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1 April 2003 VIVIPARITY AS A CONSTRAINT ON SEX-RATIO EVOLUTION
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Abstract

In polytocous mammals, the sex ratio during gestation can influence a variety of morphological, physiological, and life-history traits because of steroid leakage between fetuses. Similar phenomena have also recently been described for a viviparous lizard. Some of these effects have important fitness consequences by influencing reproductive success later in life. Thus, biasing the sex ratio toward one sex may lead to a decreased fitness for the other sex, and therefore constrain the evolution of skewed sex ratios. By incorporating effects of sex ratio on offspring fitness in a simple sex-allocation model, I show that, under some circumstances (1) skewed sex ratios are predicted to evolve, and (2) this cost can constrain the evolution of skewed sex ratios.

Tobias Uller "VIVIPARITY AS A CONSTRAINT ON SEX-RATIO EVOLUTION," Evolution 57(4), 927-931, (1 April 2003). https://doi.org/10.1554/0014-3820(2003)057[0927:VAACOS]2.0.CO;2
Received: 26 October 2002; Accepted: 26 November 2002; Published: 1 April 2003
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