Sperm competition: linking form to function.(Research article)(Report)

Although several theories regarding the evolution of sperm size exist [for reviews see [1, 2]], there is a general assumption in the literature on sperm competition that selection will favour males with longer sperm, due to their enhanced swimming velocity and therefore competitiveness. This assumption rests broadly on three observations. First, a number of comparative studies have reported that sperm are on average longer in polyandrous species ...

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