Abstract
We examined the variation in relative testis size among northern populations of Peromyscus to test if mice from populations with shorter breeding seasons had larger testes than mice from populations with longer breeding seasons. If natural selection on relative testes size in mammals is ultimately due to copulatory frequency and if sperm production is limited, then a decrease in the number of days in which a constant number of matings occurs should promote selection for larger testes. Relative testis size (testis length/body length) significantly varied among 10 populations of P. maniculatus and three populations of P. leucopus
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