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

Taxonomic note
Oceanodroma castro (Sibley and Monroe 1990, 1993) has been split into O. castro and O. monteiroi following Bolton et al. (2008). All Oceanodroma species have since been moved to Hydrobates (del Hoyo and Collar 2014).

Taxonomic source(s)
Bolton, M.; Smith, A. L.; Gómez-Díaz, E.; Friesen, V. L.; Medeiros, R.; Bried, J.; Roscales, J. L.; Furness, R. W. 2008. Monteiro's Storm Petrel Oceanodroma monteiroi: a new species from the Azores. Ibis 150(4): 717-727.
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
-	-	D1+2

Red List history

Year	Category	Criteria
2018	Vulnerable	D1+2
2016	Vulnerable	D1+2
2013	Vulnerable	D1+2
2012	Vulnerable	D1+2
2010	Vulnerable	D1; D2
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	not a migrant	Forest dependency	does not normally occur in forest
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	739,000 km2
Area of Occupancy (breeding/resident)	1 km2	medium
Number of locations	4	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	250-999 mature individuals	medium	estimated	1999
Population trend	stable	poor	suspected	1953-2010
Rate of change over the past 10 years/3 generations (longer of the two periods)	0%	-	-	-
Generation length	16.5 years	-	-	-

Population justification: The population was estimated at 300 pairs in 1999 (Bolton et al. 2008). Recently, the Praia islet population size was updated to 178 breeding pairs, resulting in a global population size estimated at 328-378 pairs (Oliveira et al. 2016). Although the estimate for the population other than Praia islet is now a decade old, the population is not thought to have declined since. The Praia population increased in response to the installation of artificial nest boxes. Thus, the population is best placed in the band 250-999 mature individuals. This equates to 375-1,499 individuals in total, rounded here to 350-1,500 individuals.

Trend justification: Although there is no trend data, the population is suspected to be stable. The population may have even increased since the last known population estimate in 1999 owing to an increase in annual productivity following the installation of nest boxes (Bolton et al. 2008, Bried et al. 2009).

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Portugal	extant	native		yes	yes

Country/Territory	IBA Name
Portugal	Graciosa

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Marine Coastal/Supratidal	Sea Cliffs and Rocky Offshore Islands	major	breeding
Marine Neritic	Pelagic	major	breeding
Marine Neritic	Pelagic	major	non-breeding
Marine Oceanic	Epipelagic (0-200m)	major	non-breeding
Marine Oceanic	Epipelagic (0-200m)	major	breeding
Rocky areas (eg. inland cliffs, mountain peaks)		major	breeding
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Majority (50-90%)		Rapid Declines		Past Impact
		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
		Future		Majority (50-90%)		Rapid Declines		Low Impact: 5
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Teira dugesii	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Reduced reproductive success
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Asio otus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Calonectris borealis	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Competition, Reduced reproductive success
Pollution	Excess energy - Light pollution	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Reduced reproductive success, Species mortality
Residential & commercial development	Tourism & recreation areas	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Species disturbance, Ecosystem degradation, Reduced reproductive success
Transportation & service corridors	Shipping lanes	Timing		Scope		Severity		Impact
		Future		Majority (50-90%)		Unknown		Unknown
		Stresses Ecosystem degradation, Reduced reproductive success, Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Monteiro's Storm-petrel Hydrobates monteiroi. Downloaded from https://datazone.birdlife.org/species/factsheet/monteiros-storm-petrel-hydrobates-monteiroi 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.