Abstract
The swimming behavior of Daphnia pulex was compared between two temperatures (5 and 25°C), with two acclimation protocols, using three‐dimensional video techniques. Our hypotheses, based on Stokes’ law and metabolic considerations, predicted large changes in swimming behavior. However, free‐swimming individuals did not follow Stokes’ law. They sank slower than predicted, having increased their sinking rate by ∼23% from 5 to 25°C. Anesthetized Daphnia followed Stokes’ law, showing an increase in sinking rate of 70% over the temperature range. The Q10 values of all swimming behaviors were between 0.91 and 1.11 (which are significantly less than Q10 values for metabolic rates) and were nearly uniform over a 20°C range. Our results also indicate that acclimation to different temperatures for 1 h is sufficient to minimize acclimation effects.
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