Observational evidence that maladaptive gene flow reduces patch occupancy in a wild insect metapopulation

Timothy E. Farkas, Tommi Mononen, Aaron A. Comeault, Patrik Nosil

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)

Abstract

Theory predicts that dispersal throughout metapopulations has a variety of consequences for the abundance and distribution of species. Immigration is predicted to increase abundance and habitat patch occupancy, but gene flow can have both positive and negative demographic consequences. Here, we address the eco-evolutionary effects of dispersal in a wild metapopulation of the stick insect Timema cristinae, which exhibits variable degrees of local adaptation throughout a heterogeneous habitat patch network of two host-plant species. To disentangle the ecological and evolutionary contributions of dispersal to habitat patch occupancy and abundance, we contrasted the effects of connectivity to populations inhabiting conspecific host plants and those inhabiting the alternate host plant. Both types of connectivity should increase patch occupancy and abundance through increased immigration and sharing of beneficial alleles through gene flow. However, connectivity to populations inhabiting the alternate host-plant species may uniquely cause maladaptive gene flow that counters the positive demographic effects of immigration. Supporting these predictions, we find the relationship between patch occupancy and alternate-host connectivity to be significantly smaller in slope than the relationship between patch occupancy and conspecific-host connectivity. Our findings illustrate the ecological and evolutionary roles of dispersal in driving the distribution and abundance of species.

Original languageEnglish
Pages (from-to)2879-2888
Number of pages10
JournalEVOLUTION
Volume70
Issue number12
DOIs
Publication statusPublished - 1 Dec 2016
MoE publication typeA1 Journal article-refereed

Keywords

  • Connectivity
  • eco-evolutionary dynamics
  • extinction
  • gene flow
  • maladaptation
  • metapopulation

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