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

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	A3bc	A3bc; C1+2a(i)

Red List history

Year	Category	Criteria
2018	Endangered	A3bc
2016	Vulnerable	B1ab(i,ii,iii,v); C2a(i)
2012	Vulnerable	B1ab(i,ii,iii,v);C2a(i)
2008	Vulnerable	B1a+b(i,ii,iii,v); C2a(i)
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Near Threatened

Migratory status	not a migrant	Forest dependency	high
Land-mass type	shelf island	Average mass	52 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	48,900 km2	medium
Number of locations	11-100	-
Severely fragmented?	yes	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	poor	estimated	1999
Population trend	decreasing	medium	suspected	1998-2008
Rate of change over the future 10 years/3 generations (longer of the two periods)	50-79%	-	-	-
Generation length	7.1 years	-	-	-
Number of subpopulations	2-100	-	-	-

Population justification: The population is estimated to number 2,500-9,999 mature individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals.

Trend justification: The population is suspected to be in decline owing to the clearance and degradation of forest within its range. Modelling the possible effects of climate change have shown that this species's ecological niche may completely disappear by 2050 (Andriamasimanana and Cameron 2013). Depending on when climate change begins to noticeably impact the species's habitat, this could equate to a decline in its ecological niche in the range of 50-79% over its next 3 generations (c.21 years).

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

Country/Territory	IBA Name
Madagascar	Ambatovaky Special Reserve
Madagascar	Anjanaharibe Classified Forest
Madagascar	Betampona Strict Nature Reserve
Madagascar	Bezavona Classified Forest
Madagascar	Mangerivola Special Reserve
Madagascar	Marojejy National Park
Madagascar	Masoala National Park
Madagascar	Sihanaka Forest
Madagascar	South Anjanaharibe Special Reserve and extension
Madagascar	Upper Rantabe Classified Forest
Madagascar	Zahamena National Park and Strict Reserve

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Altitude	0 - 900 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Shifting agriculture	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Rapid Declines		Medium Impact: 6
		Stresses Indirect ecosystem effects, Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Bernier's Vanga Oriolia bernieri. Downloaded from https://datazone.birdlife.org/species/factsheet/berniers-vanga-oriolia-bernieri 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.