Daphnia magna, Daphnia pulex, Daphnia parvula, and Daphnia laevis respond to small temperature changes by changing the duration and frequency of upward swimming, in proportion to the rate of change of temperature. When temperature rises, animals swim up more frequently in direct proportion to the rate of change of temperature. In falling temperatures, the animals tend to sink. This response is opposite to previously reported reactions of zooplankton to heating or cooling. It may be adaptive in light‐initiated vertical migration by reinforcing upward swimming in ascending animals and by reinforcing sinking in descending animals.
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Jeroen Gerritsen (1982) studied this question.