{
  "abstract": "Antarctic toothfish (Dissostichus mawsoni) are a critical top fish predator in the Southern Ocean whose population dynamics are strongly influenced by a changing climate and fishing pressure. Their complex, long-lived life history presents challenges to understanding their population dynamics that we endeavor to overcome through the use of both reduced-representation sequencing and whole-genome resequencing data from fish across different cohorts. Our unique sample set allowed us to compare genomic structure, diversity, and demographic changes between cohorts born before and after the year 2000, when changes to fisheries management practices in the Southern Ocean reduced incidences of illegal, unreported, and unregulated fishing. While our population structure analyses corroborate recent studies showing panmixia across circumpolar populations of D. mawsoni, comparisons between cohorts revealed key exceptions. A lack of admixture in fish born before 2000 contrasted with widespread admixture among post-2000 individuals, consistent with increased mixing and/or genotype influx. Notably, genome-wide diversity declined over time in the Ross Sea (management area 88), with significant losses observed in heterozygosity between pre-2000 and post-2000 cohorts. Elevated levels of inbreeding in the Ross Sea, coupled with evidence for recent population contraction from positive Tajima's D values, provided potential explanations for the observed reductions in genomic diversity. Our results reconcile circumpolar panmixia with localized erosion of diversity and elevated inbreeding in the Ross Sea sector, underscoring the value of temporal monitoring and the need to prioritize future research on the interplay between fisheries pressure and environmental change in driving population dynamics and genomic structure in exploited Southern Ocean species like toothfish.",
  "abstract_shown": true,
  "affiliations": [
    "Berlin Center for Genomics in Biodiversity Research, BeGenDiv Berlin Germany",
    "Department of Evolutionary Genetics Leibniz‐Institut für Zoo‐ und Wildtierforschung, IZW Berlin Germany",
    "Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA‐CNRS‐UVSQ, Université Paris‐Saclay Gif‐sur‐Yvette France",
    "Laboratoire d'Océanographie et du Climat Expérimentations et Approches Numériques, LOCEAN/IPSL, UPMC‐CNRS‐IRD‐MNHN, Sorbonne Université Paris France",
    "Institute of Biochemistry and Biology, Evolutionary Biology & Systematic Zoology University of Potsdam Potsdam Germany",
    "Department of Integrative Biology University of South Florida Tampa Florida USA",
    "Leibniz‐Institut für Gewässerökologie und Binnenfischerei (IGB) Berlin Germany"
  ],
  "article_type": "research article",
  "arxiv": null,
  "author_total": 6,
  "authors": [
    {
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        0,
        1,
        2,
        3
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      "name": "Jilda Alicia Caccavo",
      "orcid": "0000-0002-8172-7855"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Larissa S. Arantes",
      "orcid": "0000-0003-1374-6701"
    },
    {
      "affs": [
        4,
        5
      ],
      "name": "Enrique Celemín",
      "orcid": "0000-0002-2232-3930"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Susan Mbedi",
      "orcid": "0000-0002-9633-5045"
    },
    {
      "affs": [
        0,
        6
      ],
      "name": "Sarah Sparmann",
      "orcid": "0000-0001-9278-4081"
    },
    {
      "affs": [
        0,
        1
      ],
      "name": "Camila J. Mazzoni",
      "orcid": "0000-0001-6758-5427"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/97g8emmv83n4j.bib",
  "cited_by": 0,
  "doi": "10.1002/ece3.74262",
  "fulltext_url": "https://europepmc.org/articles/PMC13680862",
  "id": "97g8emmv83n4j",
  "issns": [
    "2045-7758"
  ],
  "landing_url": "https://hal.science/hal-05838851v1",
  "language": "en",
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": null,
  "native_subjects": [
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      "hal",
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      "hal",
      "1.sdu.ocean"
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    [
      "openalex",
      "1311|Genetic diversity and population structure"
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  "openalex": "W7223010506",
  "pdf_url": "https://hal.science/hal-05838851/document",
  "pmcid": "PMC13680862",
  "pmid": "42903274",
  "published": "2026-10-19",
  "publisher": "Wiley Open Access",
  "ris": "https://research.draconitic.com/paper/97g8emmv83n4j.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:01Z",
      "native_id": "hal-05838851",
      "source": "hal",
      "url": "https://hal.science/hal-05838851v1"
    },
    {
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      "native_id": "10.1002/ece3.74262",
      "source": "crossref",
      "url": "https://onlinelibrary.wiley.com/doi/10.1002/ece3.74262"
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    {
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      "native_id": "MED:42903274",
      "source": "europepmc",
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  "subjects": [
    {
      "field": "earth",
      "origin": "hal:1.sdu.envi",
      "subfield": "environmental-science"
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    {
      "field": "earth",
      "origin": "hal:1.sdu.ocean",
      "subfield": "oceanography"
    }
  ],
  "title": "Whole‐Genome Resequencing Reveals Exceptions to Panmixia in the Exploited Top Fish Predator Antarctic Toothfish ( Dissostichus mawsoni )",
  "title_text": "Whole‐Genome Resequencing Reveals Exceptions to Panmixia in the Exploited Top Fish Predator Antarctic Toothfish ( Dissostichus mawsoni )",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:19:53Z",
  "url": "https://research.draconitic.com/paper/97g8emmv83n4j",
  "venue": "Ecology and Evolution",
  "versions": []
}