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Understanding Animal Group-Size Distributions
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Population and Conservation Biology.
Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Mathematics, Analysis and Applied Mathematics.
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2011 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 6, no 8, e23438- p.Article in journal (Refereed) Published
Abstract [en]

One of the most striking aspects of animal groups is their remarkable variation in size, both within and between species. While a number of mechanistic models have been proposed to explain this variation, there are few comprehensive datasets against which these models have been tested. In particular, we only vaguely understand how environmental factors and behavioral activities affect group-size distributions. Here we use observations of House sparrows (Passer domesticus) to investigate the factors determining group-size distribution. Over a wide range of conditions, we observed that animal group sizes followed a single parameter distribution known as the logarithmic distribution. This single parameter is the mean group size experienced by a randomly chosen individual (including the individual itself). For sparrows, the experienced mean group size, and hence the distribution, was affected by four factors: morning temperature, place, behavior and the degree of food spillage. Our results further indicate that the sparrows regulate the mean group size they experience, either by groups splitting more or merging less when local densities are high. We suggest that the mean experienced group size provides a simple but general tool for assessing the ecology and evolution of grouping.

Place, publisher, year, edition, pages
2011. Vol. 6, no 8, e23438- p.
National Category
Biological Sciences
URN: urn:nbn:se:uu:diva-159483DOI: 10.1371/journal.pone.0023438ISI: 000294678300004OAI: oai:DiVA.org:uu-159483DiVA: diva2:445330
Available from: 2011-10-03 Created: 2011-10-03 Last updated: 2012-02-16Bibliographically approved

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