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Cryptic polyandry overt sperm competition

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Try out PMC Labs and tell us what you think. Learn More. The Darwin—Bateman paradigm recognizes competition among males for access to multiple mates as the main driver of sexual selection. Increasingly, however, females are also being found to benefit from multiple mating so that polyandry can generate competition among females for access to multiple males, and impose sexual selection on female traits that influence their mating success.

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Sperm competition

Polyandry as a mediator of sexual selection before and after mating

Sperm competition is the competitive process between spermatozoa of two or more different males to fertilize the same egg [1] during sexual reproduction. Competition can occur when females have multiple potential mating partners. Greater choice and variety of mates increases a female's chance to produce more viable offspring. Sperm competition is an evolutionary pressure on males, and has led to the development of adaptations to increase males' chance of reproductive success. Sperm competition is often compared to having tickets in a raffle ; a male has a better chance of winning i. However, sperm are not free to produce, [7] and as such males are predicted to produce sperm of a size and number that will maximize their success in sperm competition. By making many spermatozoa, males can buy more "raffle tickets", and it is thought that selection for numerous sperm has contributed to the evolution of anisogamy with very small sperm because of the energy trade-off between sperm size and number.

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Polyandry as a mediator of sexual selection before and after mating

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