cycle and conductivity variation. The zooplankton abundance was positively correlated with the abiotic and biotic factors (temperature, transparency and fitoplankton). The dominant group in the two studied rivers were the rotifers. The dominant species in the high water phase were limnoplanktonic and scarce...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: The rivers; Zooplankton; Density; Diversity and similarity.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300008

Natural and human impacts on invertebrate communities in Brazilian caves
Provedor de dados: 57
Autores: FERREIRA,R. L.; HORTA,L. C. S.
Species richness, abundance, distribution and similairity between cave invertebrate communities were compared among seven caves located in the Peruaçu River valley, north of Minas Gerais State, Brazil. Such comparisons aimed to determinate the degree of biological complexity in the sampled caves, calculated by the "Index of Biological Complexity in Caves", presented in this manuscript. The presence of potencial or real impacts on the cave fauna was also investigated. A total of 1,468 individuals belonging to 57 families of: Acarina, Pseudoscorpionida, Araneida, Opilionida, Amblypygi, Isopoda, Geophilomorpha, Scutigeromorpha, Spirostreptida, Coleoptera, Collembola, Diptera, Dictyoptera, Ephemeroptera, Ensifera, Heteroptera, Hymenoptera, Lepidoptera,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caves; Communities; Impacts; Invertebrates; Peruaçu River.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100003

Structural and morphological features of Piaractus mesopotamicus (Holmberg, 1887) gills
Provedor de dados: 57
Autores: SEVERI,W.; RANTIN,F. T.; FERNANDES,M. N.
The pacu Piaractus mesopotamicus (Holmberg, 1887), is a commercially important serrasalmid fish endemic to the Paraná-Paraguay River basin, and one of the most widely cultivated native fish species in the Neotropics. As a migratory species, also inhabiting temporary pools subjected to hypoxic conditions, the species presents a high plasticity concerning respiratory adaptations. In order to supplement basic knowledge on the respiratory physiology and morphology of this species, some structural features of pacu gills, such as filament and lamellae structure, and circulatory pattern are described in this paper.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gill structure; Gill morphology; Pacu; Piaractus mesopotamicus.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300014

Uptake rates of nitrogen and phosphorus in the water by Eichhornia crassipes and Salvinia auriculata
Provedor de dados: 57
Autores: PETRUCIO,M. M.; ESTEVES,F. A.
The main goal of this research was to survey information about the physiology of Eichhornia crassipes and Salvinia auriculata and their capacity to remove nitrogen and phosphorus from the environment, after quantifying the concentrations of the nitrogen (NO3-N, NH4-N and total-N) and phosphorus (PO4-P and total-P) compounds in the water. The macrophytes were incubated in the laboratory in plastic vials of approximately 1.5 litters containing a previously prepared solution of NH4NO3, NH4Cl and KH2PO4. Eichhornia crassipes exhibited the highest rates of nutrient reduction and the concentrations of NO3-N, NH4-N and PO4-P in the water influenced the uptake rates of nitrogen and phosphorus of the E. crassipes and S. auriculata. This information can help to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Aquatic macrophytes; Eichhornia crassipes; Nitrogen; Phosphorus; Salvinia auriculata.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200006

Proposta de modelo cinético da degradação de laminados de madeiras em ambientes aquático e terrestre
Provedor de dados: 57
Autores: APRILE,F. M.; DELITTI,W. B. C.; BIANCHINI JR.,I.
Um modelo cinético da decomposição de madeiras é proposto a partir de experimentos de degradação de laminados de madeira de 12 espécies vegetais. São discutidos aspectos do decaimento desses recursos em termos cinéticos nos ambientes aquático e terrestre. De modo geral, verificou-se que: 1. o potencial de decaimento dos laminados, em função da lixiviação e/ou mineralização de compostos lábeis, é baixo (menores que 15%), cabendo aos processos oxidativos das frações resistentes a principal rota de mineralização; 2. o meio aquático tendeu a favorecer os processos de dissolução e verificaram-se incrementos nos coeficientes de mineralização do material refratário.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradação; Modelo cinético; Madeira.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300015

