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Given their importance in regional food webs, coupled with the uncertain impacts of climate change, the on-going recovery of krill-eating marine mammals, and the expanding commercial fishery for Antarctic krill, there is an increasing need to improve current estimates of their circumpolar habitat distribution. Here, we provide an estimate of the austral summer circumpolar habitat distribution of both species using an ensemble of habitat models and updated environmental covariates. Our models were able to resolve the segregated habitats of both species. We find that extensive potential habitat for Antarctic krill is mainly situated in the open ocean and concentrated in the Atlantic sector of the Southern Ocean, while Ice krill habitat was concentrated more evenly around the continent, largely over the continental shelf. Ice krill habitat was mainly predicted by surface oxygen concentration and water column temperature, while Antarctic krill was additionally characterized by mixed layer depth, distance to the continental shelf edge, and surface salinity. Our results further improve understanding about these key species, helping inform sustainable circumpolar management practices.<\/jats:p>","DOI":"10.1093\/icesjms\/fsad110","type":"journal-article","created":{"date-parts":[[2023,7,14]],"date-time":"2023-07-14T09:27:22Z","timestamp":1689326842000},"page":"1773-1786","source":"Crossref","is-referenced-by-count":13,"title":["Quantifying circumpolar summer habitat for Antarctic krill and Ice krill, two key species of the Antarctic marine ecosystem"],"prefix":"10.1093","volume":"80","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8637-7655","authenticated-orcid":false,"given":"B","family":"Merkel","sequence":"first","affiliation":[{"name":"Akvaplan-niva As, Fram Centre , P.O. Box 6606 Langnes, 9296 Troms\u00f8 , Norway"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6673-9930","authenticated-orcid":false,"given":"P","family":"Trathan","sequence":"additional","affiliation":[{"name":"British Antarctic Survey, Natural Environment Research Council , High Cross, Madingley Rd, Cambridge CB3 0ET , UK"},{"name":"Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton , European Way, Southampton, SO17 1BJ , UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5193-6955","authenticated-orcid":false,"given":"S","family":"Thorpe","sequence":"additional","affiliation":[{"name":"British Antarctic Survey, Natural Environment Research Council , High Cross, Madingley Rd, Cambridge CB3 0ET , UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7369-9196","authenticated-orcid":false,"given":"E J","family":"Murphy","sequence":"additional","affiliation":[{"name":"British Antarctic Survey, Natural Environment Research Council , High Cross, Madingley Rd, Cambridge CB3 0ET , UK"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1916-7831","authenticated-orcid":false,"given":"H","family":"Pehlke","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research , 27570 Bremerhaven , Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9595-7443","authenticated-orcid":false,"given":"K","family":"Teschke","sequence":"additional","affiliation":[{"name":"Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research , 27570 Bremerhaven , Germany"},{"name":"Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg , Ammerl\u00e4nder Heerstra\u00dfe 231, 23129, Oldenburg , Germany"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7136-4237","authenticated-orcid":false,"given":"G P","family":"Griffith","sequence":"additional","affiliation":[{"name":"Norwegian Polar Institute, Fram Centre , P.O. 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