CR
Beck's Petrel Pseudobulweria becki



Taxonomy

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.

IUCN Red List criteria met and history
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
Species attributes

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

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 -
Population
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 distribution
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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Papua New Guinea Bismarck Sea
Papua New Guinea Southern New Ireland Marine

Habitats & altitude
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  

Threats & impact
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: Pseudobulweria becki. Downloaded from https://datazone.birdlife.org/species/factsheet/becks-petrel-pseudobulweria-becki on 01/03/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org on 01/03/2024.