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<p>Effective conservation planning relies on understanding population connectivity which can be characterized with genomic data. This is particularly important for sessile species like the horse mussel (<i>Modiolus modiolus</i>), a key habitat-forming species and conservation priority in Atlantic Canada, which rely on larval dispersal for connectivity and may exhibit different patterns than motile taxa. Little genomic information is available to describe horse mussel connectivity patterns, so we used more than 8000 restriction-site associated DNA sequencing-derived single nucleotide polymorphisms and a panel of seven microsatellites to examine genomic connectivity among horse mussels along the east coast of Canada. Despite phenotypic differences between sampling locations, we found a lack of genetic diversity and population structure in horse mussels in the northwest Atlantic Ocean and only weak association between collection site and the environment. Principal component analysis, Admixture analysis, pairwise <i>F</i><sub>ST</sub> calculations, and analysis of loci potentially under selection showed no independent genomic clusters within the data. Analysis of molecular variance showed that less than 1% of the variation within the SNP dataset was found between sampling locations. Our results show no evidence of genome-wide genetic population structure in horse mussels from the Bay of Fundy to Newfoundland, a distance of over 1500&#xa0;km, revealing that connectivity is high among horse mussel populations in the northwest Atlantic. Coupled with large effective population sizes, this has resulted in minimal genomic divergence across the region. These results can inform conservation design in the Bay of Fundy and support further integration into the broader regional conservation network.</p>

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Widespread genetic similarity between Northwest Atlantic populations of the horse mussel, Modiolus modiolus

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月15日

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  • M Van Wyngaarden,
  • N W Jeffery,
  • J A Sameoto,
  • E Cronmiller,
  • M C McBride,
  • B R Wilson,
  • J Raper,
  • O Trela,
  • R R E Stanley,
  • T Kess,
  • K K S Layton,
  • I R Bradbury,
  • B F Wringe

摘要

Effective conservation planning relies on understanding population connectivity which can be characterized with genomic data. This is particularly important for sessile species like the horse mussel (Modiolus modiolus), a key habitat-forming species and conservation priority in Atlantic Canada, which rely on larval dispersal for connectivity and may exhibit different patterns than motile taxa. Little genomic information is available to describe horse mussel connectivity patterns, so we used more than 8000 restriction-site associated DNA sequencing-derived single nucleotide polymorphisms and a panel of seven microsatellites to examine genomic connectivity among horse mussels along the east coast of Canada. Despite phenotypic differences between sampling locations, we found a lack of genetic diversity and population structure in horse mussels in the northwest Atlantic Ocean and only weak association between collection site and the environment. Principal component analysis, Admixture analysis, pairwise FST calculations, and analysis of loci potentially under selection showed no independent genomic clusters within the data. Analysis of molecular variance showed that less than 1% of the variation within the SNP dataset was found between sampling locations. Our results show no evidence of genome-wide genetic population structure in horse mussels from the Bay of Fundy to Newfoundland, a distance of over 1500 km, revealing that connectivity is high among horse mussel populations in the northwest Atlantic. Coupled with large effective population sizes, this has resulted in minimal genomic divergence across the region. These results can inform conservation design in the Bay of Fundy and support further integration into the broader regional conservation network.