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Thomas Blankers1,2,3, Sibelle T Vilaça4,5, Isabelle Waurick2

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Summary
This summary is machine-generated.

Understanding speciation requires disentangling gene flow, demography, and selection. This study analyzed cricket transcriptomes, revealing demography

Keywords:
Gene flowGryllusmating behavior

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Speciation Research

Background:

  • Gene flow, demography, and selection can mimic genomic variation patterns, complicating speciation studies.
  • Cryptic species Gryllus rubens and Gryllus texensis exhibit divergent mating behaviors, necessitating evolutionary history investigation.

Purpose of the Study:

  • To disentangle the roles of gene flow, demography, and selection in the evolutionary history of Gryllus rubens and Gryllus texensis.
  • To identify genetic footprints of selection within the inferred demographic context of these cricket species.

Main Methods:

  • Transcriptomic variation analysis in Gryllus rubens and Gryllus texensis.
  • Inference of demographic history, including gene flow and population bottlenecks.
  • Screening for footprints of selection, considering demographic history and using FST-based outlier detection.

Main Results:

  • Strong evidence for long-term bidirectional gene flow that ceased in the late Pleistocene.
  • Identification of a population bottleneck in G. rubens, supporting a peripatric origin.
  • Demographic history significantly shaped genetic differentiation (FST distribution); FST-based selection scans yielded many false positives.
  • Alternative selection detection methods highlighted loci potentially controlling mating behavior variation.

Conclusions:

  • Demography plays a crucial role in shaping genetic divergence patterns.
  • Integrating demographic inference with selection analyses provides a more comprehensive understanding of speciation.
  • Identified candidate genes may be key to understanding divergent mating behaviors in closely related species.