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Journal of Comparative Physiology B

, Volume 187, Issue 3, pp 503–516 | Cite as

Swimming metabolic rates vary by sex and development stage, but not by species, in three species of Australian otariid seals

  • Monique A. LaddsEmail author
  • David J. Slip
  • Robert G. Harcourt
Original Paper

Abstract

Physiology may limit the ability for marine mammals to adapt to changing environments. Depth and duration of foraging dives are a function of total available oxygen stores, which theoretically increase as animals grow, and metabolic costs. To evaluate how physiology may influence the travelling costs for seals to foraging patches in the wild, we measured metabolic rates of a cross-section of New Zealand fur seals, Australian fur seals and Australian sea lions representing different foraging strategies, development stages, sexes and sizes. We report values for standard metabolic rate, active metabolic rate (obtained from submerged swimming), along with estimates of cost of transport (COT), measured via respirometry. We found a decline in mass-specific metabolic rate with increased duration of submerged swimming. For most seals mass-specific metabolic rate increased with speed and for all seals mass-specific COT decreased with speed. Mass-specific metabolic rate was higher for subadult than adult fur seals and sea lions, corresponding to an overall higher minimum COT. Some sex differences were also apparent, such that female Australian fur seals and Australian sea lions had higher mass-specific metabolic rates than males. There were no species differences in standard or active metabolic rates for adult males or females. The seals in our study appear to operate at their physiological optimum during submerged swimming. However, the higher metabolic rates of young and female fur seals and sea lions may limit their scope for increasing foraging effort during times of resource limitation.

Keywords

Energetics Otariid Foraging strategy Cost of transport 

Abbreviations

COT

Cost of transport

sSMR

Mass-specific standard metabolic rate

sAMR

Mass-specific active metabolic rate

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

Rate of oxygen consumption

CO2

Carbon dioxide

Mb

Mass

Notes

Acknowledgements

We thank all of the curatorial staff at Dolphin Marine Magic, Underwater World Mooloolaba and Taronga Zoo for their invaluable assistance with data collection, training the seals and ongoing commitment to this project. This project is funded by Australian Research Council Linkage Grant [Grant No. LP110200603] to RH and DS, with support from Taronga Conservation Society Australia. ML is a recipient of a Macquarie University Research Excellence Scholarship. All experiments were conducted under the current laws of Australia authorised under New South Wales Office of Environment and Heritage Scientific Licence SL100746 to RH.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Monique A. Ladds
    • 1
    Email author
  • David J. Slip
    • 1
    • 2
  • Robert G. Harcourt
    • 1
  1. 1.Marine Predator Research Group, Department of Biological SciencesMacquarie UniversityNorth RydeAustralia
  2. 2.Taronga Conservation Society AustraliaMosmanAustralia

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