LC
Viridian Dacnis Dacnis viguieri



Taxonomy

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: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.

IUCN Red list criteria met and history
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
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 24,400 medium
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 10000-19999 poor suspected 2018
Population trend Decreasing poor inferred -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 1-19 - - -
Decline (10 years/3 generation past and future) 1-19 - - -
Number of subpopulations - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 3.7 - - -

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 distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Colombia N Extant Yes
Panama N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Colombia Capurganá
Panama Darién National Park
Colombia Paramillo Natural National Park

Habitats & altitude
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  

Threats & impact
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

Recommended citation
BirdLife International (2022) Species factsheet: Dacnis viguieri. Downloaded from http://www.birdlife.org on 09/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 09/12/2022.