Takahata Yukio, Koyama Naoki, Ichino Shinichiro, Miyamoto Naomi, Nakamichi Masayuki, Soma Takayo
School of Policy Studies, Kwansei Gakuin University, 2-1 Gakuen, Sanda, 669-1337, Japan.
Primates. 2008 Apr;49(2):135-8. doi: 10.1007/s10329-007-0076-8. Epub 2007 Dec 22.
We used data from a 13-year field study of wild ringtailed lemurs to analyze the relationship between female rank and reproductive parameters. In medium and small groups there were no significant differences in birth rate, infant mortality rate, and the number of surviving infants between the female rank categories. On the other hand, in large sized groups low-ranked females had a smaller number of surviving infants than middle-ranked females. This suggests that in large sized groups, within-group competition lowered the values of reproductive parameters of low-ranked females. On the other hand, high and low-ranked females of small sized groups tended to have a smaller number of surviving infants than high-ranked females of medium sized groups and middle-ranked females of large sized groups. Between-group competition should lower the values of their reproductive parameters. In sum, these results fit the expectation from Wrangham's (1980) inter group feeding competition model.
我们利用对野生环尾狐猴进行的一项为期13年的实地研究数据，来分析雌性等级与生殖参数之间的关系。在中小型群体中，不同雌性等级类别之间的出生率、婴儿死亡率和存活婴儿数量没有显著差异。另一方面，在大型群体中，低等级雌性的存活婴儿数量比中等等级雌性少。这表明在大型群体中，群体内部竞争降低了低等级雌性的生殖参数值。另一方面，小型群体中的高等级和低等级雌性的存活婴儿数量往往比中型群体中的高等级雌性和大型群体中的中等等级雌性少。群体间竞争应该会降低它们的生殖参数值。总之，这些结果符合弗兰汉姆（1980年）的群体间觅食竞争模型的预期。
