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The present study includes data on three biotic communities, characteristic to five lakes from the Roşia Montană region, Transylvania, Romania: primary producers (phytoplanktonic algae) and consumers (planktonic crustaceans and benthic invertebrates). The five sampling sites chosen for this paper were located on five man-made shallow lakes: Tăul Anghel, Tăul Brazi, Tăul Cornii, Tăul Mare and Tăul Ţarinii. The samples were collected in 2009 and 2010. The importance of the present study resides in the scarcity of the data from aquatic ecosystems in this particular area, Roşia Montană, whose fate is disputed between mining companies and environmentalists.

Keywords: benthic invertebrates; ecological status; percentage abundance; phytoplankton, planktonic microcrustaceans.