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Speciation along a shared evolutionary trajectory.

Ned A Dochtermann1, Marjorie D Matocq2

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Area of Science:

  • Evolutionary biology
  • Speciation research
  • Comparative genomics

Background:

  • Organism groups can diverge phenotypically, genetically, or in their evolutionary responses.
  • Understanding response divergence is crucial for comprehending speciation and species boundary maintenance.

Purpose of the Study:

  • To investigate response divergence between two woodrat species, Neotoma fuscipes and Neotoma macrotis.
  • To determine if these species are evolving along a shared evolutionary trajectory despite phenotypic and genetic differentiation.

Main Methods:

  • Utilized random skewers analyses to assess evolutionary trajectories.
  • Compared phenotypic and genetic differentiation between N. fuscipes and N. macrotis.

Main Results:

  • N. fuscipes and N. macrotis, despite significant differentiation, show evidence of diverging along a shared evolutionary trajectory (r° = 0.895, P = 0.114).
  • The species are in secondary contact, suggesting ongoing interactions.

Conclusions:

  • The shared evolutionary trajectory may constrain the response to selection arising from interspecific interactions.
  • This constraint could reduce the potential for reinforcing selection to maintain distinct species boundaries between N. fuscipes and N. macrotis.