Responses of the zooplankton community to the formation of a small reservoir on the Caveiras River, southern Brazil

We investigated changes in the species richness, abundance, and composition of zooplankton community response to formation a small reservoir Caveiras River, southern Brazil. Zooplankton were collected using motor-pump plankton net (68 ?m mesh), with 600 L water filtered per sample. Sampling occurred during pre- (April, August, December 2011) post-impoundment (July October 2013, January 2014) phases River. identified 86 taxa this study, rotifers predominant group. The richness abundance increased after filling reservoir. Furthermore, showed clear change between before reservoir, emergence typical planktonic species. Changes structure related limnological characteristics due impoundment river, mainly availability food concentration nutrients.