Abstract
Aim: The aim of this study was evaluate the influence of river-lake connectivity on Cladocera diversity; Methods: Sampling of macrophyte stands of three oxbow lakes were carried out between August/04 and September/06 every two months; Results: A total of 49 Cladocera species were identified. Three are new records for the state. The Chydoridae family was the most representative, with 34 species. In lakes 1 and 2, Chydoridae and Macrothricidae were the most abundant taxa, while Chydoridae and Daphniidae were the most representative groups in lake 3. Abundance and species richness tended to be greater in lakes 1 and 2; Conclusions: In the oxbow lakes, the environmental variations conditioned by annual dry and rainfall cycles favored a greater diversity of Cladocera, since a greater connectivity with the Taquari River produces constant disturbances that are detrimental to the diversity of this group.
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