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Gene Flow Complicates Phylogenetic Inference in an Archipelago Radiation.

Ethan F Gyllenhaal1,2,3, Lukas B Klicka4,5, Lucas H DeCicco4

  • 1Department of Biology and Museum of Southwestern Biology, University of New Mexico, 219 Yale Blvd NE, Albuquerque, NM 87131, USA.

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|November 12, 2025
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Summary
This summary is machine-generated.

Geographic barriers influence gene flow between allopatric populations, impacting speciation. This study on Solomons Monarchs reveals gene flow patterns but highlights challenges in disentangling colonization history from phylogenetic inference due to isolation.

Keywords:
ArchipelagoMonarchidaegene flowisland biogeographyphylogeographysimulation

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Area of Science:

  • Evolutionary Biology
  • Biogeography
  • Population Genetics

Background:

  • Allopatric divergence is key to biogeography and community assembly.
  • Gene flow between isolated populations affects adaptation, speciation, and phylogenetic inference.
  • Superspecies offer insights into gene flow's impact on divergence.

Purpose of the Study:

  • Investigate gene flow, population structure, and phylogenetic relationships in the Solomons Monarchs avian superspecies.
  • Characterize the effects of geographic barriers and gene flow on divergence.
  • Address challenges in phylogeographic inference when populations are differentially isolated.

Main Methods:

  • Phylogenetic analyses of the Symposiachrus barbatus complex.
  • Population genetic simulations.
  • Analysis of gene flow patterns influenced by geographic barriers.

Main Results:

  • Gene flow among allopatric Solomons Monarchs aligns with geographic predictions.
  • Phylogenetic relationships contradict a simple stepping-stone colonization model.
  • An isolated island's species appeared sister to all others, challenging colonization history inference.

Conclusions:

  • Low gene flow in isolated populations can bias phylogenetic inference.
  • Distinguishing gene flow from colonization history is a significant challenge in phylogeography.
  • Geographic isolation complicates understanding evolutionary divergence and speciation.