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Reevaluating claims of ecological speciation in Halichoeres bivittatus
  • +3
  • Dan Warren,
  • Ron Eytan,
  • Alex Dornburg,
  • Teresa Iglesias,
  • Matt Brandley,
  • Peter Wainwright
Dan Warren
Okinawa Institute of Science and Technology Graduate University
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Ron Eytan
Texas A&M University at Galveston
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Alex Dornburg
University of North Carolina at Charlotte
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Teresa Iglesias
Okinawa Institute of Science and Technology Graduate University
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Matt Brandley
Carnegie Museum of Natural History
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Peter Wainwright
University of California Davis
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Abstract

Understanding the role of ecological processes in speciation has become one of the most active areas of research in marine population biology in recent decades. The traditional view was that allopatry was the primary driver of speciation in marine taxa, but the geography of the marine environment and the dispersal capabilities of many marine organisms render this view somewhat questionable. One of the earliest and most highly cited empirical examples of ecological speciation with gene flow in marine fishes is that of the slippery dick wrasse, Halichoeres bivittatus. Evidence for this cryptic or incipient speciation event was primarily in the form of a deep north-south divergence in a single mitochondrial locus, combined with a finding that these two haplotypes were associated with different habitat types in the Florida Keys and Bermuda, where they overlap. Here we examine habitat assortment in the Florida Keys using a broader sampling of populations and habitat types than were available for the original study, and find no evidence to support the claim that haplotype frequencies differ between habitat types, and little evidence to support any differences between populations. These results severely undermine claims of ecological speciation with gene flow in Halichoeres bivittatus. We argue that future claims of this type should be supported by multiple lines of evidence that illuminate potential mechanisms and allow researchers to rule out alternative explanations for spatial patterns of genetic differences.

Peer review status:ACCEPTED

19 Mar 2021Submitted to Ecology and Evolution
19 Mar 2021Submission Checks Completed
19 Mar 2021Assigned to Editor
07 Apr 2021Reviewer(s) Assigned
18 Apr 2021Review(s) Completed, Editorial Evaluation Pending
25 May 2021Editorial Decision: Revise Minor
17 Jun 20211st Revision Received
18 Jun 2021Submission Checks Completed
18 Jun 2021Assigned to Editor
18 Jun 2021Review(s) Completed, Editorial Evaluation Pending
07 Jul 2021Editorial Decision: Accept