Macroinvertebrados bentônicos associado à folhiço em um riacho com influência agropecuária, no município de Capanema, PR

Abstract

The occupation of soils and the removal of ciliary forest on the banks of streams and rivers in the Capanema, PR, from the time of colonization to the present day, have caused sedimentation of water courses, altering the availability of this resource in the region, the quality of the habitat of aquatic fauna and flora, especially macroinvertebrates. Thus, this study evaluated the process of colonization and succession in foliage by benthic macroinvertebrates in Arroio Caixãozinho stream, municipality of Capanema. In this work the community of benthic macroinvertebrates of the creek was sampled using traps containing dry leaves for 32 days. The collections were carried out weekly from August to September 2017. For the physical and chemical variables of water, dissolved oxygen and electrical conductivity were the ones that varied most in the sample period. The fauna of macroinvertebrates was poor and dominated by Chironomidae, evidencing the poor quality of the creek. As for the colonization process, most invertebrates, with the exception of Chironomidae alone, colonized the substrate, but do not remain, demonstrating that there is no clear succession. The results evidenced the agricultural influence of the environment that added to the discontinuous presence of the ciliary forest negatively affect the taxon diversity of benthic macroinvertebrates in Arroio Caixãozinho stream.