• 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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	B2ab(v)	B2ab(v); D2

Red List history

Year	Category	Criteria
2018	Endangered	B2ab(v)
2016	Endangered	B2ab(v)
2012	Endangered	B2ab(v)
2010	Endangered	B2a+b(v)
2008	Endangered	B2a+b(v)
2007	Endangered
2006	Endangered
2004	Endangered
2000	Endangered
1994	Not Recognised
1988	Not Recognised

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	9,820,000 km2	medium
Area of Occupancy (breeding/resident)	76 km2	medium
Number of locations	1-5	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	medium	estimated	2004
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 1991-1992, the breeding population on Henderson was estimated at c.16,000 breeding pairs, though using the incorrect island area. The revised estimate is 18,668 pairs (Oppel et al. 2017), and it was suggested that the species could be undergoing a long-term decline (Brooke 1995, Brooke et al. 2010). In 2015, the population was estimated to be 19,987 pairs (Oppel et al. 2017). 

Trend justification: High variability in breeding success suggests the population may be declining, but infrequent surveys (1991, 2015), which do not suggest any substantial change, make this difficult to confirm.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
French Polynesia	extant	uncertain		yes
Kiribati	extant	uncertain
Pitcairn Islands (to UK)	extant	native		yes

Country/Territory	IBA Name
Pitcairn Islands (to UK)	Henderson Island

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	breeding
Marine Neritic	Pelagic	major	non-breeding
Marine Neritic	Pelagic	major	breeding
Marine Oceanic	Epipelagic (0-200m)	major	non-breeding
Marine Oceanic	Epipelagic (0-200m)	major	breeding
Altitude	0 - 33 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
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus exulans	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Reduced reproductive success
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Named species	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Negligible declines		Medium Impact: 6
		Stresses Reduced reproductive success

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Recommended citation
BirdLife International (2024) Species factsheet: Henderson Petrel Pterodroma atrata. Downloaded from https://datazone.birdlife.org/species/factsheet/henderson-petrel-pterodroma-atrata on 22/11/2024.
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 22/11/2024.