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Soc. open sci."],"published-print":{"date-parts":[[2024,1]]},"abstract":"<jats:p>\n                    Understanding the ontogeny of diving behaviour in marine megafauna is crucial owing to its influence on foraging success, energy budgets, and mortality. We compared the ontogeny of diving behaviour in two closely related species\u2014northern elephant seals (\n                    <jats:italic>Mirounga angustirostris, n<\/jats:italic>\n                    = 4) and southern elephant seals (\n                    <jats:italic>Mirounga leonina, n<\/jats:italic>\n                    = 9)\u2014to shed light on the ecological processes underlying migration. Although both species have similar sizes and behaviours as adults, we discovered that juvenile northern elephant seals have superior diving development, reaching 260 m diving depth in just 30 days, while southern elephant seals require 160 days. Similarly, northern elephant seals achieve dive durations of approximately 11 min on their first day of migration, while southern elephant seals take 125 days. The faster physiological maturation of northern elephant seals could be related to longer offspring dependency and post-weaning fast durations, allowing them to develop their endogenous oxygen stores. Comparison across both species suggests that weaned seal pups face a trade-off between leaving early with higher energy stores but poorer physiological abilities or leaving later with improved physiology but reduced fat stores. This trade-off might be influenced by their evolutionary history, which shapes their migration behaviours in changing environments over time.\n                  <\/jats:p>","DOI":"10.1098\/rsos.230666","type":"journal-article","created":{"date-parts":[[2024,1,3]],"date-time":"2024-01-03T03:05:46Z","timestamp":1704251146000},"update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Contrasting offspring dependence periods and diving development rates in two closely related marine mammal species"],"prefix":"10.1098","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2862-0899","authenticated-orcid":true,"given":"Joffrey","family":"Jouma'a","sequence":"first","affiliation":[{"name":"Ecology and Evolutionary Biology, University of California Santa Cruz, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1940-7797","authenticated-orcid":true,"given":"Florian","family":"Orgeret","sequence":"additional","affiliation":[{"name":"Marine Apex Predator Research Unit, Department of Zoology, Institute for Coastal and Marine Research, Nelson Mandela University, Gqeberha 6031, South Africa"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9565-9446","authenticated-orcid":false,"given":"Baptiste","family":"Picard","sequence":"additional","affiliation":[{"name":"Centre d'Etudes Biologiques de Chiz\u00e9, UMR 7372 La Rochelle University-CNRS, La Rochelle, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3957-8347","authenticated-orcid":false,"given":"Patrick W.","family":"Robinson","sequence":"additional","affiliation":[{"name":"Ecology and Evolutionary Biology, University of California Santa Cruz, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0457-586X","authenticated-orcid":true,"given":"Henri","family":"Weimerskirch","sequence":"additional","affiliation":[{"name":"Centre d'Etudes Biologiques de Chiz\u00e9, UMR 7372 La Rochelle University-CNRS, La Rochelle, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2481-6947","authenticated-orcid":false,"given":"Christophe","family":"Guinet","sequence":"additional","affiliation":[{"name":"Centre d'Etudes Biologiques de Chiz\u00e9, UMR 7372 La Rochelle University-CNRS, La Rochelle, France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0233-5782","authenticated-orcid":false,"given":"Daniel P.","family":"Costa","sequence":"additional","affiliation":[{"name":"Ecology and Evolutionary Biology, University of California Santa Cruz, CA, USA"},{"name":"Institute of Marine Sciences, University of California Santa Cruz, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8520-1105","authenticated-orcid":false,"given":"Roxanne S.","family":"Beltran","sequence":"additional","affiliation":[{"name":"Ecology and Evolutionary Biology, University of California Santa Cruz, CA, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2024,1,3]]},"reference":[{"key":"e_1_3_8_2_2","volume-title":"Behavioural ecology: an evolutionary perspective on behaviour","author":"Danchin E, Giraldeau L-A, C\u00e9zilly F. 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