Polar Biology

, Volume 29, Issue 4, pp 303–307 | Cite as

Diving physiology and winter foraging behavior of a juvenile leopard seal (Hydrurga leptonyx)

  • Carey E. Kuhn
  • Birgitte I. McDonald
  • Scott A. Shaffer
  • Julie Barnes
  • Daniel E. Crocker
  • Jennifer Burns
  • Daniel P. Costa
Original Paper

Abstract

Diving physiology and at-sea behavior of a juvenile leopard seal (Hydrurga leptonyx) were opportunistically measured in the Antarctic Peninsula during winter 2002. Total body oxygen stores were estimated from measures of hematocrit, hemoglobin, myoglobin, and total blood volume and were used to calculate an aerobic dive limit (ADL). Movement patterns and diving behavior were measured by equipping the seal with a Satellite Relay Data Logger that transmitted data from 8–31 August 2002. The seal remained in a focal area, in contrast to crabeater seals tracked simultaneously. The seal displayed short, shallow dives (mean 2.0±1.4 min, 44±48 m) and spent 99.9% of its time within the estimated ADL of 7.4 min. The shallow diving behavior contradicts previous diet research suggesting Antarctic krill (Euphausia superba) is the primary prey of leopard seals during the winter months as krill were found at deeper depths during this period. These measurements of diving and movement of a leopard seal provide valuable preliminary data necessary to develop future research on the at-sea behavior of an apex predator in the Antarctic ecosystem.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Carey E. Kuhn
    • 1
  • Birgitte I. McDonald
    • 1
  • Scott A. Shaffer
    • 1
  • Julie Barnes
    • 2
  • Daniel E. Crocker
    • 3
  • Jennifer Burns
    • 4
  • Daniel P. Costa
    • 1
  1. 1.Department of Ecology and Evolutionary BiologyUniversity of CaliforniaSanta CruzUSA
  2. 2.Veterinary and Quarantine CentreMosmanAustralia
  3. 3.Department of BiologySonoma State UniversityRohnert Park94928USA
  4. 4.Department of Biological SciencesUniversity of AlaskaAnchorage99508USA

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