Abstract
Several factors lead to the deterioration of water quality and destruction of aquatic environments, exerting a profound and negative influence on the structure of fish communities. In this work, the existence of changes in physical and chemical parameters of water, diversity and composition of the fish fauna, resulting from the silting of streams, was investigated in a campinarana vegetational complex in Northwestern Acre State, Brazil. In order to perform the assessments, two stretches of 50 meters were selected from each stream; one with and the other without sedimentation. No significant differences were found in the physical and chemical parameters between silted and non-silted samples. Samples taken from streams influenced by sedimentation showed higher species richness and diversity of fishes than non-silted streams. In addition, a psammophilous species was found as an indicator in silted streams, whereas a bento-pelagic species was an indicator in non-silted streams. Results show the importance to analyse fish community attributes in evaluating the processes of degradation of the aquatic environment by human activities. Keywords: ichthyofauna, Amazon basin, campinarana, turbidity, assemblages.
Highlights
O presente estudo foi realizado em cinco igarapés de água preta localizados no complexo vegetacional de campinarana sobre areias brancas às margens da BR-307, município de Mâncio Lima, estado do Acre, Brasil (Figura 1)
Samples taken from streams influenced by sedimentation showed higher species richness and diversity of fishes than non-silted streams
A psammophilous species was found as an indicator in silted streams, whereas a bento-pelagic species was an indicator in non-silted streams
Summary
O presente estudo foi realizado em cinco igarapés de água preta localizados no complexo vegetacional de campinarana sobre areias brancas às margens da BR-307, município de Mâncio Lima, estado do Acre, Brasil (Figura 1). Impacto do assoreamento sobre a diversidade de peixes em igarapés de um complexo vegetacional de campinarana ríodo de amostragem corresponde ao período chuvoso na região Amazônica, quando os níveis de água dos igarapés de baixa ordem estão elevados e quando o nível de assoreamento é alto devido ao carreamento da areia durante as chuvas. Localização de cinco igarapés amostrados em complexo vegetacional de campinarana no noroeste do estado do Acre, Brasil. Trechos não assoreado (A) e assoreado (B) de um igarapé amostrado em complexo vegetacional de campinarana no noroeste do estado do Acre, Brasil. Os peixes coletados foram identificados até o menor nível taxonômico possível, fixados em formalina 10% e depositados na Coleção Ictiológica da Universidade Federal do Acre
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