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Related Concept Videos

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Updated: Aug 17, 2025

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid
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Speciation without gene-flow in hybridizing deer.

Camille Kessler1, Eric Wootton2, Aaron B A Shafer1

  • 1Environmental and Life Sciences Graduate Program, Trent University, Peterborough, Ontario, Canada.

Molecular Ecology
|December 14, 2022
PubMed
Summary
This summary is machine-generated.

White-tailed and mule deer speciation shows little historical gene flow, suggesting geographic separation during the Pleistocene. Localized selection, not widespread gene flow, drives their distinct evolutionary paths.

Keywords:
Odocoileusallopatric speciationhybridisationsecondary contactspeciation genomics

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Area of Science:

  • Evolutionary Biology
  • Genomics
  • Speciation Research

Background:

  • Ecological speciation proposes divergent selection drives reproductive isolation.
  • Hybridization can influence speciation, potentially promoting or inhibiting it.
  • Understanding speciation in sister species like deer provides insights into evolutionary processes.

Purpose of the Study:

  • Investigate speciation patterns in hybridizing white-tailed (Odocoileus virginianus) and mule deer (O. hemionus).
  • Quantify historical introgression and identify selection signatures across the genome.
  • Determine the role of gene flow versus other evolutionary forces in deer speciation.

Main Methods:

  • Genome-wide historical introgression analysis.
  • Genome scans for signatures of divergent, allopatric, and balancing selection.
  • Analysis of genes under balancing selection for functional insights.

Main Results:

  • Negligible ancestral introgression detected between white-tailed and mule deer.
  • No signatures of divergence with gene flow found; localized allopatric and balancing selection identified.
  • Genes under balancing selection are linked to immunity, MHC, and olfactory perception.

Conclusions:

  • Pleistocene glaciation likely caused spatial separation, leading to differentiation via genetic drift.
  • Speciation is driven by localized selection and potentially Dobzhansky-Muller incompatibilities, not historical gene flow.
  • Deer sister species are advanced in the speciation continuum, indicated by diversity-recombination correlations.