Pterodroma inexpectata


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Pterodroma inexpectata
Species Authority: (Forster, 1844)
Common Name(s):
English Mottled Petrel
Spanish Petrel Moteado

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.

2012 Near Threatened

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).

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
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Brooke (2004)

Population Trend: Decreasing

Habitat and Ecology [top]

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

Systems: Terrestrial; Marine

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. Version 2015.2. <>. Downloaded on 30 August 2015.
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