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adapted adult animals Anostraca appear aquatic Asterionella autumn auxospore benthic blue-green algae Brachionus brackish Calanoida cells Ceratium Cladocera cochlearis comparable concentration Conchostraca copepods Crustacea culture cycle cyclomorphosis Cyclopoida Cyclotella Daphnia density desmids diatoms dilute Dinobryon distribution ecological epilimnion Eudiaptomus euryhaline eutrophic evidence fauna females FIGURE Fragilaria fresh water fresh-water species genera genus gracilis habitats hatching helmet hypogean hypolimnetic hypolimnion illumination increase indicated instar involved June Keratella known Lake Baikal lakes larvae least less littoral longispina mainly males marine maxima maximum medium Melosira mendotae migration movement nauplii Notostraca number of species nutrient observed occur oligotrophic organisms parthenogenetic phytoplankton plankton ponds population posterior spine present probably produced pulex reduction region relative reproduction resting eggs retrocurva rotifers Ruttner salinity seasonal sinking speed specimens spine length spring stenotherm studied summer surface temperature tion variation vertical Wesenberg-Lund whereas winter zooplankton