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This strategy can be more effective because it may allow the male to engage in both extra-pair paternity and within-pair paternity. Journal of Theoretical Biology. Evolutionary biology Evolutionary psychology Sexual selection Semen. Post-feeding bubbling behaviour in fluidfeeding Diptera. Female crickets Teleogryllus oceanicus appear to use post-copulatory mechanisms to avoid producing inbred offspring. The results were interpreted as egg-driven sperm selection against related sperm. He will then drive away any males that come near and this will greatly increase his chances of copulation with any female that comes to that area. When mated to both a sibling and an unrelated male, females bias paternity towards the unrelated male. 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. Proceedings of the National Academy of Sciences.

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Description: Journal of Theoretical Biology. Testis weight, body weight and breeding system in primates, Nature Views Read Edit View history. Males will invest more in ejaculation when competitors are in the immediate environment of the female. Lizard Social Behavior. Another strategy, known as sperm partitioning, occurs when males conserve their limited supply of sperm by reducing the quantity of sperm ejected. R. Pizzari, Tommaso Relationships across species between the frequency of multiple mating by females and male testis size are well documented across many groups of animals. Regarding sexual dimorphism among primates, humans falls into an intermediate group with moderate sex differences in body size but relatively large testes. In polygynous relationships, the dominant male of the community benefits because he has the best fertilization success. The molecular basis of the evolution of sex. This strategy can be more effective because it may allow the male to engage in both extra-pair paternity and within-pair paternity. Journal of Evolutionary Biology. However, inbreeding avoidance mechanisms that operate subsequent to copulation are less well known. An adequate diet consisting of increased amounts of diet and sometimes more specific ratio in certain species will optimize sperm number and fertility.
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