Increasing abundance of pups of the long-nosed fur seal (Arctocephalus forsteri) on Kangaroo Island, South Australia, over 26 breeding seasons to 2013–14
Peter D. Shaughnessy A B C and Simon D. Goldsworthy B
+ Author Affiliations
- Author Affiliations
A South Australian Museum, North Terrace, Adelaide, SA 5000, Australia; formerly CSIRO Wildlife and Ecology, Canberra, Australia.
B South Australian Research and Development Institute (SARDI), 2 Hamra Avenue, West Beach, SA 5024, Australia.
C Corresponding author. Email: peter.shaughnessy@samuseum.sa.gov.au
Wildlife Research 42(8) 619-632 https://doi.org/10.1071/WR14209
Submitted: 13 October 2014 Accepted: 17 September 2015 Published: 2 December 2015
Abstract
Context: Long-nosed (or New Zealand) fur seals breed on the southern coast of Australia, in New Zealand and on its subantarctic islands. They are recovering from over-harvesting that occurred in the early nineteenth century.
Aims: We estimated the rate of increase of the population at two colonies on Kangaroo Island, South Australia: Cape Gantheaume and Cape du Couedic.
Methods: From 1988–89 to 2013–14, pup abundance was estimated using a mark–resight procedure with multiple resights in large aggregations of pups and by direct counting in small aggregations.
Key results: At Cape Gantheaume, pup numbers increased by a factor of 10.7 from 457 to 5333 over 26 breeding seasons and the exponential rate of increase averaged 10.0% per annum (p.a.). Between 1988–89 and 1997–98, the population increased at 17.3% p.a., after which the increase was 7.2% p.a. At Cape du Couedic, pup numbers increased by a factor of 12.8 from 295 to 4070 over 21 breeding seasons at 11.4% p.a. Between 1988–89 and 1997–98, the increase averaged 14.2% p.a., after which it was 9.6% p.a. These increases have been accompanied by expansion in sub-colonies that existed in January 1989 and establishment of several new sub-colonies. Increases are likely to continue on Kangaroo Island.
Conclusions: There are few examples of increasing population levels for Australian native mammals and this is one of the best documented. It demonstrates that fur seal populations can recover from uncontrolled harvesting provided breeding habitat ashore is protected.
Implications: Fur seals interfere with fishers, disturb farmed tuna in aquaculture pens, and prey on little penguins.
Additional keywords: New Zealand fur seal, population recovery, pup weights, pup mortality.
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