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A genetic interpretation of ecologically dependent isolation.

H D Rundle1, M C Whitlock

  • 1Department of Zoology and Centre for Biodiversity Research, University of British Columbia, Vancouver, Canada. rundle@zoology.ubc.ca

Evolution; International Journal of Organic Evolution
|March 27, 2001
PubMed
Summary

Ecological speciation requires demonstrating that hybrids have reduced fitness due to environmental mismatches, not just genetic incompatibilities. New models show reciprocal transplant experiments must include backcrosses to distinguish these isolation mechanisms.

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Area of Science:

  • Evolutionary biology
  • Speciation research
  • Quantitative genetics

Background:

  • Hybridization can lead to reduced fitness through ecological niche divergence or intrinsic genetic incompatibilities.
  • Ecologically dependent isolation is a key prediction of ecological speciation models, distinct from intrinsic genetic isolation.

Purpose of the Study:

  • To determine if experimental designs can adequately detect ecologically dependent isolation.
  • To expand a quantitative genetic model to incorporate parental environments and assess hybrid fitness.

Main Methods:

  • Developed an expanded quantitative genetic model incorporating two parental environments.
  • Analyzed the model to identify experimental designs for estimating environment-specific genetic effects in hybrids.

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Main Results:

  • Reciprocal transplant experiments using backcrosses in both parental environments can estimate environment-specific additive genetic effects and correct for intrinsic isolation.
  • Including F1 and F2 generations allows estimation of environment-specific dominance effects.
  • Comparing only F1s or F2s to parental species is insufficient to differentiate ecological from intrinsic isolation.

Conclusions:

  • Reduced hybrid fitness alone does not prove ecological speciation.
  • Accurate assessment of speciation mechanisms necessitates disentangling genetic and ecological contributions to hybrid fitness.