Diversity and Structure of Pelagic Zooplankton (Crustacea, Rotifera) in NE Poland

This study presents the diversity and structure of pelagic zooplankton in north-eastern Poland. The research was conducted 47 lakes with different trophic conditions middle summer. Samples were collected close to deepest part avoid diverse benthic littoral zones. We found 119 species which 32 Cladocera, 16 Cyclopoida, 4 Calanoida, 67 Rotifera. determined occurred most frequently region, as well that characteristic conditions. also recorded presence eight cold-adapted some them are considered glacial relicts (e.g., Eurytemora lacustris, Heterocope appendiculata, Cyclops lacustris). Our revealed potential refugia for planktonic 14 NE suggests stenotherm may be an excellent indicator ecological status deep could lake monitoring programs. Furthermore, we did not find Bythotrephes longimanus has been reported from Instead, B. brevimanus common representative genus area.