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t║ a k u le c Enchytraeidae oligochaeta of for
R Andrzejewski Kazimierz Petrusewicz 23 March 190626 March 1982
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a j a k ash-alder carr average basin biomass bottom sediments catchment areas characteristics of lakes Chironomidae chlorophyll Cladocera concent ration concentration content of total cotyledons Cyclopoida density diaspores dimictic lakes distribution ecosystems Ekol enchytraeids epilimnion eutrophication fosforu gatunkˇw Geranium robertianum growing season growth herb layer heterospecific flocks hypolimnion Impatiens noli-tangere increase individuals jezior jeziorach Jorzec Juno lakes examined lakes in north-eastern mictic types molluscs nitrogen north-eastern Poland versus number of species nutrient ║ ║ oak-hornbeam forest occurred ogˇlnego Oligochaeta period phytocoenosis phytoplankton Piłakno pine forest plankton plants Poland Polish summary polymictic lakes population putris regeneration rotifers samples sediments seed bank seedlings ſ║ soil sphagnetorum spring structure summer Sztumskie Table Tilio-Carpinetum tion total nitrogen total phosphorus trophic trophic gradient trophic groups versus their trophic weight Wobel zooplankton