Influence of the pineal gland on the physiology, morphometry and morphology of pancreatic islets in rats
Provedor de dados: 57
Autores: LIMA,L. M. B. de; REIS,L. C. dos; LIMA,M. A. de.
To investigate the influence of the pineal gland through melatonin secretion on the physiological and morphological parameters of pancreatic islets, we studied the plasma biochemistry and morphological and morphometric characteristics of the endocrine pancreas of male Wistar rats. The animals were distributed into five groups of ten rats each: NC - normal control group; NS - sham-operated group; Px (25) - pinealectomised group, studied 15-25 days after surgery; Px (70) - pinealectomised group, studied 60-70 days after surgery; ALX - alloxan monohydrate-treated group. Data are analyzed statistically by ANOVA and by the Kruskal-Wallis test. Although there was no significant difference in plasma glucose or insulin levels between the Px (25), Px (70) and NC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pinealectomy; Melatonin; Pancreatic islet; Rat; Morphology.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200018

Entomological fauna from Reserva Biológica do Atol das Rocas, RN, Brazil: I. Morphospecies composition
Provedor de dados: 57
Autores: ALMEIDA,C. E. de; MARCHON-SILVA,V.; RIBEIRO,R.; SERPA-FILHO,A.; ALMEIDA,J. R. de; COSTA,J.
Atol das Rocas, the unique atoll in the South-western Atlantic, is located 144 nautical miles (266 Km) northeast from the city of Natal, NE Brazil and 80 nautical miles from Arquipélago de Fernando de Noronha, with geographic co-ordinates 3º51'S and 33º49"W. It's of volcanic origin and coralline formation. The reef is ellipsoid, its largest axis (E-W) is approximately 3.7 km long, and the shortest (N-S) is 2.5 km. Inside the lagoon, there are two islands: the Ilha do Farol and Ilha do Cemitério, which comprehend 7.2 Km² of emerged area. The Atol das Rocas lodges 143,000 birds, mainly by Sula dactilatra, S. leucogaster, Anous stolidus, A. minuta and Sterna fuscata. Due to their remote location, the islands remain largely undisturbed by the human activities....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atol das Rocas; Entomological fauna of islands; Trophic niche.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200013

Characterization of the internal reproductive organs and their state as diapause indicator in Phytalus sanctipauli Blanchard, 1850 (Coleoptera, Scarabaeidae)
Provedor de dados: 57
Autores: DIEFENBACH,LÚCIA M. GUEDES; REDAELLI,LUIZA RODRIGUES; GASSEN,DIRCEU NERI.
The internal reproductive organs of females and males of Phytalus sanctipauli are described and illustrated. The amount of fat body in the abdominal cavity was assessed. The remaining in the soil, from March to September, of sexually immature females and males bearing the abdominal cavity totally filled with fat body characterized the state of diapause in this species, in Coxilha (52°20'W and 28°05'S), RS, Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phytalus sanctipauli; Wheat white grub; Diapause; Internal reproductive organs; Fat body.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300019

Feeding pattern of Salminus maxillosus (Pisces, Characidae) at Cachoeira das Emas, Mogi-Guaçu River (São Paulo State, Southeast Brazil)
Provedor de dados: 57
Autores: ESTEVES,K. E.; PINTO LÔBO,A. V.
Diet of 364 specimens of the dourado (Salminus maxillosus) was studied monthly at Cachoeira das Emas from November/1996 to May/1998, considered the breeding ground of this and other migrant fishes of Mogi-Guaçu River. Only adults were found at this site, and diet consisted exclusively of fish, with predominance of Leporinus sp. Seasonal variation in feeding activity was highest during some months of the rainy and hot season (September-December), when fish composition and number of prey species consumed also changed. These modifications were primarily attributed to an increase in food availability at the site of study during the rainy season, once most of the migrant species, including small Characidae concentrate there at this time of year. Apparently diet...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Salminus maxillosus; Feeding; Mogi-Guaçu River; Prey availability.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200009

Editorial note
Provedor de dados: 57
Tipo: Info:eu-repo/semantics/other
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200001

The male genital accessory gland complex of the cattle tick Boophilus microplus (Canestrini, 1887) (Acari: Ixodidae)
Provedor de dados: 57
Autores: GARCIA-FERNANDEZ,CASIMIRO; GARCIA,SONIA M. LAUER DE; GARCIA,ROSANE NUNES.
A topographical and histological study of the male genital accessory gland complex of Boophilus microplus was undertaken. Ten lobes were found, the most prominent of which is the single dorso-median lobe, subdivided into antero-dorsal and postero-dorsal lobes. The other lobes are: a pair of postero-ventral lobes, a pair of lateral lobes (subdivided into dorso-lateral and postero-lateral lobes), a pair of antero-ventral lobes, a single medio-ventral lobe and a pair of latero-ventral lobes. These lobes were observed to present individual topographical and histological characteristics, with independent openings, hence the conclusion is that they form a gland complex. The secretory nature of the dorso-median lobe duct was also analysed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Male reproductive system; Genital accessory glands; Ticks; Ixodidae.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000300010

