Advantages and a disadvantage of large size for male gammarus pulex (Crustacea: Amphipoda)

  title={Advantages and a disadvantage of large size for male gammarus pulex (Crustacea: Amphipoda)},
  author={Paul I. Ward},
  journal={Behavioral Ecology and Sociobiology},
The breeding system of the freshwater amphipod Gammarus pulex includes a precopulatory guarding phase by a male. The length of this guarding phase is investigated with respect to a male's size and the number and size of his competitors. As the absolute number of competitors increases, so does the guarding time but as the absolute number of available females increases, the guarding time decreases. Takeovers of the females by unpaired males are more frequent in longer precopulas (Table 2). In… CONTINUE READING
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