Ardenna tenuirostris 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Procellariiformes Procellariidae

Scientific Name: Ardenna tenuirostris (Temminck, 1835)
Common Name(s):
English Short-tailed Shearwater
Ardenna tenuirostris ssp. tenuirostris — Christidis and Boles (2008)
Puffinus tenuirostris (Temminck, 1835)
Taxonomic Source(s): Turbott, E.G. 1990. Checklist of the Birds of New Zealand. Ornithological Society of New Zealand, Wellington.
Taxonomic Notes: Ardenna tenuirostris (del Hoyo and Collar 2014) was previously placed in the genus Puffinus.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2017
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Facilitator/Compiler(s): Butchart, S., Calvert, R., Ekstrom, J. & Newton, P.
This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km2 combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation).  Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations).  The population size is extremely large, and hence does not approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure).  For these reasons the species is evaluated as Least Concern.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species breeds on Tasmania and off the coast of south Australia, with the bulk of the population in the south-east.  It undergoes transequatorial migration, wintering north of Japan near the Aleutian Islands (USA), with some moving north of the Bering Strait.  The return migration route incorporates the central Pacific, with some moving down the western coast of North America.

Countries occurrence:
Antarctica; Australia; Canada; Costa Rica; Fiji; Guam; India; Japan; Korea, Republic of; Marshall Islands; Mexico; Micronesia, Federated States of ; New Zealand; Northern Mariana Islands; Russian Federation (Eastern Asian Russia); Solomon Islands; Sri Lanka; United States
Mauritius; Thailand
Present - origin uncertain:
American Samoa; Cook Islands; French Polynesia; Kiribati; Nauru; New Caledonia; Niue; Norfolk Island; Papua New Guinea; Pitcairn; Samoa; Tokelau; Tonga; Tuvalu; United States Minor Outlying Islands; Vanuatu; Wallis and Futuna
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:155000000
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:Brooke (2004) estimated the global population to number > c.23,000,000 individuals, while national population estimates include: < c.1,000 individuals on migration in Taiwan; >c.1,000 individuals on migration in Japan and >c.1,000 individuals on migration in Russia (Brazil 2009).

Trend Justification:  Although the population trend is increasing in North America (based on BBS/CBC data: Butcher and Niven 2007), the global population is suspected to be in decline owing to ecosystem changes resulting from climate change (Brooke 2004).
Current Population Trend:Decreasing
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:Breeding occurs mainly on coastal islands, typically in areas of grassland or other vegetation, but sometimes cliffs or bare ground (del Hoyo et al. 1992).  Whilst breeding, the species alternates short foraging trips to local waters with long foraging trips (up to 17 days) to the Polar Frontal Zone.  Short trips allow greater chick provisioning at the sacrifice of body condition, which is then recovered in richer sub-Antarctic waters.  Diet includes fish (particularly mycotphids), crustaceans and squid (Weimerskirch and Cherel 1998).  Feeding occurs in flocks of up to 20,000 birds, and it has been seen in association with cetaceans.  It is a trans-equatorial migrant, wintering off Aleutian Islands, some moving north of Bering Strait (del Hoyo et al. 1992).
Systems:Terrestrial; Marine
Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):18.5
Movement patterns:Full Migrant
Congregatory:Congregatory (and dispersive)

Amended [top]

Amended reason: Map revised.

Citation: BirdLife International. 2017. Ardenna tenuirostris (amended version of 2016 assessment). The IUCN Red List of Threatened Species 2017: e.T22698216A110676140. . Downloaded on 20 June 2018.
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