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Polygenic adaptation from standing genetic variation allows rapid ecotype formation.

Nico Fuhrmann1, Celine Prakash1, Tobias S Kaiser1

  • 1Max Planck Institute for Evolutionary Biology, Plön, Germany.

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Summary

Marine midges rapidly form new ecotypes through genetic adaptation, even with gene flow. This rapid speciation involves re-assorting existing alleles, particularly in clock and sensory genes.

Keywords:
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Area of Science:

  • Evolutionary biology
  • Genetics
  • Marine ecology

Background:

  • Adaptive ecotype formation is a key step in speciation.
  • The genetic basis of rapid ecotype formation is not well understood.
  • Marine midges (Clunio) in Northern Europe offer a model system for studying post-glacial recolonization and ecotype divergence.

Purpose of the Study:

  • To investigate the genetic underpinnings of rapid adaptive ecotype formation in Clunio marine midges.
  • To understand the role of standing genetic variation in ecotype divergence.
  • To identify genes and genetic processes involved in adaptation to local tide conditions.

Main Methods:

  • Genomic analysis to assess population structure and haplotype sharing.
  • Quantitative Trait Locus (QTL) mapping and genome-wide scans.
  • Analysis of ecotype-associated loci, focusing on circadian clock and sensory genes.

Main Results:

  • Genomic analysis confirmed recent ecotype establishment in Clunio, with significant haplotype sharing.
  • Patterns of polygenic adaptation from standing genetic variation were identified.
  • Key loci associated with ecotype formation included circadian clock genes and genes for sensory perception and nervous system development.

Conclusions:

  • Adaptive ecotype formation can occur rapidly, even with ongoing gene flow.
  • The process relies on the re-assortment of existing genetic variation.
  • Circadian clock and sensory-related genes play a crucial role in rapid adaptation and ecotype differentiation.