Pterodroma inexpectata 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Procellariiformes Procellariidae

Scientific Name: Pterodroma inexpectata
Species Authority: (Forster, 1844)
Common Name(s):
English Mottled Petrel
Spanish Petrel Moteado
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Lynx Edicions BirdLife International.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2014
Date Assessed: 2012-06-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S.
Facilitator/Compiler(s): Mahood, S., McClellan, R., O'Brien, A., Taylor, J. & Symes, A.
This poorly known seabird breeds on only a few moderately small islands; on a number of these there are introduced predators and the population is therefore thought to be declining. It is consequently classified as Near Threatened.

Previously published Red List assessments:
2012 Near Threatened (NT)
2010 Near Threatened (NT)
2008 Near Threatened (NT)
2004 Near Threatened (NT)
2000 Lower Risk/near threatened (LR/nt)
1994 Lower Risk/least concern (LR/lc)
1988 Lower Risk/least concern (LR/lc)

Geographic Range [top]

Range Description: Pterodroma inexpectata is endemic to New Zealand. It breeds on islands off Fiordland, the Solander Islands, Foveaux Strait islands, islands around Stewart Island (including Titi islands, Codfish, Big South Cape Islands, and islets in Port Pegasus) and the Snares Islands (Marchant and Higgins 1990, Heather and Robertson 1997). It once bred throughout the North and South Islands, and possibly the Chatham, Bounty, Antipodes and Auckland Islands (Marchant and Higgins 1990, Heather and Robertson 1997). There are c.10,000+ pairs on each of Big South Cape and Main Islands (Heather and Robertson 1997), and the Codfish population was estimated at 300,000-400,000 pairs in 1996 (Taylor 2000). It migrates to the north Pacific as far as the subarctic front and Bering Sea and in summer can range as far south as the pack ice (Marchant and Higgins 1990, Heather and Robertson 1997).

Countries occurrence:
Antarctica; Australia; Fiji; Marshall Islands; New Zealand; United States
Ecuador; Japan; Russian Federation
Present - origin uncertain:
American Samoa (American Samoa); Canada; Chile; Cook Islands; French Polynesia; Kiribati; Mexico; Micronesia, Federated States of ; Nauru; New Caledonia; Niue; Norfolk Island; Pitcairn; Samoa; Solomon Islands; Tokelau; Tonga; Tuvalu; United States Minor Outlying Islands; Vanuatu; Wallis and Futuna
Continuing decline in area of occupancy (AOO): Unknown
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 108000000
Continuing decline in extent of occurrence (EOO): Unknown
Extreme fluctuations in extent of occurrence (EOO): No
Continuing decline in number of locations: Unknown
Extreme fluctuations in the number of locations: No
Upper elevation limit (metres): 350
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Brooke (2004)

Trend Justification:  There are no data, the species is thought to be declining due to the depredations of introduced predators on the breeding grounds.

Current Population Trend: Decreasing
Additional data:
Continuing decline of mature individuals: Unknown
Extreme fluctuations: No Population severely fragmented: No
Continuing decline in subpopulations: Unknown
Extreme fluctuations in subpopulations: No All individuals in one subpopulation: No
No. of individuals in largest subpopulation: 100

Habitat and Ecology [top]

Habitat and Ecology: It breeds in burrows on remote offshore islands and otherwise ranges widely at sea.

Systems: Terrestrial; Marine
Continuing decline in area, extent and/or quality of habitat: Unknown
Generation Length (years): 15.6
Movement patterns: Full Migrant
Congregatory: Congregatory (and dispersive)

Threats [top]

Major Threat(s): Weka Gallirallus australis have been introduced to several colonies, and have caused significant losses on Codfish Island (Taylor 2000). Black rat Rattus rattus is present on Big South Cape Island, and may have a severe impact on breeding success. Some populations are on islands that are regularly harvested for Sooty Shearwater Puffinus griseus chicks, and the impact of trampling of burrows and incidental take is not known (Heather and Robertson 1997, Taylor 2000).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
None is known.

Conservation Actions Proposed
Monitor suitable colonies to assess population trends. Complete pest plan to prevent and enable rapid responses to new species introductions. Eradicate G. australis from Big Solander Island, and G. australis and R. rattus from Big South Cape Island, on agreement with owners. Asses the impact of the P. griseus harvest on populations.

Citation: BirdLife International. 2014. Pterodroma inexpectata. The IUCN Red List of Threatened Species 2014: e.T22697963A62503189. . Downloaded on 25 November 2015.
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