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• W2806781064 abstract "ABSTRACT When females mate with multiple partners in a reproductive cycle, the relative number of competing sperm from rival males is often the most critical factor in determining paternity. Gamete production is directly related to testis size in most species, and is associated with both mating behavior within a system and perceived risk of competition. Peromyscus maniculatus is naturally promiscuous and males invest significantly more in sperm production than males of P. polionotus , their monogamous sister-species. Here we show that the relatively larger testes in P. maniculatus are retained, even after decades of enforced monogamy in captivity. While these results suggest that differences in sperm production between species with divergent evolutionary histories can be maintained, we also show that the early rearing environment of males can strongly influence their testis size as adults. Using a second-generation hybrid population to increase variation in testis size, we show that males reared in litters with more brothers develop larger testes as adults. Importantly, this difference in testis size is also associated with increased fertility. Together, our findings suggest that sperm production may be both broadly shaped by natural selection over evolutionary timescales and also finely tuned during early development." @default.
• W2806781064 created "2018-06-13" @default.
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• W2806781064 date "2018-05-28" @default.
• W2806781064 modified "2023-09-23" @default.
• W2806781064 title "Sibling rivalry: Males with more brothers develop larger testes" @default.
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• W2806781064 doi "https://doi.org/10.1101/332775" @default.
• W2806781064 hasPublicationYear "2018" @default.
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