LC
Wedge-tailed Shearwater Ardenna pacifica



Taxonomy

Taxonomic note
Ardenna pacifica (del Hoyo and Collar 2014) was previously placed in the genus Puffinus as P. pacificus.

Taxonomic source(s)
AERC TAC. 2003. AERC TAC Checklist of bird taxa occurring in Western Palearctic region, 15th Draft. Available at: #http://www.aerc.eu/DOCS/Bird_taxa_of _the_WP15.xls#.
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 Least Concern
2016 Least Concern
2012 Least Concern
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
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 -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 160,000,000
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals poor estimated 2004
Population trend Decreasing 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 - - -
Largest subpopulations - - -
Generation length (yrs) 16.5 - - -

Population justification: Brooke (2004) estimated the global population to number >5,200,000 individuals, while national population sizes have been estimated at c.50-10,000 individuals on migration in Taiwan and c.10,000-100,000 breeding pairs and c.1,000-10,000 individuals on migration in Japan (Brazil 2009).

Trend justification: The population is suspected to be in decline owing to unsustainable levels of exploitation, persecution, predation by invasive species and the over-exploitation of tuna fisheries (Brooke 2004).


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
American Samoa U Extant
Australia N Extant
British Indian Ocean Territory N Extant Yes
Chile U Extant
China (mainland) N Extant
Christmas Island (to Australia) V Extant
Cocos (Keeling) Islands (to Australia) N Extant Yes
Colombia N Extant
Comoros U Extant
Cook Islands U Extant
Costa Rica V Extant Yes
Ecuador N Extant
Egypt V Extant
El Salvador U Extant
Fiji N Extant Yes
French Polynesia N Extant Yes
French Southern Territories U Extant
Guam (to USA) N Extant Yes
Guatemala N Extant
Honduras N Extant
India N Extant
Indonesia N Extant
Iran, Islamic Republic of V Extant Yes
Japan N Extant
Kenya N Extant
Kiribati N Extant Yes
Madagascar N Extant
Malaysia N Extant
Maldives N Extant
Marshall Islands N Extant Yes
Mauritius N Extant Yes
Mayotte (to France) U Extant
Mexico N Extant
Micronesia, Federated States of N Extant Yes
Mozambique N Extant
Nauru U Extant
New Caledonia (to France) N Extant
New Zealand V Extant
Nicaragua N Extant
Niue (to New Zealand) U Extant
Norfolk Island (to Australia) N Extant
Northern Mariana Islands (to USA) N Extant Yes
Oman N Extant Yes
Pakistan U Extant
Palau N Extant Yes
Panama V Extant
Papua New Guinea N Extant
Peru U Extant
Philippines N Extant
Pitcairn Islands (to UK) U Extant
Réunion (to France) N Extant
Samoa N Extant Yes
Seychelles N Extant Yes
Solomon Islands N Extant Yes
Somalia N Extant
South Africa U Extant
Sri Lanka N Extant
Taiwan, China N Extant
Tanzania U Extant
Tokelau (to New Zealand) U Extant
Tonga N Extant
Tuvalu U Extant
United States Minor Outlying Islands (to USA) N Extant Yes
USA N Extant Yes
Vanuatu N Extant
Wallis and Futuna Islands (to France) U Extant
Yemen N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Australia Capricornia Cays
Australia Coringa-Herald Reefs
Australia Houtman Abrolhos
Australia Lord Howe Island Permanent Park Preserve (Lord Howe Island IBA)
Mauritius Round Island
New Caledonia (to France) Île Kotomo
New Caledonia (to France) Îlot M’ba
New Caledonia (to France) Îlot Signal
New Caledonia (to France) Récifs Bampton et Chesterfield Marin
New Zealand Macauley & Haszard Islands
Norfolk Island (to Australia) Norfolk Island
Norfolk Island (to Australia) Norfolk Island / Phillip Island - Marine
Seychelles Aride Island Special Reserve
Seychelles Cousin Island Special Reserve
Seychelles Cousine island
Tonga 'Ata Island
Tonga Ata Island Marine
USA Kilauea Point National Wildlife Refuge
USA Lehua Islet
USA Lehua Islet
USA Northwestern Hawaiian Islands
Vanuatu Tongoa - Laika

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands suitable breeding
Marine Neritic Macroalgal/Kelp major non-breeding
Marine Neritic Macroalgal/Kelp major breeding
Marine Neritic Pelagic major non-breeding
Marine Neritic Pelagic major breeding
Marine Neritic Seagrass (Submerged) major non-breeding
Marine Neritic Seagrass (Submerged) major breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel major non-breeding
Marine Neritic Subtidal Loose Rock/pebble/gravel major breeding
Marine Neritic Subtidal Rock and Rocky Reefs major non-breeding
Marine Neritic Subtidal Rock and Rocky Reefs major breeding
Marine Neritic Subtidal Sandy major non-breeding
Marine Neritic Subtidal Sandy major breeding
Marine Neritic Subtidal Sandy-Mud major non-breeding
Marine Neritic Subtidal Sandy-Mud major 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 - 100 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Fishing & harvesting aquatic resources - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Competition
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Reduced reproductive success
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species disturbance, Reduced reproductive success
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Felis catus Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Reduced reproductive success, Species mortality
Pollution Garbage & solid waste Timing Scope Severity Impact
Ongoing Whole (>90%) Unknown Unknown
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 (2019) Species factsheet: Ardenna pacifica. Downloaded from http://www.birdlife.org on 26/03/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 26/03/2019.