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.fahl...@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.fahl...@tamucc.edu
web: http://www.comparative-physiology.tamucc.edu/
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