Sperm cell fighting
Performed the experiments: SL. The authors confirm that all data underlying the findings are fully available without restriction. In species where females mate with multiple males, the sperm from these males must compete to fertilise available ova. Sexual selection from sperm competition is expected to favor opposing adaptations in males that function either in the avoidance of sperm competition by guarding females from rival males or in the engagement in sperm competition by increased expenditure on the ejaculate. The extent to which males may adjust the relative use of these opposing tactics has been relatively neglected.
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This page has been archived and is no longer updated. Published online 29 July Nature doi Hannah Wunsch. What happens when sperm from two different males meet up? Is there all-out war, or do they live in harmony? Females in many animal groups have multiple mates - often close enough together in time to cause the sperm to mix. Just how does it manage this feat?
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A sperm's quest to fertilize an egg is not easy. Of the roughly million sperm ejaculated into the human vagina during intercourse, fewer than one in a hundred will survive the perilous trek up the hostile, acidic chamber to the cervix. If the female is set to ovulate soon, the cervix will allow the frisky, foreign interlopers inside.