liu.seSearch for publications in DiVA
Change search
ReferencesLink to record
Permanent link

Direct link
Metabolic costs of foraging and the management of O2 and CO2 stores in Steller sea lions
University of British Columbia.
Linköping University, The Institute of Technology. Linköping University, Department of Biomedical Engineering.
University of British Columbia.
University of British Columbia.
Show others and affiliations
2008 (English)In: The Journal of Experimental Biology, ISSN 0022-0949, Vol. 211, 3573-3580 p.Article in journal (Refereed) Published
Abstract [en]

The metabolic costs of foraging and the management of O2 and CO2 stores during breath-hold diving was investigated in three female Steller sea lions (Eumetopias jubatus) trained to dive between 10 and 50 m (N=1142 dives). Each trial consisted of two to eight dives separated by surface intervals that were determined by the sea lion (spontaneous trials) or by the researcher (conditioned trials). During conditioned trials, surface intervals were long enough for O2 to return to pre-dive levels between each dive. The metabolic cost of each dive event (dive+surface interval; DMR) was measured using flow-through respirometry. The respiratory exchange ratio (O2/CO2) was significantly lower during spontaneous trials compared with conditioned trials. DMR was significantly higher during spontaneous trials and decreased exponentially with dive duration. A similar decrease in DMR was not as evident during conditioned trials. DMR could not be accurately estimated from the surface interval (SI) following individual dives that had short SIs (<50 s), but could be estimated on a dive by dive basis for longer SIs (>50 s). DMR decreased by 15%, but did not differ significantly from surface metabolic rates (MRS) when dive duration increased from 1 to 7 min. Overall, these data suggest that DMR is almost the same as MRS, and that Steller sea lions incur an O2 debt during spontaneous diving that is not repaid until the end of the dive bout. This has important consequences in differentiating between the actual and `apparent' metabolic rate during diving, and may explain some of the differences in metabolic rates reported in pinniped species.

Place, publisher, year, edition, pages
Cambridge: The Company of Biologists , 2008. Vol. 211, 3573-3580 p.
Keyword [en]
field metabolic rate, diving physiology, marine mammal, hypometabolism, physiological plasticity
National Category
Natural Sciences
URN: urn:nbn:se:liu:diva-52945DOI: 10.1242/jeb.023655OAI: diva2:286241
Available from: 2010-01-14 Created: 2010-01-14 Last updated: 2010-01-22

Open Access in DiVA

No full text

Other links

Publisher's full text
By organisation
The Institute of TechnologyDepartment of Biomedical Engineering
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 25 hits
ReferencesLink to record
Permanent link

Direct link