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  1. Home
  3. A 'bermuda Triangle' Effect Shaping Reef Fish Connectivity Across The Western Atlantic.
  1. Home
  3. A 'bermuda Triangle' Effect Shaping Reef Fish Connectivity Across The Western Atlantic.

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A 'Bermuda Triangle' Effect Shaping Reef Fish Connectivity Across the Western Atlantic.

Melissa Scheel-Dalmau1,2, Jose Julian Tavera3, Kenyon C Lindeman4

  • 1Instituto de Estudios en Ciencias del Mar-Cecimar, Universidad Nacional de Colombia Sede Caribe, Santa Marta, Colombia.

Molecular Ecology
|June 24, 2026

View abstract on PubMed

Summary
This summary is machine-generated.

Marine connectivity shapes gene flow in tomtate fish across the Atlantic. Genetic analyses reveal distinct populations and asymmetric gene flow, creating a unique

Keywords:
HaemulidaeRADseqphylogeographic breaksphylogeographysource sink dynamicsspecies boundaries

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Area of Science:

  • Marine Biology
  • Population Genetics
  • Oceanography

Background:

  • Marine connectivity is crucial for understanding gene flow and population structure in reef organisms.
  • Ocean currents significantly influence larval transport and genetic exchange.

Purpose of the Study:

  • To examine range-wide patterns of gene flow and population structure in the tomtate (Haemulon aurolineatum).
  • To assess connectivity, demographic history, and lineage boundaries across the species' distribution in the western Atlantic.

Main Methods:

  • Utilized genome-wide single nucleotide polymorphisms (SNPs) and mitochondrial DNA sequences.
  • Incorporated a re-evaluation of morphological variation across 22 locations.
  • Employed population structure, phylogenetic analyses, demographic modeling, and coalescent-based species delimitation.

Main Results:

  • Identified three main genetic groups: Caribbean/Southwestern Atlantic (CSA), Gulf of Mexico (GOM), and Bermuda (BDA).
  • Revealed early divergence with sustained, asymmetric gene flow, particularly into Bermuda, acting as a demographic sink.
  • Marine barriers (e.g., Caribbean breaks) contributed to differentiation, while coastal corridors facilitated gene flow.

Conclusions:

  • Asymmetric dispersal and oceanographic isolation structure genetic diversity in marine organisms.
  • Peripheral demographic sinks, like Bermuda, promote long-term genetic differentiation (the 'Bermuda Triangle effect').
  • Identified three distinct lineages, interpreted as subspecies, not fully reproductively isolated.