Auckland Islands Merganser
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| Mergus australis Hombron & Jacquinot, 1841 |
The Auckland Islands Merganser, Mergus australis, was a typical merganser which is now extinct.
This duck was similar in size to the Red-breasted Merganser. The adult male had a dark reddish-brown head, crest and neck, with bluish black mantle and tail and slate grey wings. The female was slightly smaller with a shorter crest.
This bird was first collected when a French expedition led by the explorer Jules Dumont d'Urville on the ships L'Astrolabe and La Zelee visited the Auckland Islands in 1840. Its decline was caused by a combination of hunting and predation by introduced mammals. The bird was not flightless, but rather hard to flush; it preferred to hide between rocks when pursued. The last sighting was of a pair shot on January 9, 1902. It was not found in a 1909 search, and a thorough 1972/1973 exploration of possible habitat concluded that it was long extinct (Williams & Weller, 1974).
Subsequent fossil discoveries suggest that this merganser was previously resident on the South Island and Stewart Island in New Zealand. Fossils of a subspecies or closely related species have also been found on the Chatham Islands. There exists a short remark mentioning "a merganser" found on Campbell Island in McCormick (1842), but this may just as well refer to the semi-marine Campbell Island Teal which is otherwise missing in his notes: he only mentions the Pacific Black Duck ("a New Zealand species of duck").
[edit] References
- BirdLife International (2004). Mergus australis. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 05 May 2006. Database entry includes justification for why this species is listed as extinct
- McCormick, Robert (1842): A sketch of the Antarctic regions, embracing a few passing remarks, geographical and ornithological. Tasmanian Journal of Natural Sciences 1(4): 241-247. PDF fulltext
- Williams, G. R. & Weller, M. W.. (1974): Unsuccessful search for the Auckland Islands Merganser (Mergus australis). Notornis 21(3): 246-249. PDF fulltext
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