1. Polsko-Norweski Fundusz Badań Naukowych / Polish-Norwegian Research Fund Benthic invertebrates in lakes Małgorzata Gołub (IOŚ) Jacek Koszałka (UWM) Paweł Prus (IRŚ) Warszawa, 10.02.2011

2. Polsko-Norweski Fundusz Badań Naukowych / Polish-Norwegian Research Fund Quick overview: Littoral invertebrates: Hydromorphological alterations Eutrophication Profundal invertebrates: Eutrophication Comparison of 3 methods of assessment based on: Integrated samples - CPET: Eutrophication No national method of assessment Warszawa, 10.02.2011

3. Polsko-Norweski Fundusz Badań Naukowych / Polish-Norwegian Research Fund CPET Ecological assessment based on two metrics: Warszawa, 10.02.2011 Index CPET (Ruse 2010) Average tolerance score per taxon (+) Well tested / all WFD-required aspects of community included (-) Too sensitive to taxa richness (problem: mixed level of determination) % Chironomidae Proportion of taxa tolerant to oxygen deficiency Corrects samples with high taxa richness

4. Polsko-Norweski Fundusz Badań Naukowych / Polish-Norwegian Research Fund CPET Ecological status - class boundaries: Warszawa, 10.02.2011 Lake TypeReference value Boundaries StratifiedMedian from reference sites Equidistant division of the EQR gradient PolymicticBest of existing (H/G) Equidistant division of the EQR gradient

5. Polsko-Norweski Fundusz Badań Naukowych / Polish-Norwegian Research Fund CPET WB classification: Warszawa, 10.02.2011 Stratified Kielpinskie3 Dabrowa Wielka3 Dabrowa Mala4 Lidzbarskie4 Rumian4 Tarczynskie5 Polymictic Hartowieckie4 Zarybinek3 Grady5 Zwiniarz4 too stringent (database consists of mainly v. good lakes) method is planned to intercalibrate by June 2011 (UK, IR)

6. Polsko-Norweski Fundusz Badań Naukowych / Polish-Norwegian Research Fund Warszawa, 10.02.2011 CPET Some uncertainty attempts: Temporal variability Not applicable – integrated sample Main source of variability Surveyor error Not applicable – done by one person Sorting error Not applicable – done by one person

7. Polsko-Norweski Fundusz Badań Naukowych / Polish-Norwegian Research Fund Warszawa, 10.02.2011 CPET Spatial variability Two lakes surveyed in additional stations Kielpinskie Kielpinskie Lake: mean = 0.59; SD = 0.03 Lidzbarskie Lake: mean = 0.24; SD = 0.04 Ecological class - not changed