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The risk of sperm competition and the evolution of sperm heteromorphism
Animal Behaviour, 1998Members of the Drosophila obscura species group exhibit sperm heteromorphism in which males simultaneously produce two different morphologies of sperm, short and long. Short sperm represent at least 50% of the ejaculate in several species but do not function in fertilization and thus, the evolutionary significance of this phenomenon is unknown ...
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Sperm in competition: not playing by the numbers
Trends in Ecology & Evolution, 2005The outcome of sperm competition is mediated largely by the relative numbers of sperm from competing males. However, substantial variation in features of sperm morphology and behaviour, such as length, longevity and motility, exists and researchers have suggested that this variation functions in postcopulatory sexual selection.
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Testes, Sperm, and Sperm Competition
2009Robert Montgomerie, John Fitzpatrick
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Sperm competition, male prudence and sperm-limited females
Trends in Ecology and Evolution, 2002Nina Wedell +2 more
exaly