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

Taxonomic note
Aphrastura masafuerae (Handbook of the Birds of the World and BirdLife International 2021) was previously listed as Aphrastura masafucrae (del Hoyo and Collar 2016). The latter spelling was subject to a later attempt to correct the name by the author of the type description, and has been recognised as an accidental error: the type description had intended to use the name of the island on which the species occurs in the original description.

Taxonomic source(s)
Handbook of the Birds of the World and BirdLife International. 2021. Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 6. Available at: https://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v6_Dec21.zip.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
B1ab(iii)	B1ab(iii)+2ab(iii); D	B1ab(iii)+2ab(iii); D1+2

Red List history

Year	Category	Criteria
2023	Critically Endangered	B1ab(iii)
2016	Critically Endangered	B1ab(iii)
2015	Critically Endangered	B1ab(iii)
2012	Critically Endangered	B1ab(iii)
2010	Critically Endangered	B1a+b(iii,v)
2009	Critically Endangered	B1a+b(iii,v)
2008	Critically Endangered
2005	Critically Endangered
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Threatened

Migratory status	not a migrant	Forest dependency	medium
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	36 km2	medium
Area of Occupancy (breeding/resident)	36 km2
Number of locations	1	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	90-330 mature individuals	medium	estimated	2011
Population trend	stable	medium	suspected	2000-2010
Generation length	2.27 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population was estimated at c. 500 individuals in the mid-1980s (Brooke 1988). Surveys in 2002 and 2011 placed  the population at c.140 individuals (I. Hahn, P. Hodum and M. Wainstein in litt. 2003, Hahn et al. 2006, I. Hahn in litt. 2012). However, surveys using a different methodology during 2006-2007 estimated a population similar to the c. 500 individuals counted 20 years previously (Tomasevic et al. 2010). As there is currently no evidence of declines or increases, the population is here tentatively placed in the band 140-500 individuals, which roughly equates to 90-330 mature individuals. An exact quantification of the current population is however urgently required.

Trend justification: The species underwent a rapid decline between the mid-1980s and early 2000s, but seems to have stabilised at around 140-500 individuals since.

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

Country/Territory	IBA Name
Chile	Isla Alejandro Selkirk (Parque Nacional Archipiélago de Juan Fernández, Isla Alejandro Selkirk IBA)

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Temperate	major	resident
Shrubland	Subtropical/Tropical Moist	major	resident
Wetlands (inland)	Permanent Rivers/Streams/Creeks (includes waterfalls)	suitable	resident
Altitude	600 - 1320 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 - Aristotelia chilensis	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Capra hircus	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 - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Mus musculus	Timing		Scope		Severity		Impact
		Unknown		Minority (<50%)		Unknown		Unknown
		Stresses Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus norvegicus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus rattus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rubus ulmifolius	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Ugni molinae	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Problematic native species/diseases - Geranoaetus polyosoma	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Masafuera Rayadito Aphrastura masafuerae. Downloaded from https://datazone.birdlife.org/species/factsheet/masafuera-rayadito-aphrastura-masafuerae on 23/12/2024.
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 23/12/2024.