The effects of sperm competition

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Sperm competition occurs among sperm after they are released from the male. Parker 2in Sperm BiologyPublisher Summary Sperm competition is the competition between the ejaculates of different males for the fertilization of a given set of ova. Journal of Evolutionary Biology. Conversely, men of low mate value with poorer quality ejaculates may invest more in mate guarding because they are at a greater risk of having their mate defect from the relationship. Sperm competition in fishes: Aspects of spider reproductive biology such as the existence of cryptic female choice and sperm competition have lead to this group been the focus of studies into the importance of sexual selection in diversification and speciation reviewed by Eberhard, ; Gage et al.

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This result suggests that sperm production is costly and may be more costly for smaller males.

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All three sperm quality variables were run independently in General Linear Models GLM with all lifestyle and collection variables from the Lifestyle Survey and Ejaculate Questionnaire included. For example, work on fishes has shown that male expenditure on mate guarding comes at a cost of reduced expenditure on the ejaculate with the consequence that female fertility is reduced [69]. These effects were found independent of lifestyle factors or factors related to male quality. At this early stage of studies of quantitative genetics of sperm, it is important to focus on specific characteristics of sperm or female reproductive tracts that influence sperm performance, and to determine if these traits are the property of an individual or require an interaction for their expression. Even if hybrid survival appears to be equivalent to pure species survival, it is possible that hybrid or pure species individuals fare poorly in mixed assemblages.

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