Morphological description of the developmental stages of Parauchenipterus galeatus (Linnaeus, 1766) (Siluriformes, Auchenipteridae) on the floodplain of the upper Paraná River
Provedor de dados: 57
Autores: SANCHES,P. V.; NAKATANI,K.; BIALETZKI,A.
We provide morphological and morphometric descriptions of the developmental stages of Parauchenipterus galeatus, from the floodplain of the Upper Paraná River. Specimens were obtained by induced spawning. The species has large adhesive eggs with a double membrane. The incubation period is long, 65 hours at 27°C. The larvae are well developed at hatching, with relatively rapid larval development. Analysis of the morphometric data showed that the body parts of P. galeatus grow proportionately.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Morphological development; Parauchenipterus galeatus; Larvae and juveniles; Floodplain; Paraná River.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000300007

Trichogloea requienii (Montagne) Kützing (Rhodophyta: Liagoraceae) no litoral do Brasil
Provedor de dados: 57
Autores: MOURA,C. W. N.; CORDEIRO-MARINO,M.; GUIMARÃES,S. M. P. B.
O presente trabalho cita a ocorrência de Trichogloea requienii no litoral da Bahia, nordeste do Brasil. O gênero é caracterizado por apresentar calcificação moderada na região entre os filamentos assimiladores (córtex) e medula, células mães dos espermatângios dispostas em verticilos sobre as células subterminais corticais, carpogônio localizado no final do filamento assimilador e desenvolvimento de filamentos estéreis curtos nas células inferiores do ramo carpogonial. São apresentadas descrição e ilustração detalhadas do táxon, além da comparação com entidades afins. Esta é a primeira citação do gênero para o Atlântico Sul.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rhodophyta; Liagoraceae; Taxonomia; Trichogloea.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100019

Pollinators of Oxypetalum (Asclepiadaceae) in Southeastern Brazil
Provedor de dados: 57
Autores: VIEIRA,M. F.; SHEPHERD,G. J.
Floral visitors of seven species of Oxypetalum were registered in Viçosa, State of Minas Gerais. O. appendiculatum, O. banksii subsp. banksii, O. alpinum var. alpinum and O. pachyglossum are pollinated by wasps, being Polybia ignobilis (Vespidae) a pollinator of these four species. It seems that P. ignobilis promotes interspecific pollinations mainly between O. alpinum var. alpinum and O. pachyglossum, two species with very similar floral morphology. O. jacobinae, O. mexiae and O. subriparium are pollinated by bees. Wasps and bees carry one, two, three or several pollinaria in the mouthparts. O. mexiae, an endemic species in Viçosa, seems to present reproductive limitations, since its flowers are seldom visited.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bees; Interspecific pollination; Oxypetalum; Polybia; Wasps.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400018

Phytophilous Chironomidae (Diptera) and other macroinvertebrates in the ox-bow Infernão Lake (Jataí Ecological Station, Luiz Antônio, SP, Brazil)
Provedor de dados: 57
Autores: TRIVINHO-STRIXINO,S.; CORREIA,L. C. S.; SONODA,K.
Infernão Lake, located within the Jataí Ecological Station in Luiz Antônio Municipal district (São Paulo State, Brazil), is one of the most typical ox-bow lake of the Mogi-Guaçu River, and it presents, as the main feature, its great quantity of aquatic macrophytes, whose intensive development, in the last years practically covered the whole mirror of water. With the purpose to point out the composition and to establish the relative participation of the phytophilic zoocoenosis that inhabits the different macrophytes of that lake, a collection program of the main vegetation stands was established. The collections, were carried out randomly, during dry season (1994), in stands of Salvinia auriculata, Utricularia sp., Cabomba piauhyensis, Eichhornia azurea and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chironomidae (Diptera); Aquatic macroinvertebrates; Aquatic phytofauna.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300018

