• 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
C2a(i,ii)	C2a(i,ii); D	C2a(i,ii); D1+2

Red List history

Year	Category	Criteria
2018	Critically Endangered	C2a(i,ii)
2016	Critically Endangered	C2a(i,ii)
2015	Critically Endangered	C2a(ii)
2013	Critically Endangered	C2a(ii)
2012	Critically Endangered	C2a(ii)
2010	Critically Endangered	C2a(ii)
2009	Critically Endangered	C2a(ii)
2008	Critically Endangered
2004	Critically Endangered
2000	Critically Endangered
1996	Critically Endangered
1994	Critically Endangered
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	770,000 km2	medium
Extent of Occurrence (non-breeding)	121,000 km2	medium
Number of locations	1	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	50-249 mature individuals	poor	estimated	2008
Population trend	decreasing	poor	suspected	1965-2010
Generation length	17.7 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification:

The population is assumed to be very small, with the species only definitely known from two specimens taken in 1928 and 1929 until its rediscovery in 2007. The largest single record since its rediscovery was a minimum count of 300 individuals in Silur Bay, April 2016 (J. Bird in litt. 2016). It is placed in the band 50-249 mature individuals here, equivalent to 75-374 individuals in total, rounded here to 70-400 individuals.

Trend justification: It may have declined severely from depredation by introduced cats and rats on its breeding grounds (which are unknown but probably include, or are restricted to, New Ireland). However, the rate of decline has not been estimated.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
American Samoa	presence uncertain	uncertain
Australia	presence uncertain	uncertain
Fiji	presence uncertain	uncertain
Micronesia, Federated States of	presence uncertain	uncertain
Nauru	presence uncertain	uncertain
New Caledonia (to France)	presence uncertain	uncertain
Niue (to New Zealand)	presence uncertain	uncertain
Norfolk Island (to Australia)	presence uncertain	uncertain
Papua New Guinea	extant	native		yes
Samoa	presence uncertain	uncertain
Solomon Islands	extant	native		yes
Tokelau (to New Zealand)	presence uncertain	uncertain
Tonga	presence uncertain	uncertain
Tuvalu	presence uncertain	uncertain
Vanuatu	extant	uncertain
Wallis and Futuna Islands (to France)	extant	uncertain

Country/Territory	IBA Name
Papua New Guinea	Bismarck Sea
Papua New Guinea	Southern New Ireland Marine

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	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	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		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Ecosystem degradation, Ecosystem conversion
Energy production & mining	Mining & quarrying	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Named species	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Sus domesticus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Ecosystem degradation, Species mortality

---

Recommended citation
BirdLife International (2024) Species factsheet: Beck's Petrel Pseudobulweria becki. Downloaded from https://datazone.birdlife.org/species/factsheet/becks-petrel-pseudobulweria-becki 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.