• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
Brooke, M. de L. 2004. Albatrosses and Petrels Across the World. Oxford University Press, Oxford.
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: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.
Turbott, E.G. 1990. Checklist of the Birds of New Zealand. Ornithological Society of New Zealand, Wellington.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	D2

Red List history

Year	Category	Criteria
2019	Vulnerable	D2
2018	Vulnerable	D2
2016	Vulnerable	D2
2012	Vulnerable	D2
2010	Vulnerable	D2
2008	Vulnerable	D2
2006	Vulnerable
2004	Vulnerable
2000	Vulnerable
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

Migratory status	full migrant	Forest dependency	high
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	56,600,000 km2	medium
Area of Occupancy (breeding/resident)	13 km2	medium
Number of locations	1	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	262000 mature individuals	medium	estimated	1986
Population trend	decreasing	poor	suspected	1965-2010
Generation length	15.6 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: In 1986, the population was estimated at 131,000 pairs (Carboneras 1992), implying a world population in excess of 400,000 individuals. More recent estimates suggest that the population size may be lower (Hodum and Wainstein 2003, 2004).

Trend justification: The population is thought to be declining due to predation by introduced mammals.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Chile	extant	native		yes
French Polynesia	extant	native			yes
Guam (to USA)	extant	native			yes
Japan	extant	native			yes
Kiribati	extant	uncertain
Marshall Islands	extant	native			yes
Micronesia, Federated States of	extant	native			yes
New Zealand	extant	vagrant
Northern Mariana Islands (to USA)	extant	native			yes
United States Minor Outlying Islands (to USA)	extant	native			yes
USA	extant	native			yes

Country/Territory	IBA Name
Chile	Isla Alejandro Selkirk (Parque Nacional Archipiélago de Juan Fernández, Isla Alejandro Selkirk IBA)

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	major	breeding
Grassland	Subtropical/Tropical Dry	suitable	breeding
Marine Neritic	Pelagic	major	breeding
Marine Neritic	Pelagic	major	non-breeding
Marine Oceanic	Epipelagic (0-200m)	major	breeding
Marine Oceanic	Epipelagic (0-200m)	major	non-breeding
Altitude	700 - 1120 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation
Climate change & severe weather	Storms & flooding	Timing		Scope		Severity		Impact
		Past, Likely to Return		Minority (<50%)		Unknown		Past Impact
		Stresses Ecosystem degradation, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Bos taurus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Capra hircus	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Negligible declines		Medium Impact: 6
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Mus musculus	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Negligible declines		Medium Impact: 6
		Stresses Ecosystem degradation, Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus norvegicus	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Negligible declines		Medium Impact: 6
		Stresses Ecosystem degradation, Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus rattus	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Negligible declines		Medium Impact: 6
		Stresses Ecosystem degradation, Reduced reproductive success

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Recommended citation
BirdLife International (2024) Species factsheet: Stejneger's Petrel Pterodroma longirostris. Downloaded from https://datazone.birdlife.org/species/factsheet/stejnegers-petrel-pterodroma-longirostris on 23/11/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 23/11/2024.