Polar Biology

, Volume 18, Issue 3, pp 214–218

Diving patterns of a Ross seal (Ommatophoca rossii ) near the eastern coast of the Antarctic Peninsula

  • John L. Bengtson
  • Brent S. Stewart
SHORT NOTE

DOI: 10.1007/s003000050178

Cite this article as:
Bengtson, J. & Stewart, B. Polar Biol (1997) 18: 214. doi:10.1007/s003000050178

Abstract

In January 1987 we documented the diving patterns of a female Ross seal (Ommatophoca rossii) in the marginal pack-ice zone near the eastern coast of the Antarctic Peninsula for 2 days using a microprocessor-based time-depth recorder. The seal hauled out during the day and dived continually when in the water at night. Dives averaged 110 m deep and 6.4 min long; the deepest dive was 212 m and the longest 9.8 min. Dives were deepest near twilight and shallowest at night; this pattern suggests that the seal's prey, presumably mid-water squid and fish, may have been making vertical migrations or changing predator-avoidance behavior in response to diel light patterns. The dives of this Ross seal were substantially deeper, on average, than those of crabeater seals (Lobodon carcinophagus), which forage in the same areas on Antarctic krill (Euphausia superba).

Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • John L. Bengtson
    • 1
  • Brent S. Stewart
    • 2
  1. 1.National Marine Mammal Laboratory, Alaska Fisheries Science Center, NMFS, NOAA, 7600 Sand Point Way N.E., Seattle, WA 98115, USA FAX: +1 (206) 526-6615; e-mail: john.bengtson@noaa.govUS
  2. 2.Hubbs-Sea World Research Institute, 2595 Ingraham Street, San Diego, CA 92109, USA US