||Energetics of 'Daphnia Ambigua'.
Armitag, Kenneth B. ;
||Kansas Water Resources Research Inst., Manhattan.
||Contrib-129; DI-14-31-0001-3516; OWRR-A-043-KAN; 06831,; A-043-KAN(1)
Plant ecology ;
Oxygen consumption ;
Phosphorus inorganic acids ;
Daphnia ambigua ;
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The population cycle of the zooplankton D. ambigua was followed in a one hectare pond at the University of Kansas. D. parvula and D. pulex also occur in the same pond. D. ambigua predominates during the colder season from November through early June when water temperatures are below 20C. The population peak of D. ambigua in May is followed by that of D. pulex and then D. parvula. Growth of D. ambigua was measured under field and laboratory conditions. Both the time of egg development to hatching and of first instar to adult were slower at lower environmental temperatures. Gross photosynthetic rate, seston concentration, and chlorophyll a concentration were determined as measures of food available to the daphnid populations.