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Sex ratio variability in a laboratory colony of large toothed redbacked voles clethrionomys rufocanus rufocanus and the trivers willard hypothesis

, : Sex ratio variability in a laboratory colony of large toothed redbacked voles clethrionomys rufocanus rufocanus and the trivers willard hypothesis. Ekologiya (Moscow) (5): 73-79

The variability of the secondary sex ratio in large-toothed redbacked voles from a laboratory colony was studied. Although the total sex ratio for all litters was approximately 1:1, in the progeny of some females a definite excess of sons or daughters was observed in accord with the Trivers-Willard hypothesis. However, the differential mortality of embryos of different sexes and the correlation between a female's weight and the sex ratio in her progeny-both anticipated on the basis of the hypothesis-were not observed.

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