Matsudaira's Storm-petrel Hydrobates matsudairae


Taxonomic note
Hydrobates matsudairae (del Hoyo and Collar 2014) was previously placed in the genus Oceanodroma.

Taxonomic source(s)
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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - D2

Red List history
Year Category Criteria
2018 Vulnerable D2
2016 Vulnerable D2
2014 Vulnerable D2
2012 Data Deficient
2010 Data Deficient
2008 Data Deficient
2004 Data Deficient
2000 Data Deficient
1996 Data Deficient
1994 Data Deficient
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) 270 medium
Extent of Occurrence non-breeding (km2) 42,800,000 medium
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals medium estimated 2004
Population trend Unknown -
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) 14.6 - - -

Population justification: It is described as not especially rare in the Indian Ocean, suggesting that the global population numbers a minimum of 20,000 individuals (Brooke 2004).

Trend justification: The population trend is difficult to determine because of uncertainty over the main threats to the species.

Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Australia V Extant
British Indian Ocean Territory U Extant
Christmas Island (to Australia) V Extant
Cocos (Keeling) Islands (to Australia) U Extant
Guam (to USA) N Extant Yes
Indonesia N Extant
Japan N Extant Yes
Kenya N Extant Yes
Maldives U Extant
Micronesia, Federated States of U Extant
Northern Mariana Islands (to USA) N Extant Yes
Palau N Extant Yes
Papua New Guinea U Extant
Philippines U Extant
Seychelles N Extant Yes
Somalia N Extant Yes
Tanzania U Extant
Timor-Leste U Extant

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Japan Kazan-retto islands
Japan Kazan-Retto Islands - Marine
Fiji East Kadavu Passage

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Coastal/Supratidal Sea Cliffs and Rocky Offshore Islands 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   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Rattus rattus Timing Scope Severity Impact
Ongoing Minority (<50%) Very Rapid Declines Medium Impact: 7
Reduced reproductive success, Species mortality

Recommended citation
BirdLife International (2020) Species factsheet: Hydrobates matsudairae. Downloaded from on 24/11/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from on 24/11/2020.