NT
Mottled Petrel Pterodroma inexpectata



Taxonomy

Taxonomic source(s)
Brooke, M. de L. 2004. Albatrosses and Petrels Across the World. Oxford University Press, Oxford.
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
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. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.
Turbott, E.G. 1990. Checklist of the Birds of New Zealand. Ornithological Society of New Zealand, Wellington.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2018 Near Threatened B2b(iv); D2
2016 Near Threatened A2e+3e+4e; B2ab(iv); D2
2013 Near Threatened A2e+3e+4e; B2ab(iv); D2
2012 Near Threatened A2e+3e+4e;B2ab(iv);D2
2010 Near Threatened A2e; A3e; A4e; B2a+b(iv); D2
2008 Near Threatened B2a+b(iv); D2
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status full migrant Forest dependency Does not normally occur in forest
Land mass type Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 175,000,000 medium
Extent of Occurrence breeding/resident (km2) 912
Number of locations 11-20 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals medium estimated 2004
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations - - -
Percentage in largest subpopulation 100 - - -
Generation length (yrs) 15.6 - - -

Population justification: Brooke (2004) estimated that the population was likely greater than 1,500,000 individuals.

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


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
American Samoa U Extant
Antarctica N Extant Yes
Australia N Extant Yes
Canada N Extant Yes Yes
Chile U Extant
Cook Islands U Extant
Ecuador V Extant
Fiji N Extant Yes
French Polynesia U Extant
Japan V Extant
Kiribati U Extant
Marshall Islands N Extant Yes
Mexico U Extant
Micronesia, Federated States of U Extant
Nauru U Extant
New Caledonia (to France) U Extant
New Zealand N Extant Yes
Niue (to New Zealand) U Extant
Norfolk Island (to Australia) U Extant
Pitcairn Islands (to UK) U Extant
Russia V Extant
Russia (Asian) V Extant
Samoa U Extant
Solomon Islands U Extant
Tokelau (to New Zealand) U Extant
Tonga U Extant
Tuvalu U Extant
United States Minor Outlying Islands (to USA) U Extant
USA N Extant Yes Yes
Vanuatu U Extant
Wallis and Futuna Islands (to France) U Extant

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
New Zealand Fiordland - West Coast South Island (South) (offshore)
New Zealand The Snares and Western Chain
New Zealand Dusky Sound Wet Jacket Arm
New Zealand Repanga Cuvier island
New Zealand Whenua Hou Codfish Island
New Zealand Stewart Island / the rest
New Zealand Port Pegasus
New Zealand Southern Titi Muttonbird Islands
New Zealand Pacific, Southwest 29 - Marine
New Zealand Pacific, Southwest 30 - Marine
New Zealand Pacific, Southwest 37 - Marine
New Zealand Pacific, Southwest 38 - Marine
New Zealand Pacific, Southwest 39 - Marine
New Zealand Pacific, Southwest 46 - Marine
New Zealand Pacific, Southwest 47 - Marine
Fiji East Kadavu Passage
New Zealand Codfish Island/Whenua Hou
New Zealand Southern Muttonbird (Titi) Islands
New Zealand Solander Islands
New Zealand Snares (eastern islands)
New Zealand Chalky Preservation Inlets
New Zealand Western Chain
New Zealand Rakiura (offshore)
New Zealand Snares (offshore)
New Zealand Southern South Island (offshore)

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Grassland Subantarctic major breeding
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands major breeding
Marine Neritic Macroalgal/Kelp suitable non-breeding
Marine Neritic Macroalgal/Kelp suitable breeding
Marine Neritic Pelagic major non-breeding
Marine Neritic Pelagic major breeding
Marine Neritic Seagrass (Submerged) suitable non-breeding
Marine Neritic Seagrass (Submerged) suitable breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel suitable non-breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel suitable breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable non-breeding
Marine Neritic Subtidal Rock and Rocky Reefs suitable breeding
Marine Neritic Subtidal Sandy suitable non-breeding
Marine Neritic Subtidal Sandy suitable breeding
Marine Neritic Subtidal Sandy-Mud suitable non-breeding
Marine Neritic Subtidal Sandy-Mud suitable breeding
Marine Oceanic Abyssopelagic (4000-6000m) suitable non-breeding
Marine Oceanic Bathypelagic (1000-4000m) suitable non-breeding
Marine Oceanic Epipelagic (0-200m) major non-breeding
Marine Oceanic Epipelagic (0-200m) major breeding
Marine Oceanic Mesopelagic (200-1000m) major non-breeding
Marine Oceanic Mesopelagic (200-1000m) major breeding
Altitude 0 - 350 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Hunting & trapping terrestrial animals - Unintentional effects (species is not the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Reduced reproductive success
Climate change & severe weather Temperature extremes Timing Scope Severity Impact
Ongoing Majority (50-90%) Causing/Could cause fluctuations Medium Impact: 6
Stresses
Indirect ecosystem effects, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Gallirallus australis Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Rattus rattus Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Reduced reproductive success

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food - human - - - Non-trivial Recent
Food - human - - Non-trivial Recent

Recommended citation
BirdLife International (2022) Species factsheet: Pterodroma inexpectata. Downloaded from http://www.birdlife.org on 29/01/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 29/01/2022.