Ascent exhalations of Antarctic fur seals : a behavioural adaptation for breath-hold diving?


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dc.contributor.author Hooker, Sascha K.
dc.contributor.author Miller, Patrick J. O.
dc.contributor.author Johnson, Mark P.
dc.contributor.author Cox, Oliver P.
dc.contributor.author Boyd, Ian L.
dc.date.accessioned 2005-12-09T19:05:49Z
dc.date.available 2005-12-09T19:05:49Z
dc.date.issued 2005-02-22
dc.identifier.citation Proceedings of the Royal Society of London B 272 (2005): 355-363 en
dc.identifier.uri http://hdl.handle.net/1912/242
dc.description Author 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.abstract Novel 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.sponsorship S.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.extent 756053 bytes
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Royal Society en
dc.relation.uri http://dx.doi.org/10.1098/rspb.2004.2964
dc.subject Marine mammal en
dc.subject Otariid en
dc.subject Diving en
dc.subject Physiology en
dc.subject Antarctic fur seal en
dc.subject Shallow-water blackout en
dc.title Ascent exhalations of Antarctic fur seals : a behavioural adaptation for breath-hold diving? en
dc.type Article en
dc.identifier.doi 10.1098/rspb.2004.2964

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