Group Living, Competition, and the Evolution of Cooperation in a Sessile Invertebrate

See allHide authors and affiliations

Science  28 Aug 1981:
Vol. 213, Issue 4511, pp. 1012-1014
DOI: 10.1126/science.213.4511.1012


Competition and cooperation are thought to represent the opposite extremes of organism interactions. I here show that the formation of aggregations in a sessile organism requires cooperation between individuals and that the gregarious pattern of habitat selection generating these aggregations is a response to a density dependence in the outcome of interference competition.