Planktonic algae, other than desmids, of three Amazonian systems (Lake Batata, Lake Mussurá and Trombetas River), Pará, Brazil

The phytoplankton composition of three clear-water Amazonian environments (Lakes Batata and Mussurá and Trombetas River) is presented. The results are based on 319 samples collected during one year. 136 of the 228 taxa recorded are described, except desmids which have been treated elsewhere. Lake Batata showed higher species richness (188) than both Lake Mussurá (139) and the Trombetas River (116), the Chlorophyceae and Zygnemaphyceae being best represented. Lower species richness was recorded in the area of Lake Batata influenced by bauxite tailings, when compared to the natural (non-impacted) area