Abstract

Abstract The history, distribution and numbers of southern elephant seals (Mirounga leonina) in New Zealand are reviewed, The small populations that breed on Campbell and Antipodes Islands, and the very few that occasionally pup on the New Zealand mainland, are part of the larger Macquarie Island stock. A comparison of recent and earlier counts has revealed a 97% reduction in the breeding population at Campbell Island since 1947. There has been a decline in the number and size of breeding harems, and in pup production: from 191 pups in 1947 down to 5 in 1986. Little is known of the Antipodes Island population but, with 113 pups in 1978, this may now be the main breeding population in New Zealand. Breeding populations at Macquarie Island, and at many other locations throughout the subantarctic zone of the Indian and Pacific Oceans, have also recently declined. Reasons for these changes are unknown, but possible causal factors in the marine environment are discussed.

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