Fur seals do, but sea lions don't - Cross taxa insights into exhalation during ascent from dives
Management 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 oxy...
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ftdeakinunifig:oai:figshare.com:article/20657880 2024-06-23T07:47:43+00:00 Fur seals do, but sea lions don't - Cross taxa insights into exhalation during ascent from dives SK Hooker RD Andrews John Arnould MN Bester RW Davis SJ Insley NJ Gales SD Goldsworthy JC McKnight 2021-08-02T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30152802 https://figshare.com/articles/journal_contribution/Fur_seals_do_but_sea_lions_don_t_cross_taxa_insights_into_exhalation_during_ascent_from_dives/20657880 unknown http://hdl.handle.net/10536/DRO/DU:30152802 https://figshare.com/articles/journal_contribution/Fur_seals_do_but_sea_lions_don_t_cross_taxa_insights_into_exhalation_during_ascent_from_dives/20657880 All Rights Reserved Evolutionary biology not elsewhere classified Science & Technology Life Sciences & Biomedicine Biology Life Sciences & Biomedicine - Other Topics otariid shallow-water blackout diving physiology gas management ALVEOLAR GAS-EXCHANGE FLIPPER STROKE RATE DIVING BEHAVIOR FORAGING BEHAVIOR MAMMALIAN INSULATION THERMAL-PROPERTIES HEART-RATE NORTHERN PHYSIOLOGY LIMIT School of Life and Environmental Sciences 3103 Ecology 3109 Zoology Text Journal contribution 2021 ftdeakinunifig 2024-06-06T02:05:01Z Management 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. This article is part of the theme issue ‘Measuring physiology in free-living animals (Part I)’. Article in Journal/Newspaper Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella DRO - Deakin Research Online Antarctic The Antarctic |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Evolutionary biology not elsewhere classified Science & Technology Life Sciences & Biomedicine Biology Life Sciences & Biomedicine - Other Topics otariid shallow-water blackout diving physiology gas management ALVEOLAR GAS-EXCHANGE FLIPPER STROKE RATE DIVING BEHAVIOR FORAGING BEHAVIOR MAMMALIAN INSULATION THERMAL-PROPERTIES HEART-RATE NORTHERN PHYSIOLOGY LIMIT School of Life and Environmental Sciences 3103 Ecology 3109 Zoology |
spellingShingle |
Evolutionary biology not elsewhere classified Science & Technology Life Sciences & Biomedicine Biology Life Sciences & Biomedicine - Other Topics otariid shallow-water blackout diving physiology gas management ALVEOLAR GAS-EXCHANGE FLIPPER STROKE RATE DIVING BEHAVIOR FORAGING BEHAVIOR MAMMALIAN INSULATION THERMAL-PROPERTIES HEART-RATE NORTHERN PHYSIOLOGY LIMIT School of Life and Environmental Sciences 3103 Ecology 3109 Zoology SK Hooker RD Andrews John Arnould MN Bester RW Davis SJ Insley NJ Gales SD Goldsworthy JC McKnight Fur seals do, but sea lions don't - Cross taxa insights into exhalation during ascent from dives |
topic_facet |
Evolutionary biology not elsewhere classified Science & Technology Life Sciences & Biomedicine Biology Life Sciences & Biomedicine - Other Topics otariid shallow-water blackout diving physiology gas management ALVEOLAR GAS-EXCHANGE FLIPPER STROKE RATE DIVING BEHAVIOR FORAGING BEHAVIOR MAMMALIAN INSULATION THERMAL-PROPERTIES HEART-RATE NORTHERN PHYSIOLOGY LIMIT School of Life and Environmental Sciences 3103 Ecology 3109 Zoology |
description |
Management 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. This article is part of the theme issue ‘Measuring physiology in free-living animals (Part I)’. |
format |
Article in Journal/Newspaper |
author |
SK Hooker RD Andrews John Arnould MN Bester RW Davis SJ Insley NJ Gales SD Goldsworthy JC McKnight |
author_facet |
SK Hooker RD Andrews John Arnould MN Bester RW Davis SJ Insley NJ Gales SD Goldsworthy JC McKnight |
author_sort |
SK Hooker |
title |
Fur seals do, but sea lions don't - Cross taxa insights into exhalation during ascent from dives |
title_short |
Fur seals do, but sea lions don't - Cross taxa insights into exhalation during ascent from dives |
title_full |
Fur seals do, but sea lions don't - Cross taxa insights into exhalation during ascent from dives |
title_fullStr |
Fur seals do, but sea lions don't - Cross taxa insights into exhalation during ascent from dives |
title_full_unstemmed |
Fur seals do, but sea lions don't - Cross taxa insights into exhalation during ascent from dives |
title_sort |
fur seals do, but sea lions don't - cross taxa insights into exhalation during ascent from dives |
publishDate |
2021 |
url |
http://hdl.handle.net/10536/DRO/DU:30152802 https://figshare.com/articles/journal_contribution/Fur_seals_do_but_sea_lions_don_t_cross_taxa_insights_into_exhalation_during_ascent_from_dives/20657880 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella |
genre_facet |
Antarc* Antarctic Antarctic Fur Seal Arctocephalus gazella |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30152802 https://figshare.com/articles/journal_contribution/Fur_seals_do_but_sea_lions_don_t_cross_taxa_insights_into_exhalation_during_ascent_from_dives/20657880 |
op_rights |
All Rights Reserved |
_version_ |
1802651878320766976 |