Abstract
SUMMARY (1) Food assimilation efficiency (AE) was determined by feeding a known number of labelled (32p) copepods of various sizes to the 4th instar larvae of Chaoborus trivittatus. (2) At 24 ?C AE was nearly constant at about 80% for all meal sizes, but at other temperatures it decreased from 91.2 to 86.5% for meal sizes of 0.10 to 0.50 1l, and varied from 75.8%0 at 16 ?C to 52% at 6 ?C for a meal size of about 0.90 d1. (3) Further feeding by a larva (often resulting in an emptying of the gut after a starvation period) can reduce these estimates by 5-10%. The importance of these results to optimal foraging theory is discussed.
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