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SOME PHYSICAL AND CHEMICAL METHODS FOR THE INVESTIGATION
METHODS FOR THE INVESTIGATION OF THE OPEN WATER ZONE
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accurate acid alcohol algae algal amount animals apparatus attached Aufwuchs bacteria biological bottle bottom grab calculated carbon dioxide catch chamber chironomid chlorophyll Cladocera closed collected colour copepods counted Crustacea cultures cylinder daphnias degree of saprobic depth determined detritus diameter distilled water distribution dredge drop-weight Elster epilimnion estimation fauna filter Fix and preserve flask formalin funnel gauze ground water growth horizontal Hydrobiol hydrobiology hyporheic indicator organisms individual investigation Kolkwitz lake larvae layer Limnol limnology littoral zone live measuring mesh width method microscope millilitre nannoplankton nets nutrient obtained oxygen particles periphyton photosynthesis phytoplankton pipette plankton plankton content plankton organisms plants population primary production procedures profundal zone quantitative region river rotifers running water Ruttner saprobic saprobic conditions sediment shore shovels sieve solution species stones stream substrate surface taken temperature tube vertical vessel volume washed water sample water-bottle whole sample zooplankton