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

Taxonomic note

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.
Ryan, P. G. 2008. Taxonomic and conservation implications of ecological speciation in Nesospiza buntings at Tristan da Cunha. Bird Conservation International 18(1): 20-29.
Ryan, P. G. 2008. Taxonomic and conservation implications of ecological speciation in Nesospiza buntings at Tristan da Cunha. Bird Conservation International 18(1): 20-29.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	D2

Red List history

Year	Category	Criteria
2016	Vulnerable	D2
2012	Vulnerable	D2
2010	Vulnerable	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)	19 km2	good
Number of locations	1	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	23400 mature individuals	good	estimated	2007
Population trend	stable	poor	suspected	2000-2010
Generation length	3.8 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The species is abundant on Inaccessible Island, especially in coastal tussock, with the total population estimated at 23,400 mature individuals comprising three distinctive colour morphs and a large number of 'hybrids' between these morphs (Ryan 2008). 

Trend justification: The species's population is suspected to be stable owing to the absence of any serious and immediate threats.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
St Helena (to UK)	extant	native	yes

Country/Territory	IBA Name
St Helena (to UK)	Inaccessible Island

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Grassland	Subantarctic	major	resident
Shrubland	Temperate	major	resident
Altitude	0 - 600 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Very Rapid Declines		Medium Impact: 7
		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		Whole (>90%)		Very Rapid Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Phormium tenax	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Unspecified species	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Inaccessible Island Finch Nesospiza acunhae. Downloaded from https://datazone.birdlife.org/species/factsheet/inaccessible-island-finch-nesospiza-acunhae on 22/12/2024.
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 22/12/2024.