Competição larval em Chrysomya megacephala (F.) (Diptera: Calliphoridae): efeitos de diferentes níveis de agregação larval sobre estimativas de peso, fecundidade e investimento reprodutivo
Provedor de dados: 57
Autores: VON ZUBEN,C. J.; STANGENHAUS,G.; GODOY,W. A. C.
Em insetos que se utilizam de substratos discretos e efêmeros para a alimentação e postura de ovos, o resultado da competição larval por alimento depende da quantidade de recursos e da distribuição espacial dos imaturos nos substratos alimentares. No presente estudo, os resultados da competição larval por alimento em Chrysomya megacephala, em caracteres como peso de fêmeas, fecundidade e investimento reprodutivo, foram diferentes em situações em que o nível de agregação larval (proporção de competidores por quantidade de alimento) é o mesmo, mas com densidades de competidores e quantidades de alimento proporcionalmente diferentes. Esses resultados indicam que a competição larval pode depender tanto da densidade larval como da quantidade de alimento, em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chrysomya megacephala; Fecundidade; Peso de fêmeas; Agregação larval; Investimento reprodutivo.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000200002

Adaptação do índice de integridade biótica usando a comunidade de peixes para o rio Paraíba do Sul
Provedor de dados: 57
Autores: ARAÚJO,F. G.
Uma adaptação do Índice de Integridade Biótica (IIB) utilizando a comunidade de peixes foi realizada para um dos trechos mais críticos do Rio Paraíba do Sul, entre Barra Mansa e Barra do Piraí, visando à obtenção de um padrão de monitoramento biológico que permitisse inferir a qualidade da água de maneira segura, robusta e independente de variações a curto prazo. Um programa de amostragens mensais padronizadas foi realizado, entre março de 1995 e fevereiro de 1996, em quatro locais de coletas (Barra Mansa, Volta Redonda, Pinheiral e Barra do Piraí), todos situados junto à embocadura de riachos tributários, onde foram realizadas as pescarias sistematizadas com idêntico esforço, utilizando rede picaré, tarrafas e peneiras. O Índice de Integridade Biótica...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rio Paraíba do Sul; Integridade biótica; Peixes; Poluição.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081998000400002

Sentinels in Saltator atricollis (Passeriformes: Emberizidae)
Provedor de dados: 57
Autores: RAGUSA-NETTO,J.
I studied the existence of sentinels in Saltator atricollis in a 'campo-cerrado' (Brazilian savanna) during the breeding seasons of 1994-95 and 1995-96. Groups of this species consisted of two to seven birds (N = 25). Sentinels were present (mean ± sd) 62% ± 9% of the time, and most sentinel bouts lasted from less than one to six minutes (although in some occasions for more than 30 min.). Overlap of two or more sentinels occurred on average only 3.2% of the time with birds on guard. Sentinels commonly gave contact calls in the beginning and/or at the end of a sentinel bout. The group size had no effect on time with sentinels. However the encounter rate between raptors and groups significantly influenced the time guarded. The results of this study suggests...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Emberizidae; Brazilian savanna; Raptors; Alertness; Sentinels.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200015

Thermal ecology and activity patterns of the lizard community of the Restinga of Jurubatiba, Macaé, RJ
Provedor de dados: 57
Autores: HATANO,F. H.; VRCIBRADIC,D.; GALDINO,C. A. B.; CUNHA-BARROS,M.; ROCHA,C. F. D.; VAN SLUYS,M.
We analyzed the thermal ecology and activity patterns of the lizard community from the Restinga of Jurubatiba, Rio de Janeiro, Brazil. The broadest activity was that of Tropidurus torquatus, a sit-and-wait forager, while the active foraging teiid Cnemidophorus littoralis had the shortest activity. The nocturnal gekkonid Hemidactylus mabouia was found active during the day only during early morning and late afternoon, when environmental temperatures are low. Body temperature was highest for Cnemidophorus littoralis and lowest for the two Mabuya species. The patterns found here are discussed and compared to those of congeneric species in other habitats in Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Thermal ecology; Lizard community; Activity patterns; Restinga habitat.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200011

