Longitudinal distribution of Chironomidae (Diptera) downstream from a dam in a neotropical river

Brazilian Journal of Biology

Gd. Pinha¹  D. Aviz¹  Dr. Lopes Filho¹  Dk. Petsch¹  Mr. Marchese¹  Am. Takeda¹ 

关键词: Diptera larvae;    Neotropical region;    substrata;    hydroelectric power plant;    upper Paraná River;    larvas de Diptera;    região Neotropical;    substrato;    hidrelétrica;    rio Paraná;   

DOI  :  10.1590/S1519-69842013000300013

来源: SciELO

【 摘 要 】

The damming of a river causes dangerous consequences on structure of the environment downstream of the dam, modifying the sediment composition, which impose major adjustments in longitudinal distribution of benthic community. The construction of Engenheiro Sérgio Motta Dam in the Upper Paraná River has caused impacts on the aquatic communities, which are not yet fully known. This work aimed to provide more information about the effects of this impoundment on the structure of Chironomidae larvae assemblage. The analysis of data of physical and chemical variables in relation to biological data of 8 longitudinal sections in the Upper Paraná River showed that composition of Chironomidae larvae of stations near Engenheiro Sérgio Motta Dam differed of the other stations (farther of the Dam). The predominance of coarse sediments at stations upstream and finer sediments further downstream affected the choice of habitat by different morphotypes of Chironomidae and it caused a change in the structure of this assemblage in the longitudinal stretch.

【 授权许可】

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