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RESEARCH ARTICLE
Contents Vol 32(1)

Diving behaviour of two Ross seals off east Antarctica

Colin Southwell
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Australian Antarctic Division, Department of the Environment and Heritage, Channel Highway, Kingston, Tas. 7050, Australia. Email: colin.southwell@aad.gov.au

Wildlife Research 32(1) 63-65 https://doi.org/10.1071/WR03090
Submitted: 25 September 2003  Accepted: 20 September 2004   Published: 25 February 2005

Abstract

The Ross seal (Ommatophoca rossii) is the least frequently sighted and least known of the Antarctic pinnipeds. Current knowledge of foraging and diving behaviour is based on observations of a single seal over <2 days. The current study provides some additional data on the diving behaviour of two Ross seals off east Antarctica over periods of 31 and 12 days during December–January 1999–2000 using satellite-linked dive recorders. Both seals remained over the continental shelf for these times, the female remaining some distance from the coast and the male moving close to the coast approximately half-way through his transmission period. Most dives by the female reached depths >150 m (maximum depth 372 m) and the modal duration was 10–11 min. The male’s dives were slightly shallower (most >100 m) and shorter (mode 6–7 min) when distant from the continental coast, and were truncated to a depth of 180 m when close to the coast, presumably by the sea floor. These dive patterns suggest that their prey species, thought to comprise mostly fish and squid, were relatively unavailable at depths <100 m.


Acknowledgments

I thank Julie Barnes, Rick Van Veen, Brendan Hill, Garry Clothier, David Taylor and Mark Fletcher for their assistance in capturing seals, and the captain and crew of the MV Aurora Australis. This work was undertaken under permit 99/2 of the Commonwealth of Australia Antarctic Seals Conservation Regulations and was approved by the Antarctic Animal Ethics Committee. The manuscript was improved by comments from Judy Clarke and an anonymous referee.


References

Bengtson, J. L. , and Stewart, B. S. (1992). Diving and haulout behavior of crabeater seals in the Weddell Sea, Antarctica, during March 1986. Polar Biology 12, 635–644.
| Crossref | GoogleScholarGoogle Scholar | Gilbert J. R., and Erickson A. W. (1977). Distribution and abundance of seals in the pack ice of the Pacific sector of the Southern Ocean. In ‘Adaptations within Antarctic Ecosystems’. (Ed. L. Llano.) pp. 703–740. (Smithsonian Institute: Washington, DC.)

Norday, E. S. , Folkow, L. , and Blix, A. S. (1995). Distribution and diving behaviour of crabeater seals (Lobodon carcinophagus) off Queen Maud Land. Polar Biology 15, 261–268.
Øritsland T. (1970). Sealing and seal research in the south west Atlantic pack ice, Sept–Oct 1964. In ‘Antarctic Ecology’. (Ed. M. W. Holdgate.) pp. 367–376. (Academic Press: London.)

Øritsland T. (1977). Food consumption of seals in the Antarctic pack ice. In ‘Adaptations Within Antarctic Ecosystems’. (Ed. G. A. Llano.) pp. 749–768. (Smithsonian Institute: Washington, DC.)

Skinner, J. D. , and Klages, N. T. W. (1994). On some aspects of the biology of the Ross seal Ommatophoca rossii from King Haakon VII Sea, Antarctica. Polar Biology 14, 467–472.
| Crossref | GoogleScholarGoogle Scholar |

Southwell, C. (2003). Haul-out behaviour of two Ross seals off eastern Antarctica. Antarctic Science 15, 257–258.
| Crossref | GoogleScholarGoogle Scholar |

Testa, J. W. (1994). Over-winter movements and diving behaviour of female Weddell seals (Leptonychotes weddelli) in the southwestern Ross Sea, Antarctica. Canadian Journal of Zoology 72, 1700–1710.


Thomas, J. , DeMaster, D. , Stone, S. , and Andriashek, D. (1980). Observations of a newborn Ross seal pup (Ommatophoca rossii) near the Antarctic peninsula. Canadian Journal of Zoology 58, 2156–2158.