• 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
2019	Least Concern
2018	Near Threatened	B1ab(ii,iii)
2016	Near Threatened	B1ab(ii,iii)
2012	Near Threatened	B1ab(ii,iii)
2011	Near Threatened	B1a+b(ii,iii)
2008	Near Threatened	B1a+b(i,ii,iii,v)
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Near Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	24,400 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	10000-19999 mature individuals	poor	suspected	2018
Population trend	decreasing	poor	inferred	2009-2020
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-19%	-	-	-
Generation length	3.7 years	-	-	-

Population justification: The species’s population size has not previously been estimated and no survey data are available, but it has been described as ‘rare’. Based on the estimated area of forest with at least 30% canopy cover in the species’s mapped range in 2018 (14,000 km²), the recorded population densities of a closely-related species with a similar ecology (Dacnis cayana: 0.7 individuals/km² in lowland rainforest in southern Guyana [Thiollay 1986], 12 individuals/km² in rainforest in Peru [Munn 1995]), and assuming that 22-45% of suitable habitat is occupied, the species’s population size is suspected to fall within the range 4,412 – 75,636 individuals, roughly equivalent to 2,941-50,424 mature individuals. Whilst the species is described as rare, the species has been recorded over a wide area and it could be fairly cryptic and overlooked. Additionally, the lower bound of habitat occupancy (22% of forest within its range) could be unduly conservative, given that large parts of the species’s range contain reasonably intact forest. It is therefore considered unlikely that the true population size falls below or approaches the threshold of 10,000 mature individuals, so it is here placed in the band 10,000-19,999 mature individuals.

Trend justification: Data on trends are lacking, but slow to moderate declines are likely to be occurring, owing to habitat loss within parts of the range. An analysis of forest loss from 2000 to 2012 found that forest within the species’s range was lost at a rate equivalent to 2% over three generation lengths (Tracewski et al. 2016). Assuming the population has declined at the same rate as the forest cover, the species is suspected to have undergone a reduction of 2% over the past three generation lengths, and assuming that forest loss continues at a similar rate, the population may be assumed to continue to decline at this rate in future.

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

Country/Territory	IBA Name
Colombia	Capurganá
Panama	Darién National Park

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Shrubland	Subtropical/Tropical Dry	marginal	resident
Altitude	0 - 700 m	Occasional altitudinal limits

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%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture	Livestock farming & ranching - Agro-industry grazing, ranching or farming	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Transportation & service corridors	Roads & railroads	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Viridian Dacnis Dacnis viguieri. Downloaded from https://datazone.birdlife.org/species/factsheet/viridian-dacnis-dacnis-viguieri on 22/11/2024.
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 22/11/2024.