The aim of this study was to describe and classify the food preference of fish species in Passa Cinco stream. The grade of feeding preference was applied to stomachs considered replete. This method consists of attributing values to food items found in certain species, according to the participation of each item in the analysed stomach. We analysed 576 full stomachs of 28 species. The autochthonous insects were the main constituents of the diets of these species, and the majority of ingested items classified as occasional. Allochthonous items such as plant debris, seeds and earthworms were associated with higher-order site. Of the total possible combination pairs of species, 29.4% showed high overlap, which occurred mainly within species that consumed aquatic insect larvae. However, those species showed significant differences in the exploitation of food resources. Omnivory was common, showing the plasticity of the required species that inhabit environments as found in streams.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1590/s1519-69842011000100023 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Composition and structure of fish assemblage from Passa Cinco stream, Corumbataí river sub-basin, SP, Brazil.
Braz J Biol
February 2012
Departamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, Brazil.
The aim of this work was to determine the composition of the fish assemblage of Passa Cinco stream and verify changes in their structure on the altitudinal gradient. Six samples were performed at five different sites in Passa Cinco stream (from the headwater, at order two, to its mouth, at order six), using an electric fishery equipment and gill nets in May, July, September and November of 2005 and January and March of 2006. The indices of Shannon's diversity, Pielou's evenness and Margalef's richness were quantified separately considering the different fishery equipment (nets versus electric fishery equipment).
View Article and Find Full Text PDFFirst karyotype description of Hypostomus iheringii (Regan, 1908): a case of heterochromatic polymorphism.
Comp Cytogenet
November 2013
Universidade Federal de São Carlos, Departamento de Genética e Evolução, Rodovia Washington Luís Km 235, São Carlos-SP, 13565-905, Brazil.
Article Synopsis
- This study is the first karyotype analysis of the fish species Hypostomus iheringii, revealing a diploid chromosome number of 80 in specimens collected from Córrego da Lapa.
- Techniques like silver nitrate staining and fluorescence in situ hybridization (FISH) identified multiple nucleolus organizer regions (NORs) and confirmed the presence of 5S rDNA only on chromosome pair 2.
- Unique variations in heterochromatic regions were found on chromosome pairs 1 and 5, indicating that heterochromatinization may play a key role in the karyotypic differentiation of this species.
Diet of fishes in Passa Cinco stream, Corumbataí River sub-basin, São Paulo state, Brazil.
Braz J Biol
February 2011
Departamento de Produção Vegetal, Centro de Ciências Agrárias, Universidade Federal do Espírito Santo, Alegre, ES, Brazil.
The aim of this study was to describe and classify the food preference of fish species in Passa Cinco stream. The grade of feeding preference was applied to stomachs considered replete. This method consists of attributing values to food items found in certain species, according to the participation of each item in the analysed stomach.
View Article and Find Full Text PDFReproduction of the fish community of Passa Cinco stream, Corumbataí River sub-basin, São Paulo State, southeastern Brazil.
Braz J Biol
February 2010
Departamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP, Brazil.
The aim of this work was to evaluate the reproduction (verifying if there was reproductive activity and, if so, with what intensity) of the most abundant species of the fish community in Passa Cinco stream, in relation to the dry and wet season periods and to the longitudinal gradient, through the application of the reproductive intensity index (RII). The sample collection was carried out during one year with six samplings (May, July, September and November 2005, and January and March 2006) in five different points of Passa Cinco stream, contemplating sites of orders two to six. The following fishery equipment was used: a sieve, electric fishery equipment, gill nets and fish-traps.
View Article and Find Full Text PDFPopulation biology of Trichomycterus sp. (Siluriformes, Trichomycteridae) in Passa Cinco stream, Corumbataí River sub-basin, São Paulo State, southeastern Brazil.
Braz J Biol
August 2009
Departamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista, Rio Claro, SP, Brazil 13506-900.
The aim of this work was to characterise the population of Trichomycterus sp. in Passa Cinco stream, regarding length structure, sex ratio, diet and reproductive aspects, in accordance with drought and rainy season periods and longitudinal gradient, as well as to analyse its corporal condition in a temporal dimension. Six samplings were accomplished with the use of electric fishing equipment in three different sites in Passa Cinco stream, contemplating sites of order two, three and four, during the months of May, July, September and November of 2005; and January and March of 2006.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!