Fur seals do, but sea lions don't — cross taxa insights into exhalation during ascent from dives

Hooker, Sascha K, Andrews, Russel D, Arnould, John PY, Bester, Marthán N, Davis, Randall W, Insley, Stephen J, Gales, Nick J, Goldsworthy, Simon D and McKnight, J Chris 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, pp. 1-11, doi: 10.1098/rstb.2020.0219.

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Title Fur seals do, but sea lions don't — cross taxa insights into exhalation during ascent from dives
Author(s) Hooker, Sascha K
Andrews, Russel D
Arnould, John PYORCID iD for Arnould, John PY orcid.org/0000-0003-1124-9330
Bester, Marthán N
Davis, Randall W
Insley, Stephen J
Gales, Nick J
Goldsworthy, Simon D
McKnight, J Chris
Journal name Philosophical transactions of the Royal Society B: biological sciences
Volume number 376
Issue number 1830
Article ID 20200219
Start page 1
End page 11
Total pages 11
Publisher Royal Society
Place of publication London, Eng.
Publication date 2021-08-02
ISSN 0962-8436
Keyword(s) diving physiology
gas management
shallow-water blackout
Summary 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)’.
Language eng
DOI 10.1098/rstb.2020.0219
Indigenous content off
Field of Research 06 Biological Sciences
11 Medical and Health Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Persistent URL http://hdl.handle.net/10536/DRO/DU:30152802

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