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Their replenishment of body stores influences their energy expenditure during dives and their oxygen (O2) reserves (via muscular mass), yet how they manage their O2 stores during their dives is not fully understood. In this study, 63 female SESs from Kerguelen Island were equipped with accelerometers and time\u2013depth recorders to investigate changes in diving parameters through their foraging trips. Two categories of dive behaviour were identified and related to the body size of individuals, with smaller SESs performing shallower and shorter dives requiring greater mean stroke amplitude compared with larger individuals. In relation to body size, the larger seals had lower estimated oxygen consumption levels for a given buoyancy (i.e. body density) compared with smaller individuals. However, both groups were estimated to have the same oxygen consumption of 0.079\u00b10.001\u2005ml O2 stroke\u22121 kg\u22121 for a given dive duration and at neutral buoyancy when the cost of transport was minimal. Based on these relationships, we built two models that estimate changes in oxygen consumption according to dive duration and body density. The study highlights that replenishing body stores improves SES foraging efficiency, as indicated by increased time spent at the bottom of the ocean. Thus, prey\u2013capture attempts increase as SES buoyancy approaches the neutral buoyancy point.<\/jats:p>","DOI":"10.1242\/jeb.245157","type":"journal-article","created":{"date-parts":[[2023,6,16]],"date-time":"2023-06-16T07:05:28Z","timestamp":1686899128000},"source":"Crossref","is-referenced-by-count":13,"title":["Diving behaviour of southern elephant seals: new models of behavioural and ecophysiological adjustments of oxygen store management"],"prefix":"10.1242","volume":"226","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7175-7831","authenticated-orcid":false,"given":"Erwan","family":"Piot","sequence":"first","affiliation":[{"name":"Centre d\u2019\u00c9tudes Biologiques de Chiz\u00e9-Centre National de la Recherche Scientifique (CEBC-CNRS), Equipe Pr\u00e9dateurs marins, UMR 7372 CNRS\/Universit\u00e9 de La Rochelle 1 , 79360 Villiers-en-Bois , France"},{"name":"Laboratoire MECADEV, UMR 7179 CNRS\/MNHN 2 , 1 Avenue du Petit Ch\u00e2teau, 91800 Brunoy , France"},{"name":"CNRS UMR 5536, Equipe BMI, Universit\u00e9 de Bordeaux 4 , 33076 Bordeaux , France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Baptiste","family":"Picard","sequence":"additional","affiliation":[{"name":"Centre d\u2019\u00c9tudes Biologiques de Chiz\u00e9-Centre National de la Recherche Scientifique (CEBC-CNRS), Equipe Pr\u00e9dateurs marins, UMR 7372 CNRS\/Universit\u00e9 de La Rochelle 1 , 79360 Villiers-en-Bois , France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8475-0519","authenticated-orcid":false,"given":"J\u00e9r\u00f4me","family":"Badaut","sequence":"additional","affiliation":[{"name":"CNRS UMR 5536, Equipe BMI, Universit\u00e9 de Bordeaux 4 , 33076 Bordeaux , France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9957-405X","authenticated-orcid":false,"given":"Caroline","family":"Gilbert","sequence":"additional","affiliation":[{"name":"Laboratoire MECADEV, UMR 7179 CNRS\/MNHN 2 , 1 Avenue du Petit Ch\u00e2teau, 91800 Brunoy , France"},{"name":"\u00c9cole Nationale V\u00e9t\u00e9rinaire d'Alfort, 7 Avenue du G\u00e9n\u00e9ral de Gaulle 3 , 94704 Maisons-Alfort cedex , France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Guinet","sequence":"additional","affiliation":[{"name":"Centre d\u2019\u00c9tudes Biologiques de Chiz\u00e9-Centre National de la Recherche Scientifique (CEBC-CNRS), Equipe Pr\u00e9dateurs marins, UMR 7372 CNRS\/Universit\u00e9 de La Rochelle 1 , 79360 Villiers-en-Bois , France"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[2023,7,6]]},"reference":[{"key":"2023080209035544800_JEB245157C1","doi-asserted-by":"publisher","first-page":"20142120","DOI":"10.1098\/rspb.2014.2120","article-title":"The foraging benefits of being fat in a highly migratory marine mammal","volume":"281","author":"Adachi","year":"2014","journal-title":"Proc. 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