期刊
BEHAVIORAL ECOLOGY AND SOCIOBIOLOGY
卷 50, 期 1, 页码 90-95出版社
SPRINGER-VERLAG
DOI: 10.1007/s002650100328
关键词
vigilance; group size; interindividual proximity; howler monkeys
Animals are expected to reduce per capita vigilance with increasing group size. Widespread support for this expectation has been found in studies of birds and ungulates. Primate vigilance patterns appear to differ, but studies of primates may have sampled groups with too many members to detect intergroup differences in vigilance. We tested this idea by measuring individual vigilance rates in wild black howler monkeys (Alouatta pigra) living in stable groups of two to ten individuals. No group size effect on vigilance emerged. As in previous studies, inter-individual proximity explained variation in individual vigilance rates. Focal animals with associates within 2 m and with multiple associates in the same tree were less vigilant than isolated animals. Activity and class of focal animals as well as the presence of neonates influenced the average vigilance of adult and subadult black howler monkeys. We conclude that functional explanations must be considered for the general lack of a group size effect on primate vigilance.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据