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| Registros recuperados: 235 | |
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| 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 < 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 |
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| 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 < 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| Registros recuperados: 235 | |
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