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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Habitat structure and stream fishes in a pasture basin, São Paulo, Brazil

Full text
Author(s):
Ferreira, Cristiane de P. ; Casatti, Lilian [2]
Total Authors: 2
Document type: Journal article
Source: Revista Brasileira de Zoologia; v. 23, n. 3, p. 642-651, set. 2006.
Field of knowledge: Biological Sciences - Zoology
Abstract

Four stream stretches (sites 1-4) in a pasture area of the northwestern São Paulo state were studied, aiming to examine the composition and quantitative structure of the ichthyofauna and investigate its relation with habitat features. Fishes were collected during the three most representative months of the dry and wet periods by one electrofishing pass in each month. Chemical water quality analysis showed good conditions in all sites, whereas physical habitat integrity analysis showed poor conditions to the sites 2 and 3 and fair to the sites 1 and 4. Twenty seven fish species were collected for a total of 1241 specimens and 5,1 kg. The quantitative structure of the ichthyofauna revealed closer association with habitat structure than to seasonality because sites 1 and 2 were split from sites 3 and 4, independently of the season. According to the canonical correspondence analysis, the higher abundance of Gymnotus carapo Linnaeus, 1758 in the sites 1 and 2 was associated to marginal vegetation abundance, the abundance of Piabina argentea Reinhardt, 1867 in the site 3 was explained by the habitat volume, and the abundance of Hypostomus nigromaculatus (Schubart, 1964) in the site 4 was related to the rocky substrate predominance. (AU)

FAPESP's process: 01/13340-7 - Evaluation of the biotic integrity of the rivers of the northwest region of the State of São Paulo, Alto Paraná basin, using communities of fish
Grantee:Lilian Casatti
Support type: BIOTA-FAPESP Program - Young Investigators Grants
FAPESP's process: 03/09612-7 - Communities of fish and biotic integrity of the strewam of clean water, basin of the rio São José dos Dourados, SP, in the pre-recuperation phase of the riparian forest
Grantee:Cristiane de Paula Ferreira
Support type: Scholarships in Brazil - Master