Interactions between benthic macroinvertebrates and fishes in a low order stream in Campos de Cima da Serra, RS, Brazil

Brazilian Journal of Biology

Lt. Winckler-sosinski²  Tcl. Silveira¹  Uh. Schulz¹  A. Schwarzbold¹ 

[1] ,Empresa Brasileira de Pesquisa AgropecuariaPelotas RS ,Brazil

关键词: benthic macroinvertebrates;    low order streams;    predation;    exclusion experiment;    exotic fish;    macroinvertebrados bentônicos;    riachos de baixa ordem;    predação;    experimento de exclusão;    peixe exótico;   

DOI  :  10.1590/S1519-69842008000400003

来源: SciELO

【 摘 要 】

Benthic macroinvertebrates constitute the link between organic matter input in streams and fishes. However, the possibility of influence of predators on the invertebrates is still a controversial issue. The possibility of alteration of the benthic community by the modification in predation in a stream in the South of Brazil was studied by means of an exclusion experiment under semi-natural conditions. The exclusion showed an increase in the abundance of Plecoptera in the river where the rainbow trout was introduced, the larvae of Trichoptera also increased in abundance in the units of fish exclusion. This difference does not confirm the pressure applied by the trout on the benthic macro fauna due to differences in ichthyofauna and in the habitat of both rivers. Nevertheless, it points to the need for the development of studies concerning the trophic relations and the possible effects of this introduction in the aquatic biota.

【 授权许可】

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