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| Mazzoni,Rosana; Nery,Lívia Lourenço; Iglesias-Rios,Ricardo. |
| No presente trabalho tivemos como objetivo descrever as variações espaço-temporais e ontogenéticas da dieta de Astyanax janeiroensis do Rio Ubatiba, um riacho costeiro da Serra do Mar. Analisamos o conteúdo gástrico de 540 exemplares capturados mensalmente, durante 12 meses, em seis localidades, sendo três com cobertura (localidade fechada) vegetal e três sem cobertura (localidade aberta). Verificamos que A. janeiroensis é uma espécie onívora, com dieta essencialmente baseada em itens autóctones, majoritariamente de origem vegetal. O coeficiente intestinal da espécie foi estimado em 0,74 (+ 1,2) que é um valor compatível com o hábito alimentar onívoro. Não foram registradas diferenças na dieta dos exemplares coletados durantes as estações seca e chuvosa.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Alimentação; Ontogenia; Characiformes; Omnivoro. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000300005 |
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| Mazzoni,Rosana; Araújo,Raphaella Rangel da Silva; Santos,Gardênia Carolina Tosta dos; Iglesias-Rios,Ricardo. |
| In the present work, we determined the relative importance of allochthonous and autochthonous food items as well as seasonal and ontogenetic variation in the feeding habits of Phalloceros anisophallos from córrego Andorinha, Ilha Grande. Quantitative analysis, based on alimentary index (IAi) and food volume (Vo), revealed that P. anisophallos fed on detritus, autochthonous algae (diatoms, unicellular and filamentous Chlorophyceae algae), autochthonous animals (aquatic insect larvae: Trichoptera, Chironomidae and other Diptera) and allochthonous animals (terrestrial insects: Hymenoptera). Ontogenetic variations were recorded for the consumption of each food category. Adults used a larger amount of algae and detritus, and juveniles used a higher amount of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Poeciliidae; Atlantic Rain Forest; Coastal stream; Ontogeny; Seasonality. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000100021 |
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| Mazzoni,Rosana; Pinto,Miriam Plaza; Iglesias-Rios,Ricardo; Costa,Raquel. |
| ABSTRACT Given the importance of fish movement to the dynamics and maintenance of stream dwelling fish communities from the Atlantic Forest, we analysed patterns of fish movement in a coastal stream from Southeastern Brazil, using mark-recapture technique. Displacement distance of each species were presented and discussed considering seasonal (rainy and dry) and body size patterns. We marked 10 species along the stream and recaptured 440 (34.6%) of the 1,270 marked fishes. The species with significant number of upstream moving individuals were Astyanax janeiroensis, Characidium interruptum, Astyanax hastatus, Parotocinclus maculicauda and Awaous tajasica. Only Pimelodella lateristriga presented significant differences between resident and moving... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coastal stream; Migration; Reproduction; Stream dwelling fish. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000100206 |
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| Mazzoni,Rosana; Novaes,Vitor Considera; Iglesias-Rios,Ricardo. |
| The size-related microhabitat use of Phalloceros harpagos Lucinda, 2008 from Mato Grosso stream (Saquarema - RJ) was examined. We analyzed, during 8.3 h of underwater observation, a 200 m long reach in the upper Mato Grosso stream, quantifying the following microhabitat descriptors: (i) distance from the stream bank, (ii) water column depth, (iii) occurrence on riffle, pool or run mesohabitat, (iv) water velocity, (v) substratum, and (vi) subaquatic vegetal cover. Microhabitat selectivity was analyzed by comparing the microhabitat used by fish and the microhabitat available in the study site. Complementary analyses, based in the Ivlev Electivity Index were applied in order to test selectivity for the microhabitat use. We did not found differences in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Focal position; Mata Atlântica stream; Subaquatic observations. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300020 |
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