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Group-living offers both benefits (protection against predators, access to resources) and costs (increased ecological competition, the impact of group size on fertility). Here, we use cluster analysis to detect natural patternings in a comprehensive sample of baboon groups, and identify a geometric sequence with peaks at approximately 20, 40, 80 and 160. We suggest (i) that these form a set of demographic oscillators that set habitat-specific limits to group size and (ii) that the oscillator arises from a trade-off between female fertility and predation risk.

Original publication

DOI

10.1098/rsbl.2017.0700

Type

Journal article

Journal

Biol Lett

Publication Date

03/2018

Volume

14

Keywords

evolutionarily stable strategy, fertility, fission, predation risk, social organization