Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving?
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 (10-160m, n > 8000 dives from 50 seals). The depth of initial bubble emission was best predicted by maximum dive depth, su...
Published in: | Proceedings of the Royal Society B: Biological Sciences |
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Language: | English |
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2005
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/ascent-exhalations-of-antarctic-fur-seals-a-behavioural-adaptation-for-breathhold-diving(398b46f4-1fa9-4563-81a9-860c52516710).html https://doi.org/10.1098/rspb.2004.2964 http://www.scopus.com/inward/record.url?scp=20144388224&partnerID=8YFLogxK |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/398b46f4-1fa9-4563-81a9-860c52516710 2023-05-15T13:47:48+02:00 Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? Hooker, Sascha Kate Miller, Patrick Johnson, MP Cox, OP Boyd, Ian Lamont 2005-02-22 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/ascent-exhalations-of-antarctic-fur-seals-a-behavioural-adaptation-for-breathhold-diving(398b46f4-1fa9-4563-81a9-860c52516710).html https://doi.org/10.1098/rspb.2004.2964 http://www.scopus.com/inward/record.url?scp=20144388224&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Hooker , S K , Miller , P , Johnson , MP , Cox , OP & Boyd , I L 2005 , ' Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? ' , Proceedings of the Royal Society of London Series B: Biological Sciences , vol. 272 , no. 1561 , pp. 355-363 . https://doi.org/10.1098/rspb.2004.2964 marine mammal otariid diving physiology Antarctic fur seal shallow-water blackout NORTHERN ELEPHANT SEALS ACOUSTIC RECORDING TAG MARINE MAMMALS CEREBRAL TOLERANCE NITROGEN TENSIONS SIMULATED DIVES WEDDELL SEALS GAS-EXCHANGE DEPTH BUOYANCY article 2005 ftunstandrewcris https://doi.org/10.1098/rspb.2004.2964 2021-12-26T14:13:06Z 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 (10-160m, 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. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Elephant Seals Weddell Seals University of St Andrews: Research Portal Antarctic Weddell Proceedings of the Royal Society B: Biological Sciences 272 1561 355 363 |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
marine mammal otariid diving physiology Antarctic fur seal shallow-water blackout NORTHERN ELEPHANT SEALS ACOUSTIC RECORDING TAG MARINE MAMMALS CEREBRAL TOLERANCE NITROGEN TENSIONS SIMULATED DIVES WEDDELL SEALS GAS-EXCHANGE DEPTH BUOYANCY |
spellingShingle |
marine mammal otariid diving physiology Antarctic fur seal shallow-water blackout NORTHERN ELEPHANT SEALS ACOUSTIC RECORDING TAG MARINE MAMMALS CEREBRAL TOLERANCE NITROGEN TENSIONS SIMULATED DIVES WEDDELL SEALS GAS-EXCHANGE DEPTH BUOYANCY Hooker, Sascha Kate Miller, Patrick Johnson, MP Cox, OP Boyd, Ian Lamont Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? |
topic_facet |
marine mammal otariid diving physiology Antarctic fur seal shallow-water blackout NORTHERN ELEPHANT SEALS ACOUSTIC RECORDING TAG MARINE MAMMALS CEREBRAL TOLERANCE NITROGEN TENSIONS SIMULATED DIVES WEDDELL SEALS GAS-EXCHANGE DEPTH BUOYANCY |
description |
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 (10-160m, 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. |
format |
Article in Journal/Newspaper |
author |
Hooker, Sascha Kate Miller, Patrick Johnson, MP Cox, OP Boyd, Ian Lamont |
author_facet |
Hooker, Sascha Kate Miller, Patrick Johnson, MP Cox, OP Boyd, Ian Lamont |
author_sort |
Hooker, Sascha Kate |
title |
Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? |
title_short |
Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? |
title_full |
Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? |
title_fullStr |
Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? |
title_full_unstemmed |
Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? |
title_sort |
ascent exhalations of antarctic fur seals: a behavioural adaptation for breath-hold diving? |
publishDate |
2005 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/ascent-exhalations-of-antarctic-fur-seals-a-behavioural-adaptation-for-breathhold-diving(398b46f4-1fa9-4563-81a9-860c52516710).html https://doi.org/10.1098/rspb.2004.2964 http://www.scopus.com/inward/record.url?scp=20144388224&partnerID=8YFLogxK |
geographic |
Antarctic Weddell |
geographic_facet |
Antarctic Weddell |
genre |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Elephant Seals Weddell Seals |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Antarctic Fur Seals Elephant Seals Weddell Seals |
op_source |
Hooker , S K , Miller , P , Johnson , MP , Cox , OP & Boyd , I L 2005 , ' Ascent exhalations of Antarctic fur seals: a behavioural adaptation for breath-hold diving? ' , Proceedings of the Royal Society of London Series B: Biological Sciences , vol. 272 , no. 1561 , pp. 355-363 . https://doi.org/10.1098/rspb.2004.2964 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1098/rspb.2004.2964 |
container_title |
Proceedings of the Royal Society B: Biological Sciences |
container_volume |
272 |
container_issue |
1561 |
container_start_page |
355 |
op_container_end_page |
363 |
_version_ |
1766247899042152448 |