The effects of sperm competition
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Epigenetic Effects Of Sperm Competition
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Metabolic rate limits the effect of sperm competition on
The latter effect is a consequence of males seeking extra-pair copulations after their own pair copulation period has ended. Typically, two males mating with the same female in immediate succession sire similar numbers of offspring. Archives of Sexual Behavior. Men prefer to have as low of a sperm competition risk as possible, and they therefore tend to choose short-term sexual partners who are not in a sexual relationship with other men. Sperm competition experiments in the laboratory show that last male sperm precedence occurs as it does in many other taxa although the mechanism is unknown as in most other taxa. Human reproduction Sexual selection. The size of the sperm midpiece is determined in part by the volume of mitochondria in the sperm. Learning and other common psychological processes presumably evolved because they contribute to reproductive fitness, but reproductive outcomes are rarely measured in psychology experiments. Without non-monogamous mating of females, sperm competition would not exist in humans. Even within ejaculates, sperm have adopted different morphologies. The female orgasm has been suggested as such an adaptation. The interaction between functional and mechanistic approaches to sperm competition and between male and female perspectives are described and illustrated by a study of the zebra finch, Taeniopygia guttata. Proceedings of the Royal Society B. The volume of sperm in ejaculates scales proportionately with testis size and, consistent with the intermediate weight of human males testis, ejaculate volume is also intermediate between primates with high and low levels of sperm competition.
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