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dc.contributor.authorHooker, Sascha K.
dc.contributor.authorMiller, Patrick J. O.
dc.contributor.authorJohnson, Mark P.
dc.contributor.authorCox, Oliver P.
dc.contributor.authorBoyd, Ian L.
dc.date.accessioned2005-12-09T19:05:49Z
dc.date.available2005-12-09T19:05:49Z
dc.date.issued2005-02-22
dc.identifier.citationProceedings of the Royal Society of London B 272 (2005): 355-363en
dc.identifier.urihttp://hdl.handle.net/1912/242
dc.descriptionAuthor Posting. © Royal Society, 2005. This article is posted here by permission of Royal Society for personal use, not for redistribution. The definitive version was published in Proceedings of the Royal Society of London B 272 (2005): 355-363, doi:10.1098/rspb.2004.2964.
dc.description.abstractNovel observations collected from video, acoustic and conductivity sensors showed that Antarctic fur seals consistently exhale during the last 50–85% of ascent from all dives (10–160 m, n > 8000 dives from 50 seals). The depth of initial bubble emission was best predicted by maximum dive depth, suggesting an underlying physical mechanism. Bubble sound intensity recorded from one seal followed predictions of a simple model based on venting expanding lung air with decreasing pressure. Comparison of air release between dives, together with lack of variation in intensity of thrusting movement during initial descent regardless of ultimate dive depth, suggested that inhaled diving lung volume was constant for all dives. The thrusting intensity in the final phase of ascent was greater for dives in which ascent exhalation began at a greater depth, suggesting an energetic cost to this behaviour, probably as a result of loss of buoyancy from reduced lung volume. These results suggest that fur seals descend with full lung air stores, and thus face the physiological consequences of pressure at depth. We suggest that these regular and predictable ascent exhalations could function to reduce the potential for a precipitous drop in blood oxygen that would result in shallow-water blackout.en
dc.description.sponsorshipS.K.H. received support from a Royal Society Dorothy Hodgkin fellowship; P.J.O.M. received support from a Royal Society USA fellowship.en
dc.format.extent756053 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoenen
dc.publisherRoyal Societyen
dc.relation.urihttps://doi.org/10.1098/rspb.2004.2964
dc.subjectMarine mammalen
dc.subjectOtariiden
dc.subjectDivingen
dc.subjectPhysiologyen
dc.subjectAntarctic fur sealen
dc.subjectShallow-water blackouten
dc.titleAscent exhalations of Antarctic fur seals : a behavioural adaptation for breath-hold diving?en
dc.typeArticleen
dc.identifier.doi10.1098/rspb.2004.2964


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