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Population Viscosity and the Evolution of Altruism

✍ Scribed by JOSHUA MITTELDORF; DAVID SLOAN WILSON

Publisher: Elsevier Science
Year: 2000
Tongue: English
Weight: 920 KB
Volume: 204
Category: Article
ISSN: 0022-5193
DOI: 10.1006/jtbi.2000.2007

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✦ Synopsis

The term population viscosity refers to limited dispersal, which increases the genetic relatedness of neighbors. This e!ect both supports the evolution of altruism by focusing the altruists' gifts on relatives of the altruist, and also limits the extent to which altruism may emerge by exposing clusters of altruists to sti!er local competition. Previous analyses have emphasized the way in which these two e!ects can cancel, limiting the viability of altruism. These papers were based on models in which total population density was held "xed. We present here a class of models in which population density is permitted to #uctuate, so that patches of altruists are supported at a higher density than patches of non-altruists. Under these conditions, population viscosity can support the selection of both weak and strong altruism.

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