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An extreme mammalian example is the Arctic ringed seal (<jats:italic>Pusa hispida hispida<\/jats:italic>), which is assumed to be panmictic across its circumpolar Arctic range. Yet, local Inuit communities in Greenland and Canada recognize several regional variants; a finding supported by scientific studies of body size variation. It is however unclear whether this phenotypic variation reflects plasticity, morphs or distinct ecotypes. Here, we combine genomic, biologging and survey data, to document the existence of a unique ringed seal ecotype in the Ilulissat Icefjord (locally \u2018Kangia\u2019), Greenland; a UNESCO World Heritage site, which is home to the most productive marine\u2010terminating glacier in the Arctic. Genomic analyses reveal a divergence of Kangia ringed seals from other Arctic ringed seals about 240\u2009kya, followed by secondary contact since the Last Glacial Maximum. Despite ongoing gene flow, multiple genomic regions appear under strong selection in Kangia ringed seals, including candidate genes associated with pelage coloration, growth and osmoregulation, potentially explaining the Kangia seal's phenotypic and behavioural uniqueness. The description of \u2018hidden\u2019 diversity and adaptations in yet another Arctic species merits a reassessment of the evolutionary processes that have shaped Arctic diversity and the traditional view of this region as an evolutionary freezer. Our study highlights the value of indigenous knowledge in guiding science and calls for efforts to identify distinct populations or ecotypes to understand how these might respond differently to environmental change.<\/jats:p>","DOI":"10.1111\/mec.17163","type":"journal-article","created":{"date-parts":[[2023,10,19]],"date-time":"2023-10-19T09:02:51Z","timestamp":1697706171000},"page":"5932-5943","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["An evolutionarily distinct ringed seal in the Ilulissat Icefjord"],"prefix":"10.1111","volume":"32","author":[{"given":"Aqqalu","family":"Rosing\u2010Asvid","sequence":"first","affiliation":[{"name":"Greenland Institute of Natural Resources  Nuuk 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