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R Andrzejewski Kazimierz Petrusewicz 23 March 190626 March 1982
distribution of molluscs with special consideration to Dreissena polymorpha Pall 761
G Maku le c Enchytraeidae Oligochaeta of forest ecosystems L Density biomas and production
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a j a k aestival analysis ash-alder carr average basin Bedze biomass blue-green algae body weight bottom sediments catchment areas characteristics of lakes Chironomidae chlorophyll coefficient cohort concent ration concentration content of total cotyledons Crustacea Cyclopoida density dimictic lakes distribution ecosystems Ekol enchytraeids epilimnion eutrophic fertile lakes fosforu gatunków Geranium robertianum growing season growth H a r p e r herb layer heterospecific flocks highest Impatiens noli-tangere increase individuals jezior jeziorach Juno lakes examined lakes in north-eastern Mały mg dm molluscs nitrogen north-eastern Poland versus number of species nutrients oak-hornbeam forest occurred oligochaeta phytocoenosis phytoplankton pine forest plankton plants Poland Polish summary polymictic lakes population production regenerating samples seed bank seedlings soil species combinations sphagnetorum spring structure stwierdzono Table Tilio-Carpinetum tion total phosphorus trophic trophic gradient trophic groups versus their trophic w s k i Wobel z d a zooplankton