Adaptive dispersal strategies and the dynamics of a range expansion

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108 Scopus citations

Abstract

In species undergoing range expansion, newly established populations are often more dispersive than older populations. Because dispersal phenotypes are complex and often costly, it is unclear how highly dispersive phenotypes are maintained in a species to enable their rapid expression during periods of range expansion. Here I test the idea that metapopulation dynamics of local extinction and recolonization maintain distinct dispersal strategies outside the context of range expansion. Western bluebirds display distinct dispersal phenotypes where aggressive males are more dispersive than non-aggressive males, resulting in highly aggressive populations at the edge of their expanding range. I experimentally created new habitat interior to the range edge to show that, as on the range front, it was colonized solely by aggressive males. Moreover, fitness consequences of aggression depended on population age: aggressive males had high fitness when colonizing new populations, while nonaggressive males performed best in an older population. These results suggest that distinct dispersal strategies were maintained before range expansion as an adaptation for the continual recolonization of new habitat. These results emphasize similarities between range expansion and metapopulation dynamics and suggest that preexisting adaptive dispersal strategies may explain rapid changes in dispersal phenotypes during range expansion.

Original languageEnglish (US)
Pages (from-to)S4-S17
JournalAmerican Naturalist
Volume172
Issue numberSUPPL. 1
DOIs
StatePublished - Jul 1 2008
Externally publishedYes

Keywords

  • Aggression
  • Dispersal polymorphism
  • Environmental heterogeneity
  • Kin cooperation
  • Sialia

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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