Title

The adaptive value of male-biased sex ratios in stressed animals

Document Type

Journal article

Source Publication

American Naturalist

Publication Date

10-1984

Volume

124

Issue

4

First Page

597

Last Page

599

Publisher

University of Chicago Press

Abstract

The question of adaptive sex ratio manipulation in higher vertebrates remains a controversial issue. Trivers and Willard (1973) proposed that facultative adjustment of the sex ratio could be adaptive when the mother can produce an excess of the more profitable sex. They emphasized that "natural selection should favor parental ability to adjust the sex ratio of their offspring according to their ability to invest" (p. 90). Generally, it has been assumed that strong mothers invest more per offspring, and should preferentially produce males in species with polygynous or promiscuous mating systems. Conversely, it has been assumed that weak females invest less per offspring, and should therefore bias their offspring sex ratio toward females.

Print ISSN

00030147

E-ISSN

15375323

Publisher Statement

Copyright © 1984 University of Chicago Press. Access to external full text or publisher's version may require subscription.

Full-text Version

Publisher’s Version

Recommended Citation

McGinley, M. A. (1984). The adaptive value of male-biased sex ratios in stressed animals. American Naturalist, 124(4), 597-599. Retrieved from http://www.jstor.org/stable/2461600