THE INFLUENCE OF EUTROPHICATION ON DEEP LAKE BENTHIC INVERTEBRATE COMMUNITIES

摘要: ABSTRACT Some case histories of eutrophication in deep lakes are given. They include the Vattern, Mlaren, Constance, Geneva, Maggiore, Mergazzo, Taho, The Great Lakes, and Okanagan Lakes. Common for nearly all is that first reaction to consists an increase absolute relative abundance oligochaetes without any change species composition. Also sphaeriids, large crustaceans chironomids will numbers. Secondly there a shift common species. Only may possibly be eliminated from profundal zone when strongly oligotrophic lake less lake. sphaeriids show broader trophic spectrum although shifts significant, composition mesotrophic stage approached. More significant take place littoral zone. Lists characteristic different levels 15 subdivisions communities can delineated. There highly correlation between chlorophyll a/mean depth total phosphorous/mean depth. These correlations while it easy benthic ultraoligotrophic moderately communities, takes considerably higher primary production mesotrophic, or eutrophic communities. deeper larger needed order level expected discrepancies evalustions based on epilimnetic algal biomass those invertebrate