• 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.
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
2024	Least Concern
2016	Vulnerable	A2c+3c+4c;B1ab(i,ii,iii,iv,v)
2012	Vulnerable	A2c+3c+4c;B1ab(i,ii,iii,iv,v)
2008	Vulnerable	A2c; A3c; A4c; B1a+b(i,ii,iii,iv,v)
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	41,700 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	12000-20000 mature individuals	poor	suspected	2023
Population trend	decreasing	poor	inferred	2017-2027
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-9%	-	-	-
Generation length	3.08 years	-	-	-
Number of subpopulations	2-10	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The population size has not been quantified. Density has not been reported, but the congener S. ucayalae has been recorded at between 4.7 and 7.7 individuals per square kilometer in south-east Peru (Lloyd 2004). Based on the distribution of records and noting that the species is uncommon, if only 20% of the modelled area of suitable habitat (12,786 km² [M. Sanchez-Nivicela in litt. 2024]) is occupied, the population can be inferred to be between 12,000 and 19,700 mature individuals. This is in line with the assessment of the species' status in Ecuador, which judged the population to fall between 2,500-9,999 mature individuals (see Freile et al. 2019). Ecuador holds roughly 20% of the mapped global distribution, hence a crude scaling of this gives a suspected number of 12,500-49,999 mature individuals. Tentatively the species population is suspected to fall between 12,000-20,000 mature individuals.

Trend justification: This species is declining; while in the past it was described as fairly common to common, it is now considered uncommon and local (Jiggins et al. 1999, Schulenberg et al. 2007, Freile and Restall 2018). The Ecuadorian assessment also recognised that there was a continuing decline in mature individuals (Freile et al. 2019).
Declines are thought to be caused by habitat destruction. Within the range, tree cover is lost at a rate of 2% over ten years (Global Forest Watch 2023, using Hansen et al. [2013] data and methods disclosed therein). This value however does not account for the additional impacts of forest degradation and fragmentation. Considering this, rates of population declines are possibly higher than the rate of tree cover loss alone suggests. Tentatively, population declines are here placed in the band 1-9% over ten years, noting that the trend rate may vary locally.

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

Country/Territory	IBA Name
Ecuador	Alamor-Celica
Ecuador	Bosque Protector Jatumpamba-Jorupe
Ecuador	Cañón del río Catamayo
Ecuador	Catacocha
Ecuador	Cazaderos-Mangaurquillo
Ecuador	La Tagua
Ecuador	Reserva Comunal Bosque de Angashcola
Ecuador	Tambo Negro
Ecuador	Utuana-Bosque de Hanne
Peru	Alto Valle del Saña
Peru	Bosque de Cuyas
Peru	Chiñama
Peru	Laquipampa
Peru	Parque Nacional Cerros de Amotape
Peru	Suyo-La Tina

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Subtropical/Tropical Heavily Degraded Former Forest	suitable	resident
Forest	Subtropical/Tropical Dry	major	resident
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	400 - 2900 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Annual & perennial non-timber crops - Small-holder farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Small-holder grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant 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%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Rufous-necked Foliage-gleaner Syndactyla ruficollis. Downloaded from https://datazone.birdlife.org/species/factsheet/rufous-necked-foliage-gleaner-syndactyla-ruficollis 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.