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Related Experiment Videos

A multilocus perspective on colonization accompanied by selection and gene flow.

Erica Bree Rosenblum1, Michael J Hickerson, Craig Moritz

  • 1University of California, Berkeley, Berkeley, California 94720, USA. rosenblum@berkeley.edu

Evolution; International Journal of Organic Evolution
|November 3, 2007
PubMed
Summary
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Eastern Fence Lizards rapidly adapted to new habitats like White Sands and Carrizozo lava flows. Colonization caused population size reductions, with adaptation potentially incurring a demographic cost.

Area of Science:

  • Evolutionary biology
  • Population genetics
  • Ecology

Background:

  • Colonization of new environments drives evolutionary change.
  • Understanding demographic impacts of colonization within continuous ranges is crucial.
  • Eastern Fence Lizards (Sceloporus undulatus) exhibit rapid adaptation to novel gypsum and lava habitats.

Purpose of the Study:

  • Investigate demographic consequences of rapid adaptation in novel habitats.
  • Compare genetic signatures of two independent colonization events.
  • Assess the influence of natural selection and gene flow on adaptation.

Main Methods:

  • Analyzed phenotypic variation in lizard color and environmental substrate color.
  • Sequenced mitochondrial DNA and 19 nuclear loci.

Related Experiment Videos

  • Employed Approximate Bayesian Computation (ABC) to infer historical demography.

    • Main Results:

    • Phenotypic variation correlates with environmental variation; neutral genetic variation relates to geographic distance.
    • Both novel habitats experienced historical population size reductions (bottlenecks) post-colonization.
    • Black lava habitats showed more severe population reductions than white sand habitats, possibly due to colonization time and selection intensity.

    Conclusions:

    • Colonization of novel environments, especially with altered selection regimes, leads to significant demographic costs.
    • Adaptation to new habitats can be inferred even with ongoing gene flow.
    • Population recovery post-bottleneck is incomplete in these lizard populations.