• 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(ii)	B2ab(iii,v);C2a(i,ii);D	B2ab(iii,v);C2a(i,ii);D1+2

Red List history

Year	Category	Criteria
2018	Critically Endangered	C2a(ii)
2016	Critically Endangered	C2a(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
2007	Critically Endangered
2006	Critically Endangered
2004	Critically Endangered
2000	Critically Endangered
1996	Critically Endangered
1994	Critically Endangered
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	77,000 km2	poor
Area of Occupancy (breeding/resident)	9 km2	medium
Number of locations	4	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	100-200 mature individuals	medium	estimated	2004
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:

From their at-sea counts, Attie et al. (1997) suggest that the population may be around 1,000 individuals, implying 250 (45-400) breeding pairs, although 50-100 pairs was considered more likely (V. Bretagnolle in litt. 1999), i.e. 100-200 mature individuals.  However, recent estimates indicate that the breeding population may be just a few dozen pairs (Tatayah et al. 2011). The recent sighting of 33 different individuals in three days at sea south of La Réunion suggests that a more likely breeding population size is 100 pairs (Shirihai et al. 2014).

Trend justification: The species is believed to be declining owing to predation and light-induced mortality.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Mauritius	extinct	native	yes
Réunion (to France)	extant	native		yes

Country/Territory	IBA Name
Réunion (to France)	Grand Bassin - Le Dimitile

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
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
Shrubland	Subtropical/Tropical High Altitude	major	breeding
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Fishing & harvesting aquatic resources - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Species mortality
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Past, Unlikely to Return		Minority (<50%)		Slow, Significant Declines		Past Impact
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Herpestes auropunctatus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Rapid Declines		Medium Impact: 6
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus rattus	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Reduced reproductive success
Pollution	Excess energy - Light pollution	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Reduced reproductive success, Species mortality

Purpose	Scale
Food - human	subsistence, national

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Recommended citation
BirdLife International (2024) Species factsheet: Mascarene Petrel Pseudobulweria aterrima. Downloaded from https://datazone.birdlife.org/species/factsheet/mascarene-petrel-pseudobulweria-aterrima 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.