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THE AQUATIC ENVIRONMENT
PLANTS AND ANIMALS OF FRESH WATERS
LAKES PONDS AND POOLS
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acid adapted adults algae amounts anaerobic aquatic areas bacteria basin benthic bicarbonate biological body bottom calcium carbon dioxide catchment characteristic chemical chironomid colour communities crustaceans deeper water density deposition depth developed dissolved solids drainage ecology effect energy epilimnion eutrophic fauna feed Figure fish flood flow forms fresh waters freshwater ground water growth habitats hypolimnion important increase insects invertebrates lakes large numbers larvae lentic light littoral Loch lotic macrophytes mainly major marine material methods microhabitats midge natural waters normally nutrients occur oligochaetes oligotrophic organic matter oxygen parasitic particles photosynthesis phytoplankton plankton plants and animals pollution ponds population production profundal protozoans rainfall reservoirs respiration rivers rocks rotifers running waters salts sample sampler sediments seiches shallow silt species standing waters stratification streams substrate suspended solids temperature terrestrial thermocline tropical tube types usually various vary velocity water surface zooplankton