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

Effects of physical habitat degradation on the stream fish assemblage structure in a pasture region

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Author(s):
Casatti, Lilian [1] ; Langeani, Francisco ; Ferreira, Cristiane P. [3]
Total Authors: 3
Affiliation:
[1] Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. Instituto de Biociências, Letras e Ciências Exatas - Brasil
[3] Universidade Estadual Paulista (UNESP). Campus de São José do Rio Preto. Instituto de Biociências, Letras e Ciências Exatas - Brasil
Total Affiliations: 3
Document type: Journal article
Source: Environmental Management; v. 38, n. 6, p. 974-982, Dec. 2006.
Field of knowledge: Biological Sciences - Zoology
Abstract

We compared the fish assemblage structure from streams with different intensities of physical habitat degradation and chemical water pollution by domestic sewage in southeastern Brazil. Eight streams (R1-R8) showing less disturbed or more disturbed conditions of chemical water quality and of physical habitat quality were selected. Cumulative abundance and biomass, combined in ABC plots, revealed a) biomass curves above the abundance curves, represented by the streams R1-R2 (water and habitat less disturbed) and R5-R6 (water more disturbed and habitat less disturbed); and b) biomass curves below the abundance curves, represented by the streams R3-R4 (water less disturbed and habitat more disturbed) and R7-R8 (water and habitat more disturbed). The quantitative structure of the ichthyofauna showed significant correspondence with physical habitat condition but not with chemical water quality. The most significant species to cause the dissimilarity between less disturbed and more disturbed physical habitats was the exotic Poecilia reticulata. Such results indicate that in the focused region-with little influence of industrial pollution, noncritical domestic sewage discharge, and soil predominantly used for pasture-streams with high physical habitat integrity possess a differently structured ichthyofauna than streams with relatively low physical habitat integrity, reinforcing the importance of the physical habitat quality and riparian conservation along these water courses, warranting the conservation of these systems. Indeed, our results also reinforce the importance of including biotic descriptors, particularly of the ichthyo-fauna, in water-monitoring programs designed to reveal signs of human interference. (AU)

FAPESP's process: 03/12893-8 - Food of Knodus moenkhausii (Pisces, Ostariophysi, Characidae), an allochtonous species in streams of the northwest of the State of São Paulo
Grantee:Mônica Ceneviva Bastos
Support type: Scholarships in Brazil - Scientific Initiation
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