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Related Experiment Video

Updated: Jan 5, 2026

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
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Hybridization increases population variation during adaptive radiation.

Peter R Grant1, B Rosemary Grant2

  • 1Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544 prgrant@princeton.edu.

Proceedings of the National Academy of Sciences of the United States of America
|October 30, 2019
PubMed
Summary
This summary is machine-generated.

Introgressive hybridization increased morphological variation in Darwin's finches during adaptive radiation. This gene exchange enhanced trait diversity, potentially boosting future evolution in changing environments.

Keywords:
Darwin’s finchesbeakshybridizationintrogressionspeciation

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Area of Science:

  • Evolutionary Biology
  • Ecology
  • Genetics

Background:

  • Adaptive radiations generate biodiversity through rapid diversification into ecological niches.
  • Introgressive hybridization is hypothesized to drive the generation of new morphologies and species, but its evolutionary role is unclear.

Purpose of the Study:

  • To investigate the role of introgressive hybridization in shaping morphological variation during adaptive radiation.
  • To understand how interspecific gene exchange impacts trait evolution in Darwin's finches.

Main Methods:

  • Utilized a dated phylogeny to infer historical hybridization events and morphological variation trends in Darwin's finches.
  • Conducted a 30-year field study on Daphne Major documenting changes in hybridizing populations of *Geospiza fortis* and *Geospiza scandens*.

Main Results:

  • Morphological variation in Darwin's finch populations increased over time, consistent with hybridization, then declined.
  • *Geospiza scandens* showed greater evidence of admixture than *Geospiza fortis*, with beak shape changes observed.
  • Introgressive hybridization altered ecologically important traits, increasing morphological variation during the radiation.

Conclusions:

  • Introgressive hybridization can significantly alter ecologically relevant traits and enhance morphological variation during adaptive radiations.
  • This process increases the potential for future evolutionary adaptation in response to environmental changes.