Application of deterministic model of isothermals for population dynamics of Synthesiomyia nudiseta (Diptera, Muscidae)
Provedor de dados: 57
Autores: ALMEIDA,J. R. de; OLIVEIRA,S. G. de; BORGES,I. L.; D'ALMEIDA,J. M.
The isothermal deterministic model adherence was studied to evaluate the population dinamic of Synthesiomyia nudiseta (Diptera, Muscidae). The linear form of equation obtained for the experiments in the several phases, were for Egg: 1/D = -0.18 + 0.02 . T; Larva: 1/D = -0.028 + 0.01. T; Pupa: 1/D = -0.069 + 0.01 . T; and Adult: 1/D = -0.4178 + 0.02 . T. In function of temperature, S. nudiseta can present from 4.18 to 8.95 and from 4.91 to 8.99 generations per year, when calculated through the equations of development and through the simulations, respectively. And the higher the temperature the larger the generation number. Through variance analysis it was verified the significance for the regression equations in relation to the annual generation number...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Deterministic model; Population dynamics; Synthesiomyia nudiseta; Diptera.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100018

Growth of the annual fish Cynopoecilus melanotaenia (Regan, 1912) based in a temporary water body population in Rio Grande do Sul State, Brazil (Cyprinodontiformes, Rivulidae)
Provedor de dados: 57
Autores: ARENZON,A.; PERET,A. C.; BOHRER,M. B. C.
The growth of the annual fish Cynopoecilus melanotaenia was studied in its natural environment, in order to obtain information about its biology. A total of 797 specimens of C. melanotaenia were collected on a monthly basis between April 1994 and March 1995 in a temporary water body, located in Rio Grande do Sul State, Brazil. The growth curve in total length suggests, to both sexes, a fast initial growth. Males present a smaller growth rate than females, but they attain a higher average maximum length than the females.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Annual fish; Growth; Cynopoecilus melanotaenia; Brazil.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100015

Microbial respiration and chemical composition of different sediment fractions in waterbodies of the upper Paraná River floodplain, Brazil
Provedor de dados: 57
Autores: THOMAZ,S. M.; PEREIRA,G.; PAGIORO,T. A.
Four size fractions of the sediment of six environments of the upper Paraná River floodplain were analyzed for carbon, nitrogen, and phosphorus contents and microbial respiration (oxygen consumption). Particle size did not affect nitrogen and phosphorus content or microbial activity, but did affect carbon content (F = 4.274, df = 3; 20, p = 0.020). The carbon concentration of ultra-fine particles was significantly lower than that of other sizes of sediment particles. Microbial respiration values were well predicted by sediment chemical composition, as shown by multiple regression (microbial respiration = -0.39 - 0.210C + 0.108N + 0.796P; F = 7.0495, p = 0.0022). However, phosphorus was the element which best explained the microbial respiration (partial...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Microbial respiration; Nutrient cycling; Floodplain; Sediment fractions; Paraná River.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200010

Variation of density, species composition and dominance of Rotifers at a shallow tropical reservoir (Broa reservoir, SP, Brazil) in a short scale time
Provedor de dados: 57
Autores: RODRÍGUEZ,M. P.; MATSUMURA-TUNDISI,T.
Rotifers are the predominant group of zooplankton found in the majority of reservoirs, constituting more than 60% of the total zooplankton present. Being opportunistic organisms, they easily adapt to changes in environmental conditions, and it is therefore difficult to establish a constant level of composition and occurrence of a species in specific areas at specific times. In order to establish how changes in composition and predominance of a species occurs within a dynamic system, the daily variation in the total density of rotifers and that of the dominant species were studied at short intervals during a period of 20 days at Lobo (Broa) reservoir. Filinia pejleri and Keratella americana were the predominant species, making up 64.3% of the total...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Density; Composition; Dominance; Rotifers; Reservoir.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100002

Reproductive mechanisms in a Nasutitermes species (Isoptera: Termitidae)
Provedor de dados: 57
Autores: BUSCHINI,M. L. T.; LEONARDO,A. M. C.
The number of reproductive individuals present in colonies of Nasutitermes sp. was analysed, and its possible reproductive strategy discussed. Twenty-four nests were collected and opened, and a single queen and king were found in 17 of them. In the other 7 nests, no queen or king were neither found, nor any other reproductive individual. All quee ns were weighed, and the number of eggs laid by them was counted. No relationship between the volume of the nests and the weight of their respective queens was found, but the number of eggs laid by the queens during an hour was positively correlated to their weight .
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Nasutitermes; Isoptera; Termitidae; Reproduction; Polygyny.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000400010

