Natural selection drives the link between male immune function and reproductive potential

被引:10
作者
Fedorka, KM
Zuk, M
Mousseau, TA
机构
[1] Univ Calif Riverside, Dept Biol, Riverside, CA 92521 USA
[2] Univ S Carolina, Dept Biol, Columbia, SC 29208 USA
来源
CANADIAN JOURNAL OF ZOOLOGY-REVUE CANADIENNE DE ZOOLOGIE | 2005年 / 83卷 / 07期
关键词
D O I
10.1139/Z05-095
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
In the ground cricket Allonemobius socius (Scudder 1877), males provide females with a hemolymph-based nuptial gift. The size of the gift depends on when copulation is terminated, which can be controlled by either sex. Here we show that more immunocompetent males provide larger nuptial gifts, increasing their reproductive potential. To address if this pattern was the consequence of sexual selection for an honest signal (i.e., females assess mate immune quality through the hemolymph), we examined which sex controlled gift size. We found that the probability that males initiated the end of copulation increased when gift size was small (stereotypical of less immunocompetent males). Thus, early termination of copulation was the consequence of male behavior, suggesting that the association between immunocompetence and gift size was not due to sexual selection, but to natural selection for male vigor.
引用
收藏
页码:1012 / 1014
页数:3
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