Time allocation and the evolution of group size

被引:54
|
作者
Pollard, Kimberly A. [1 ]
Blumstein, Daniel T. [1 ]
机构
[1] Univ Calif Los Angeles, Dept Ecol & Evolutionary Biol, Los Angeles, CA 90095 USA
基金
美国国家科学基金会;
关键词
evolution of sociality; group size; independent contrast; phylogeny; primate; temporal constraint; time budget;
D O I
10.1016/j.anbehav.2008.08.006
中图分类号
B84 [心理学]; C [社会科学总论]; Q98 [人类学];
学科分类号
03 ; 0303 ; 030303 ; 04 ; 0402 ;
摘要
Group size is a core trait de. ning social systems, social complexity and social structure, so understanding group-size evolution is critical to understanding the evolution of sociality. Traditional views of group-size evolution focus on ecological factors such as predation risk and physical resources, but the additional factor of time has remained largely unexplored. Time is a valuable limited resource for all animals, and its partitioning both is influenced by sociality and may constrain sociality. Time allocation may in fact be an important mechanism through which predation risk, resource needs and other factors influence the evolution of group size. Classic group-size and time-use hypotheses make no consistent evolutionary predictions, so comparative analyses are necessary to determine which of the predicted processes are active on broad evolutionary scales. To evaluate these predictions, we conducted a comparative study using 50 species of diurnal primates as a model taxon for cohesive group-living animals. The evolution of group size was correlated with time spent resting, even after controlling for life-history variables such as body mass and diet type. We suggest that constraints on time allocation should be better integrated into models of the causes and consequences of sociality and that these constraints may have implications for conservation. (C) 2008 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:1683 / 1699
页数:17
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