Diurnal bird visiting of Caryocar brasiliense Camb. in Central Brazil
Provedor de dados: 57
Autores: MELO,C.
Nectar of nocturnal flowers may be used by diurnal species that occasionally accomplish secondary pollination. Thirteen bird species visited Caryocar brasiliense flowers in central Brazil. There is a temporal separation between nectarivores and non-nectarivores species. Nectarivores birds visited flowers late in the morning, while other species appear earlier. C. brasiliense nectar may be an alternative resource to birds visitors during the dry season.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Birds; Caryocar brasiliense; Nectar; Resource.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000200014

Improvement of silver impregnation technique (Protargol) to obtain morphological features of protists ciliates, flagellates and opalinates
Provedor de dados: 57
Autores: SILVA-NETO,I. D. da.
The research on ciliates, flagelates and opalinates have been widespread by the utilization of techniques employing silver impregnation (Protargol), modified by several authors. However, these are time consuming and its results are variable. The present work is a variant of the technique described by Tuffrau (1964, 1967) showing some adaptations made in our laboratory. The organisms can be preserved by different fixatives (alcoholic Bouin, Stieve's fluid, 2.5% glutaraldehyde and others) and then rinsed in destilled water followed by a fast clarification by 3% sodium hypochloride. If the organism is very sensitive to hypochloride, 4% sodium lauryl sulfate may be used and then washed 3 times in distilled water. The protista can be adhered to the glass slides...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Impregnation of protists; Protargol; Technique improvement.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000300010

Melipona garbage bees release their cargo according to a Gaussian distribution
Provedor de dados: 57
Autores: KERR,A. S.; KERR,W. E.
Worker bees of Melipona compressipes and Melipona scutellaris (Meliponinae, Apidae) colonies, involved in carrying garbage to the outside of the nest, dump each individual load cargo of cocoon pellets (cocoon + larval feces + remaining wax). For Melipona scutellaris they weight a mean of 27.8 mg, and are dropped at a distance of 1 to 45 m and between 1 and 35 m for M. compressipes, according to a Gaussian Distribution. In the case of M. scutellaris the expression is: &lt;img src="http:/img/fbpe/rbbio/v59n1/a15e1.gif"&gt; where, N(x) = number of pellets; Exp = e elevated to the expression in brackets; x = distance in meters; the linear term (bx) describes accidental cargo slipping. The constants for the observed data are: b = 0.69; A = 1363; sigma = 2.16 m;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Stingless bees; Melipona scutellaris; Melipona compressipes; Garbage bees; Gaussian Distribution; Garbage release.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000100015

O Banco de sementes de um trecho de uma floresta Atlântica montana (São Paulo - Brasil)
Provedor de dados: 57
Autores: BAIDER,C.; TABARELLI,M.; MANTOVANI,W.
Durante a regeneração da floresta tropical, após perturbações naturais ou antrópicas, o banco de sementes do solo está envolvido no estabelecimento de grupos ecológicos e na restauração da riqueza de espécies lenhosas. Para a análise da composição de espécies do banco de sementes de um trecho de floresta Atlântica madura, no Sudeste do Brasil, foram coletadas 57 amostras de solo, distribuídas aleatoriamente em 2 ha, totalizando 28.500 cm³ de solo coletado. Durante um período de 17 meses germinaram 497 sementes, 65% distribuídas entre 0 e 2,5 cm de profundidade, totalizando 872 sementes/m². O banco de sementes dessa floresta caracterizou-se pela presença de dois componentes: o herbáceo, composto por 66 morfotipos, pertencentes a famílias ricas em espécies...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Banco de sementes; Espécies pioneiras; Floresta Atlântica; Melastomataceae; Regeneração.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71081999000200014

Growth of Nile tilapia Oreochromis niloticus fed with different levels of alcohol yeast
Provedor de dados: 57
Autores: MEDRI,V.; PEREIRA,G. V.; LEONHARDT,J. H.
Two hundred and forty 45-day-old fingerlings of Nile tilapia (Oreochromis niloticus), sexually reverted with an initial average weight of 1.25 ± 0.14 g, distributed in a totally casualized delineation, during 330 days. The effect of the substitution of 10%, 20% and 30% of the ration by distillery yeast (Saccharomiyces cerevisae) in balanced experimental rations on the development in the breeding of tilapias did not show a harmful effect up to the maximum tested level of 30%, showing that the choice of the yeast in the ration for these fishes depends on the availability and occasional cost. The yeast provides fish with good resistance to unfavorable environmental conditions, which could be verified since there were no statistical differences among the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Yeast; Oreochromis niloticus; Ration; Tilapia.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000100014