The fourspine stickleback (Apeltes quadracus) has an XY sex chromosome system with polymorphic inversions on both X and Y chromosomes

• Zuyao Liu,

  Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Resources, Software, Visualization, Writing – original draft

  Affiliation Division of Evolutionary Ecology, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland

  https://orcid.org/0000-0001-8972-1426

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• Amy L. Herbert,

  Roles Data curation, Formal analysis, Investigation, Resources, Software, Visualization, Writing – review & editing

  Affiliations Department of Developmental Biology, Stanford University School of Medicine, Stanford, California, United States of America, Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California, United States of America

  https://orcid.org/0000-0001-9415-3857

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• Yingguang Frank Chan,

  Roles Funding acquisition, Methodology, Resources, Supervision, Writing – review & editing

  Affiliations Friedrich Miescher Laboratory of the Max Planck Society, Tübingen, Germany, Groningen Institute for Evolutionary Life Sciences (GELIFES), University of Groningen, Groningen, The Netherlands

  https://orcid.org/0000-0001-6292-9681

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• Marek Kučka,

  Roles Investigation, Methodology

  Affiliation Friedrich Miescher Laboratory of the Max Planck Society, Tübingen, Germany

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• David M. Kingsley,

  Roles Funding acquisition, Resources, Supervision, Writing – review & editing

  Affiliations Department of Developmental Biology, Stanford University School of Medicine, Stanford, California, United States of America, Howard Hughes Medical Institute, Stanford University School of Medicine, Stanford, California, United States of America

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• Catherine L. Peichel

  Roles Conceptualization, Funding acquisition, Project administration, Resources, Supervision, Writing – original draft

  * catherine.peichel@unibe.ch

  Affiliation Division of Evolutionary Ecology, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland

  https://orcid.org/0000-0002-7731-8944

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