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Here we compared high\u2010resolution multi\u2010sensor tag data from northern bottlenose whales in Jan Mayen, Norway (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200915, 127.2\u2009h) and the Gully, Scotian Shelf, Canada (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u20096, 45.8\u2009h) to compare diving and foraging behaviours.\n                    <jats:italic>K<\/jats:italic>\n                    \u2010means clustering identified short\u2010shallow and long\u2010deep dive types in both locations but showed a propensity for mid\u2010depth dives in Jan Mayen. Foraging dives (defined by high roll variance corroborated by active clicking) included long\u2010deep dives (Jan Mayen\u2009=\u2009967\u2009\u00b1\u2009394\u2009m SD,\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200926; Gully\u2009=\u20091247\u2009\u00b1\u2009411\u2009m,\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200914) but also these mid\u2010depth dives (537\u2009\u00b1\u2009135\u2009m,\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u2009105). Time budgets varied substantially between locations with whales in the Gully spending 15% less time foraging (\n                    <jats:italic>Z<\/jats:italic>\n                    \u2009=\u20092.1,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.03) and twice as much time near\u2010surface resting (\n                    <jats:italic>Z<\/jats:italic>\n                    \u2009=\u2009\u22123.8,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001). Movement parameters further showed enigmatic gyrations during dives, more common in Jan Mayen. Skin biopsy stable isotopes revealed small regional differences, likely reflecting both diet and ecoregion (Jan Mayen\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200918:\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>15<\/jats:sup>\n                    N 15.03\u2030\u2009\u00b1\u20090.35\u2030, Gully\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200941:\n                    <jats:italic>\u03b4<\/jats:italic>\n                    <jats:sup>15<\/jats:sup>\n                    N 15.41\u2030\u2009\u00b1\u20090.44\u2030). These population differences suggest unequal susceptibility to stressors and unequal likelihood of detection, with consequences for population management and abundance estimation.\n                  <\/jats:p>","DOI":"10.1002\/ece3.73690","type":"journal-article","created":{"date-parts":[[2026,5,28]],"date-time":"2026-05-28T01:09:53Z","timestamp":1779930593000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Geographic Variation in Diving Behaviour and Skin Isotope Ratios of Northern Bottlenose Whales,\n                    <i>Hyperoodon ampullatus<\/i>"],"prefix":"10.1002","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7518-3548","authenticated-orcid":false,"given":"Sascha K.","family":"Hooker","sequence":"first","affiliation":[{"name":"Sea Mammal Research Unit, Scottish Oceans Institute University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7833-302X","authenticated-orcid":false,"given":"Eilidh","family":"Siegal","sequence":"additional","affiliation":[{"name":"Sea Mammal Research Unit, Scottish Oceans Institute University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6801-0860","authenticated-orcid":false,"given":"Tessa","family":"Plint","sequence":"additional","affiliation":[{"name":"Scottish Marine Animal Stranding Scheme, School of Biodiversity, One Health, and Veterinary Medicine University of Glasgow  Glasgow UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9300-1947","authenticated-orcid":false,"given":"Laura J.","family":"Feyrer","sequence":"additional","affiliation":[{"name":"Dalhousie University  Halifax Nova Scotia Canada"},{"name":"Fisheries and Oceans Canada Maritimes Region  Dartmouth Nova Scotia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4513-3432","authenticated-orcid":false,"given":"Tomoko","family":"Narazaki","sequence":"additional","affiliation":[{"name":"Sea Mammal Research Unit, Scottish Oceans Institute University of St Andrews  St Andrews UK"},{"name":"Department of Environmental Bioscience Meijo University  Nagoya Aichi Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5986-9849","authenticated-orcid":false,"given":"Kagari","family":"Aoki","sequence":"additional","affiliation":[{"name":"Sea Mammal Research Unit, Scottish Oceans Institute University of St Andrews  St Andrews UK"},{"name":"Atmosphere and Ocean Research Institute The University of Tokyo  Chiba Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3414-1157","authenticated-orcid":false,"given":"Matt","family":"Bivins","sequence":"additional","affiliation":[{"name":"Sea Mammal Research Unit, Scottish Oceans Institute University of St Andrews  St Andrews UK"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8028-9673","authenticated-orcid":false,"given":"Patrick J. 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