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dc.contributor.authorHooker, Sascha Kate
dc.contributor.authorAndrews, Russel
dc.contributor.authorArnould, John
dc.contributor.authorBester, Marthan
dc.contributor.authorDavis, Randall
dc.contributor.authorInsley, Stephen
dc.contributor.authorGales, Nick
dc.contributor.authorGoldsworthy, Simon
dc.contributor.authorMcKnight, Chris
dc.identifier.citationHooker , S K , Andrews , R , Arnould , J , Bester , M , Davis , R , Insley , S , Gales , N , Goldsworthy , S & McKnight , C 2021 , ' Fur seals do, but sea lions don’t – cross taxa insights into exhalation during ascent from dives ' , Philosophical Transactions of the Royal Society. B, Biological Sciences , vol. 376 , no. 1830 , 20200219 .
dc.identifier.otherPURE: 274637324
dc.identifier.otherPURE UUID: 692c6c7a-2295-4320-bf46-52e1f11b783c
dc.identifier.otherORCID: /0000-0002-7518-3548/work/95772308
dc.identifier.otherORCID: /0000-0002-3872-4886/work/95772579
dc.identifier.otherScopus: 85108185747
dc.identifier.otherWOS: 000663556900003
dc.descriptionMany agencies provided funding and logistical support for the various research efforts resulting in the data presented here: the South African Department of Science and Technology, administered by the National Research Foundation and the Department of Environmental Affairs for subantarctic fur seal work; the Australian Research Council (DP110102065), Holsworth Wildlife Research Endowment and the Office of Naval Research (Marine Mammals and Biological Oceanography Program Award no. N00014-10-1-0385) for Australian fur seal work; the National Oceanic and Atmospheric Administration (NOAA) via grants to the Alaska SeaLife Center and the National Marine Mammal Laboratory, with additional funding and logistical support from North Pacific Wildlife Consulting for Steller sea lion and northern fur seal (Russia) work; the National Marine Mammal Laboratory, National Marine Fisheries Service, NOAA for northern fur seal (Alaska) work. Research support for R.W. Davis was provided by the National Science Foundation.en
dc.description.abstractManagement of gases during diving is not well understood across marine mammal species. Prior to diving, phocid (true) seals generally exhale, a behaviour thought to assist with the prevention of decompression sickness. Otariid seals (fur seals and sea lions) have a greater reliance on their lung oxygen stores, and inhale prior to diving. One otariid, the Antarctic fur seal (Arctocephalus gazella), then exhales during the final 50–85% of the return to the surface, which may prevent another gas management issue: shallow-water blackout. Here, we compare data collected from animal-attached tags (video cameras, hydrophones and conductivity sensors) deployed on a suite of otariid seal species to examine the ubiquity of ascent exhalations for this group. We find evidence for ascent exhalations across four fur seal species, but that such exhalations are absent for three sea lion species. Fur seals and sea lions are no longer genetically separated into distinct subfamilies, but are morphologically distinguished by the thick underfur layer of fur seals. Together with their smaller size and energetic dives, we suggest their air-filled fur might underlie the need to perform these exhalations, although whether to reduce buoyancy and ascent speed, for the avoidance of shallow-water blackout or to prevent other cardiovascular management issues in their diving remains unclear.
dc.relation.ispartofPhilosophical Transactions of the Royal Society. B, Biological Sciencesen
dc.rightsCopyright © 2021 the Author(s). Published by the Royal Society. All rights reserved. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectFur sealen
dc.subjectSea lionen
dc.subjectGas managementen
dc.subjectShallow-water blackouten
dc.subjectQH301 Biologyen
dc.subjectQL Zoologyen
dc.titleFur seals do, but sea lions don’t – cross taxa insights into exhalation during ascent from divesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.Institute of Behavioural and Neural Sciencesen
dc.contributor.institutionUniversity of St Andrews.Sea Mammal Research Uniten
dc.contributor.institutionUniversity of St Andrews.School of Biologyen
dc.description.statusPeer revieweden

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