dc.contributor.author |
Bester, Marthan Nieuwoudt
|
|
dc.contributor.author |
Ryan, Peter G.
|
|
dc.contributor.author |
Visagie, J.
|
|
dc.date.accessioned |
2010-07-19T06:31:49Z |
|
dc.date.available |
2010-07-19T06:31:49Z |
|
dc.date.issued |
2009 |
|
dc.description.abstract |
The onshore distributions and the abundances of Antarctic fur seals Arctocephalus gazella and
Subantarctic fur seals A. tropicalis were determined at Prince Edward Island during 16–20 December
2008. This repeats a survey conducted in December 2001 and extends the area surveyed to include
the entire south-west coast of Prince Edward Island. Of the two colonies of Antarctic fur seals, the
colony among Subantarctic fur seals north of Boggel Beach remained small, with increased numbers
of Subantarctic fur seals and putative hybrids. The other Antarctic fur seal breeding colony at Penguin
Beach remained free of Subantarctic fur seals and had expanded at a mean intrinsic rate of natural
increase of 11.4% per year from 2001. With an estimated 810 pups, the Antarctic fur seal is still in
the rapid recolonisation phase of population growth. The distribution of the more widespread and
abundant Subantarctic fur seals also had increased, with several new breeding colonies along the
east coast and one at Kent Crater on the west coast. The annual pup production was conservatively
estimated at 14 130 pups. The mean intrinsic rate of natural increase has declined to –0.3% per year
over the last seven years, compared to the 9.3% per year between 1987/1988 and 2001/2002, and the
population is in the mature phase of population growth. |
en |
dc.identifier.citation |
Bester, MN, Ryan, PG & Visagie, J 2009, 'Summer survey of fur seals at Prince Edward Island, southern Indian Ocean', African Journal of Marine Science, vol. 31, no. 3, pp. 1-5. [http://www.nisc.co.za/journals?id=10] |
en |
dc.identifier.issn |
1814-232X |
|
dc.identifier.uri |
http://hdl.handle.net/2263/14467 |
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dc.language.iso |
en |
en |
dc.publisher |
NISC |
en |
dc.rights |
NISC |
en |
dc.subject |
Arctocephalus |
en |
dc.subject |
Distribution |
en |
dc.subject |
Fur seals |
en |
dc.subject |
Population increase |
en |
dc.subject |
Prince Edward Island |
en |
dc.subject |
Subantarctic |
en |
dc.subject.lcsh |
Southern fur seals -- Prince Edward Island. |
en |
dc.subject.lcsh |
Seals (Animals) |
en |
dc.title |
Summer survey of fur seals at Prince Edward Island, southern Indian Ocean |
en |
dc.type |
Postprint Article |
en |