哺乳动物的性别比例与同性亲属竞争

Sex ratio and intrasexual kin competition in mammals.

作者信息

Cockburn Andrew, Scott Michelle P, Dickman Chris R

机构信息

Department of Zoology, Australian National University, GPO Box 4, 2601, Canberra, ACT, Australia.

Museum of Comparative Zoology, Harvard University, 01238, Cambridge, MA, USA.

出版信息

Oecologia. 1985 Jun;66(3):427-429. doi: 10.1007/BF00378310.

DOI:10.1007/BF00378310

PMID:28310874

Abstract

Asymmetries in both intrasexual competition and generation overlap occur in Antechinus (Dasyuridae; Marsupialia). We show that the range of interpopulation variation in the sex ratio of pouch young spans and exceeds the range of sex ratios at birth hitherto recorded from eutherians (Clutton-Brock and Albon 1983). Although postweaning dispersal and male mortality are similar among all Antechinus populations, interpopulation variance in female longevity leads to variable duration of mother/daughter interaction. As this duration increases, parental investment is increasingly biased toward males, supporting the view that local competition among female kin for resources may influence mammalian sex ratios.

摘要

袋鼬属（袋鼬科；有袋目）在两性间竞争和世代重叠方面都存在不对称性。我们发现，育儿袋幼崽性别的种群间变异范围跨越并超过了迄今为止从真兽类动物中记录到的出生时的性别比范围（克拉顿 - 布罗克和阿尔邦，1983年）。尽管所有袋鼬属种群断奶后的扩散和雄性死亡率相似，但雌性寿命的种群间差异导致母女互动的持续时间各不相同。随着这种持续时间的增加，亲代投资越来越偏向雄性，这支持了一种观点，即雌性亲属之间对资源的局部竞争可能会影响哺乳动物的性别比。