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| Registros recuperados: 235 | |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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... |
| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 235 | |
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