Influence of agricultural land-use and pesticides on benthic macroinvertebrate assemblages in an agricultural river basin in southeast Brazil

Brazilian Journal of Biology

M Egler¹  Df. Buss¹  Jc. Moreira²  Df. Baptista¹ 

[1] ,Fundação Oswaldo Cruz Escola Nacional de Saúde Pública Sergio Arouca Rio de Janeiro RJ ,Brazil

关键词: stream ecosystems;    water quality;    macroinvertebrates;    biomonitoring;    agricultural river basins;    ecossistemas de rios;    qualidade da água;    macroinvertebrados aquáticos;    biomonitoramento;    áreas agrícolas;   

DOI  :  10.1590/S1519-69842012000300004

来源: SciELO

【 摘 要 】

Land-use alterations and pesticide run-offs are among the main causes for impairment in agricultural areas. We evaluated the influence of different land-uses (forest, pasture and intensive agriculture) on the water quality and on benthic macroinvertebrate assemblages on three occasions: in the dry season, wet season and at the end of the wet season. Macroinvertebrates responded to this gradient of impairment: agricultural sites had significantly lower richness numbers than forested and pasture sites, and all major invertebrate groups were significantly affected. Most taxa found in forested sites were found in pasture sites, but often with lower densities. In this case, the loss of habitats due to sedimentation and the lower complexity of substrates seem to be the disruptive force for the macroinvertebrate fauna.

【 授权许可】

CC BY   
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