title: Group living, competition, and the evolution of cooperation in a sessile invertebrate.
abstract: 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.
authors.forename: L W
authors.initials: LW
authors.lastname: Buss