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Feeding, Assimilation and Respiration Rates of Daphnia magna Under Various Environmental Conditions and their Relation to Production Estimates
D. W. Schindler
Journal of Animal Ecology
Vol. 37, No. 2 (Jun., 1968), pp. 369-385
Published by: British Ecological Society
Stable URL: http://www.jstor.org/stable/2954
Page Count: 17
You can always find the topics here!Topics: Food, Physiological assimilation, Respiration, Animals, Algae, Diet, Regression coefficients, Zooplankton, Production estimates, Radiocarbon
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1. Assimilation and feeding rates of Daphnia magna were determined using 14C-tagged diets. The effects of temperature, animal size, food energy content and concentration, light, motion, crowding and reproductive state were examined. Light, motion and crowding did not affect either assimilation or feeding in the ranges tested. Assimilation rates increased with higher temperature and decreased as animal size increased. Neither temperature nor animal size affected feeding rates significantly. Food concentration and energy content affected both assimilation and feeding rates significantly. 2. Respiration of D. magna was measured using the Winkler method. Respiration rates increased as temperature increased and decreased as animal size increased. 3. Equations for assimilation, feeding and respiration were determined by multiple regression analysis. The linearity of these relationships was tested. Equations were tested by comparing production as predicted from regression analysis with actual production in laboratory populations.
Journal of Animal Ecology © 1968 British Ecological Society