Skip to main content
padlock icon - secure page this page is secure

An assessment of the impact of predation by Cape fur seals Arctocephalus pusillus pusillus on seabirds at Dyer Island, South Africa

Buy Article:

$61.00 + tax (Refund Policy)

At Dyer Island, South Africa, observations of predation of seabirds by Cape Fur Seals Arctocephalus pusillus pusillus were made during 2004 and 2006/07. It was estimated that seals killed about 7% of adult African Penguins Spheniscus demersus annually. This may have contributed to the penguin colony not increasing in spite of food becoming more available in its vicinity during an eastward shift of epipelagic fish resources off South Africa at the start of the twenty-first century. Adult penguins were most susceptible to mortality in the breeding season as they returned to feed chicks in the evening. Seals also killed substantial numbers (3–9%) of Cape Cormorant Phalacrocorax capensis fledglings as they left the island, mostly in the morning. The losses of Cape Cormorant fledglings accounted for about 95% of the overall mortality of seabirds attributable to seals. Mortality inflicted by seals on adults of four species of cormorant was negligible and no predation by seals on gulls and terns was observed.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
No Metrics

Keywords: African Penguin; Cape Cormorant; Cape fur seal; Crowned Cormorant; White-breasted Cormorant; predation mortality

Document Type: Research Article

Affiliations: 1: Branch Oceans and Coasts, Department of Environmental Affairs, PO Box 52126, Cape Town, 8000, South Africa 2: CapeNature, 16 Seventeenth Avenue, Voëlklip, Hermanus, 7200, South Africa 3: Animal Demography Unit, Department of Biological Sciences, University of Cape Town, Rondebosch, 7701, South Africa

Publication date: December 1, 2013

More about this publication?
  • Co-Published by NISC and Taylor & Francis - Subscriber access available here
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more