Mergus australis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Anseriformes Anatidae

Scientific Name: Mergus australis Hombron & Jacquinot, 1841
Common Name(s):
English Auckland Merganser, Auckland Island Merganser
Taxonomic Source(s): Turbott, E.G. 1990. Checklist of the Birds of New Zealand. Ornithological Society of New Zealand, Wellington.

Assessment Information [top]

Red List Category & Criteria: Extinct ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Brooks, T., Khwaja, N., Mahood, S.
This species was formerly found on the Auckland Islands, New Zealand, but it is now Extinct, primarily due to hunting. It was last recorded in 1902, and had been lost by the time a reserve was set up on the islands in 1910.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Mergus australis was restricted to the Auckland Islands, New Zealand, by the time of its discovery in 1840 (Stattersfield et al. 1998), but subfossil remains of a Mergus species have also been found on South and Stewart Islands. At least 26 specimens were collected in total, the last in 1902 (Kear and Scarlett 1970); there have been no records since, despite intensive searches (Williams and Weller 1974).

Countries occurrence:
Regionally extinct:
New Zealand
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:No extant population remains.
Additional data:
Continuing decline of mature individuals:Unknown
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:It was largely a freshwater species, foraging in inland streams, estuaries and, occasionally, sheltered bays (Kear and Scarlett 1970).

Systems:Freshwater; Marine
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):7.3
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Its decline was presumably caused by a combination of hunting and predation by introduced pigs, rats, cats and dogs(Kear and Scarlett 1970) - the species's incipient flightlessness made it especially vulnerable (Livezey 1989b).

Citation: BirdLife International. 2016. Mergus australis. The IUCN Red List of Threatened Species 2016: e.T22680496A92864737. . Downloaded on 14 August 2018.
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