Research Papers

Prey and seasonal abundance of killer whales at sub-Antarctic Marion Island

Published in: African Journal of Marine Science
Volume 33 , issue 1 , 2011 , pages: 99–105

DOI: 10.2989/1814232X.2011.572356

Author(s): RR Reisinger Mammal Research Institute, Department of Zoology and Entomology, South Africa , PJN de Bruyn , CA Tosh , WC Oosthuizen , NT Mufanadzo , MN Bester

Keywords: Orcinus orca , seals , diet , foraging , Southern Ocean , seasonal occurrence

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Abstract

The diet of killer whales Orcinus orca was investigated from 48 predation events observed during 823 sightings at sub-Antarctic Marion Island between 2006 and 2009. From these events, there were 10 cases where prey could be identified. Killer whales fed on fur seals Arctocephalus tropicalis, elephant seals Mirounga leonina and penguins. Constant effort (dedicated) observations (259 hours, 2008–2009) showed that the peak in killer whale abundance was between September and December with a secondary peak between April and May, which coincided with peaks in the abundance of seals and penguins.

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