Fluctuations and dispersal rates in population dynamics

David A. Kessler, Leonard M. Sander

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Dispersal of species to find a more favorable habitat is important in population dynamics. Dispersal rates evolve in response to the relative success of different dispersal strategies. In a simplified deterministic treatment of two species which differ only in their dispersal rates the slow species always dominates. We demonstrate that fluctuations can change this conclusion and can lead to dominance by the fast species or to coexistence, depending on parameters. We discuss two different effects of fluctuations and show that our results are consistent with more complex treatments that find that selected dispersal rates are not monotonic with the cost of migration.

Original languageEnglish
Article number041907
JournalPhysical Review E
Issue number4
StatePublished - 6 Oct 2009


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