IUCN Red List of Threatened Species:  Mergus australis

Mergus australis

Summary | Distribution | Other Documentation | References | Comprehensive

Taxonomy
Kingdom ANIMALIA
Phylum CHORDATA
Class AVES
Order ANSERIFORMES
Family ANATIDAE
Common Name/s AUCKLAND ISLAND MERGANSER (E)
Species Authority Hombron & Jacquinot, 1841
Assessment Information
Red List Category & Criteria EX    ver 3.1 (2001)
Year Assessed 2004
Assessor/s BirdLife International
Evaluator/s Stattersfield, A. (BirdLife International Red List Authority) & Brooks, T. (Conservation International)
Justification Auckland Island Merganser Mergus australis was restricted to the Auckland Islands, New Zealand, by the time of its discovery in 1840, but subfossil remains of a Mergus species have also been found on South and Stewart Islands. It was largely a freshwater species, foraging in inland streams, estuaries and, occasionally, sheltered bays. Its decline was presumably caused by a combination of hunting and predation by introduced pigs, rats, cats and dogs—the species' incipient flightlessness made it especially vulnerable. At least 26 specimens were collected in total, the last in 1902; there have been no records since, despite intensive searches.
History
1988-Extinct (IUCN Conservation Monitoring Centre 1988)
1994-Extinct (Groombridge 1994)
2000-Extinct (BirdLife International 2000)
Summary Documentation
System Freshwater
Major Threat/s
(terms)
2.2Invasive alien species (directly affecting the species) - Predators (past)
3.7Harvesting (hunting/gathering) - Unknown (past)

Citation: BirdLife International 2004. Mergus australis. In: IUCN 2006. 2006 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 10 March 2007.
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