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Validating the relationship between 3-dimensional body acceleration and oxygen consumption in trained Steller sea lions

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Abstract

We tested the ability of overall dynamic body acceleration (ODBA) to predict the rate of oxygen consumption (\(s\dot{V}_{{{\text{O}}_{2} }}\)) in freely diving Steller sea lions (Eumetopias jubatus) while resting at the surface and diving. The trained sea lions executed three dive types—single dives, bouts of multiple long dives with 4–6 dives per bout, or bouts of multiple short dives with 10–12 dives per bout—to depths of 40 m, resulting in a range of activity and oxygen consumption levels. Average metabolic rate (AMR) over the dive cycle or dive bout calculated was calculated from \(s\dot{V}_{{{\text{O}}_{2} }}\). We found that ODBA could statistically predict AMR when data from all dive types were combined, but that dive type was a significant model factor. However, there were no significant linear relationships between AMR and ODBA when data for each dive type were analyzed separately. The potential relationships between AMR and ODBA were not improved by including dive duration, food consumed, proportion of dive cycle spent submerged, or number of dives per bout. It is not clear whether the lack of predictive power within dive type was due to low statistical power, or whether it reflected a true absence of a relationship between ODBA and AMR. The average percent error for predicting AMR from ODBA was 7–11 %, and standard error of the estimated AMR was 5–32 %. Overall, the extensive range of dive behaviors and physiological conditions we tested indicated that ODBA was not suitable for estimating AMR in the field due to considerable error and the inconclusive effects of dive type.

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Abbreviations

Mb :

Body mass (kg)

ODBA:

Overall dynamic body acceleration averaged over dive cycle or dive bout (g, 1 g = 9.81 m s2)

\(V_{{{\text{O}}_{2} }}\) :

Total oxygen consumption

\(\dot{V}_{{{\text{O}}_{2} }}\) :

Whole animal rate of oxygen consumption rate (ml O2 min−1)

\(s\dot{V}_{{{\text{O}}_{2} }}\) :

Mass-corrected rate of oxygen consumption rate (ml O2 min−1 kg−0.75)

MRs:

Surface metabolic rate ~2 min prior to diving (ml O2 min−1 kg−0.75)

AMR:

Average metabolic rate over dive cycle or dive bout calculated from \(s\dot{V}_{{{\text{O}}_{2} }}\) (ml O2 min−1 kg−0.75)

DLW:

Doubly labeled water

cADL:

Calculated aerobic dive limit

Dive cycle:

Single dive + 1 surface interval until \(s\dot{V}_{{{\text{O}}_{2} }}\) within 5 % of pre-dive MRs

Dive bout:

Series of dives + surface intervals until final \(s\dot{V}_{{{\text{O}}_{2} }}\) within 5 % of pre-dive MRs. Surface intervals within a dive bout do not return to within 5 % of MRs

Bout of short dives:

10 or 12 dives per dive bout; goal of 1–2 min per dive

Bout of long dives:

4–6 dives per dive bout; goal of 4–6 min per dive

Single dives:

1 dive cycle with a dive duration goal of 4–6 min

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Acknowledgments

We thank the technicians and the training staff at the UBC Open Water Research Station and the Vancouver Aquarium for assisting with data collection and training the sea lions. We also thank Brian Battaile and Brianna Wright for R code collaboration, and are grateful to Carling Gerlinsky, Alex Dalton, and Elizabeth Goundie for data collection assistance and comments on this manuscript. Financial support was provided by a grant from the North Pacific Marine Science Foundation to the North Pacific Universities Marine Mammal Research Consortium (NA08NMF4390474 and NA11NMF4390124). Graduate support to BLV was provided by a Deakin University Postgraduate Research Scholarship. All data collection was conducted under the UBC Animal Care Permit #A11-0397.

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Correspondence to Beth L. Volpov.

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Communicated by G. Heldmaier.

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Volpov, B.L., Rosen, D.A.S., Trites, A.W. et al. Validating the relationship between 3-dimensional body acceleration and oxygen consumption in trained Steller sea lions. J Comp Physiol B 185, 695–708 (2015). https://doi.org/10.1007/s00360-015-0911-y

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