1. Multilevel selection in a gradient
- Author
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Valleriani, Angelo and Meene, Torsten
- Subjects
- *
POPULATION dynamics , *POPULATION , *EVOLUTIONARY theories , *GROUP selection (Evolution) , *ECOLOGY , *COLONIZATION , *INTERNAL migration - Abstract
Abstract: In this study we consider a population subdivided in groups. Each group is connected to two neighboring groups by means of migration channels. The migration channels are used with different probability, according to a gradient that gives a preferential direction of colonization. Within groups we have a fast population dynamics modeled with a Moran process. Between groups we have a process of colonization selection at low migration rate, based on the propagule model. We consider resident and invading individuals, with the invading individuals having a relative fitness r. Groups composed only of invaders will also have a relative group fitness R. We show that, independently of the value of r, a strong gradient reduces the advantage of groups with large fitness and thus works against group selection. [Copyright &y& Elsevier]
- Published
- 2007
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