Abstract
While the possession of a helmet ap pears to be advantageous to many species of Daphnia as an antipredator device in summer, the fact that this structure is absent in spring suggests that during this time its formation is disadvantageous. Both helmeted and round‐headed individuals of Daphnia retrocurva occur simultaneously in Heney Lake, Quebec, in late May. Round‐headed individuals have significantly larger clutch sizes than do helmeted ones of the same carapace length at this time. The reproductive disadvantage of being helmeted seems to select for the round‐headed form in spring, when food levels are high and predation pressure is low.
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