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

Taxonomic note

Myiothlypis basilica (del Hoyo and Collar 2016) was previously placed in the genus Basileuterus and listed as B. basilicus following SACC (2005 & updates); Sibley & Monroe (1990, 1993); Stotz et al. (1996).

 

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.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2021	Near Threatened	D1
2016	Vulnerable	B1ab(i,ii,iii)
2012	Vulnerable	B1ab(i,ii,iii)
2008	Vulnerable	B1a+b(i,ii,iii)
2006	Vulnerable
2004	Vulnerable
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	1,898 km2	medium
Area of Occupancy (breeding/resident)	1,072 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	1000-3000 mature individuals	poor	suspected	2021
Population trend	stable	poor	suspected	1998-2008
Generation length	2.55 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population size has not been quantified directly. To account for its apparent rarity, it has been suggested to occur at a density of 5-10 individuals/km² derived on density estimates of congeners (M. nigrocristata and Basileuterus melanogenys; Renjifo et al. 2016), though the species may be rarer than this (E. Botero-Delgadillo in litt. 2021). Based on an area of habitat of 462 km², the population is suspected to number up to 2,300-4,600 individuals (Renjifo et al. 2016). This roughly equates to up to 1,500-3,000 mature individuals and to account for its rarity the population is here placed in the band 1,000-3,000 mature individuals.
The subpopulation structure has not been assessed, but based on its tolerance of converted habitats it is tentatively assumed that all individuals belong to the same subpopulation.

Trend justification: Tree cover loss has been negligible within the range (<1% over the past ten years; Global Forest Watch 2020). Moreover, the species is also found in second growth and appears to tolerate habitat loss and degradation (Renjifo et al. 2016; Curson 2020). Tentatively the population is assessed as stable.

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

Country/Territory	IBA Name
Colombia	Cuchilla de San Lorenzo
Colombia	Valle del Río Frío

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Shrubland	Subtropical/Tropical High Altitude	major	resident
Altitude	2300 - 3000 m	Occasional altitudinal limits	(min) 2100 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Agro-industry farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Scale Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Wood & pulp plantations - Agro-industry plantations	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation
Natural system modifications	Fire & fire suppression - Trend Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Santa Marta Warbler Myiothlypis basilica. Downloaded from https://datazone.birdlife.org/species/factsheet/santa-marta-warbler-myiothlypis-basilica 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.