期刊
BEHAVIORAL ECOLOGY
卷 20, 期 3, 页码 624-632出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/beheco/arp040
关键词
coalitions; mammals; mutual tolerance; sociality
资金
- National Science Foundation Predoctoral Fellowship
- American Indian Science and Engineering Society Environmental Protection Agency Scholarship
- Sigma Xi
- American Society of Mammalogists Grant
- American Museum of Natural History Theodore Roosevelt Memorial Grant
- University of California Los Angeles Eugene Cota-Robles Fellowship
- UCLA Graduate Summer Research Mentorship
- UCLA Holmes Miller Fellowship
- UCLA Bartholomew Research Grant
Coalitions occur when multiple individuals cooperate against a common opponent or for a common goal. Coalition formation is a complex behavior, typically described in highly social and cognitively complex species. Surprisingly, we know little about the social and environmental factors that may select for the evolution of coalitions. We studied the evolution of coalitionary behavior by first redefining it in a continuous way that acknowledges variation in the degree to which animals collaboratively work toward a common goal. We then examined the evolutionary association of coalition complexity with 3 social factors (estrous duration, group size, and presence of a dominance hierarchy) and 3 environmental factors (habitat type, diurnality, and diet type). We found that estrous duration, group size, and dominance hierarchy were significantly correlated with coalition complexity and thus conclude that social factors are relatively more important in the evolution of complex coalitions than are environmental factors. From these results, we infer that complex coalitions may be the product of social factors that reduce female monopolizability and encourage the aggregation of multiple males.
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