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Journal Article

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
DOI: 10.2307/2954
Stable URL: http://www.jstor.org/stable/2954
Page Count: 17
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Feeding, Assimilation and Respiration Rates of Daphnia magna Under Various Environmental Conditions and their Relation to Production Estimates
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Abstract

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.

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