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A Method for Quantifying Foliage-Dwelling Arthropods
08:20

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Published on: October 20, 2019

Speciation by distance in a ring species.

Darren E Irwin1, Staffan Bensch, Jessica H Irwin

  • 1Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC, Canada V6T 1Z4. irwin@zoology.ubc.ca

Science (New York, N.Y.)
|January 22, 2005
PubMed
Summary
This summary is machine-generated.

Ring species demonstrate speciation despite gene flow. Greenish warblers show distinct genetic differences between isolated populations, with gradual changes in between, supporting "speciation by distance".

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Area of Science:

  • Evolutionary biology
  • Speciation research
  • Population genetics

Background:

  • Ring species are key to understanding speciation, connecting distinct populations through intermediate forms.
  • Previous studies suggested ring species exemplify speciation despite gene flow, but lacked definitive proof.
  • The greenish warbler (Phylloscopus trochiloides) is a model organism for studying ring species dynamics.

Purpose of the Study:

  • To investigate gene flow and genetic divergence in the greenish warbler ring species.
  • To provide empirical evidence for the process of ring species formation.
  • To test the hypothesis of
  • speciation by force of distance
  • .

Main Methods:

  • Utilized amplified fragment length polymorphism (AFLP) markers for genetic analysis.
  • Analyzed genetic variation across the ring of greenish warbler populations.
  • Compared genetic differentiation between reproductively isolated forms and intermediate populations.

Main Results:

  • AFLP markers revealed distinct genetic differences between the two isolated greenish warbler forms.
  • A clear pattern of gradual genetic change was observed along the ring connecting these forms.
  • Evidence of ongoing gene flow was detected throughout the intergrading populations.

Conclusions:

  • The study provides the strongest evidence to date for speciation occurring gradually along a geographic continuum.
  • Greenish warblers exemplify
  • speciation by force of distance
  • in a real-world ring species scenario.
  • This research clarifies the role of gene flow in the formation of new species.