[MARMAM] New Publication: Activity as a proxy to estimate metabolic rate and to, partition the metabolic cost of diving vs. breathing in, pre- and post-fasted Steller sea lions

Andreas Fahlman andreas.fahlman at tamucc.edu
Thu May 30 09:13:45 PDT 2013


Dear All
The following paper was recently published in Aquatic Biology
Title: Activity as a proxy to estimate metabolic rate and to partition 
the metabolic cost of diving vs. breathing in pre- and post-fasted 
Steller sea lions
Authors: Fahlman, A., Svärd, C., Rosen, D. A. S., Wilson, R. P., Trites, 
A. W.
Journal: Aquatic Biology, Vol. 18: 175–184, 2013
doi: 10.3354/ab00500

Abstract: Three Steller sea lions Eumetopias jubatus, trained to dive 
voluntarily to depths ranging from 10 to 50 m, were used to determine 
whether the relationship between activity and
metabolic rate during a diving interval (MRDI, dive + surface interval) 
was affected by fasting (9 d) during the breeding season (spring through 
summer). We subsequently used the relationship between activity and MRDI 
to partition the metabolic costs between underwater breath-holding 
activity and surface breathing activities. We estimated activity from 
overall dynamic body acceleration (ODBA) measured using a 3-axis 
accelerometer, and measured MRDI using flow-through respirometry. The 
relationship between ODBA-based activity and MRDI was not affected by 
fasting period, suggesting that ODBA can be used to predict energy 
expenditure regardless of nutritional state in the spring and summer. 
However, the relationship between ODBA and dive metabolic rate differs 
from the relationship between ODBA and the surface metabolic rate before 
diving. Partitioning MRDI into the metabolic cost of remaining at the 
surface versus swimming underwater suggests that the metabolic cost of 
diving for Steller sea lions is approximately 29% lower than when 
breathing at the surface. ODBA appears to be a reasonable proxy to 
estimate metabolic rate in marine mammals, but more detailed behavioral 
data may be required to accurately apply the method in the field.

If you would like a copy, please send an e-mail to: 
andreas.fahlman at tamucc.edu

Sincerely,
Andreas

-- 
Andreas Fahlman
Department of Life Sciences
Texas A&M- Corpus Christi
6300 Ocean Dr Unit 5892
Corpus Christi, TX 78412
Ph. +1-361-825-3489
Fax +1-361-825-2025
mail: andreas.fahlman at tamucc.edu
web: http://www.comparative-physiology.tamucc.edu/



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