CR
Niceforo's Wren Thryophilus nicefori



Taxonomy

Taxonomic note
Thryophilus nicefori (del Hoyo and Collar 2016) was previously listed as Thryothorus nicefori.

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. 2006. A classification of the bird species of South America. Available at: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.html#.
SACC. 2006. 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
C2a(i); D C2a(i); D B1ab(iii,v); C2a(i); D1+2

Red List history
Year Category Criteria
2016 Critically Endangered C2a(i); D
2015 Critically Endangered C2a(i); D
2012 Critically Endangered C2a(i);D
2011 Critically Endangered C2a(i)
2010 Critically Endangered C2a(i)
2009 Critically Endangered C2a(ii); D1
2008 Critically Endangered
2004 Critically Endangered
2000 Critically Endangered
1996 Critically Endangered
1994 Critically Endangered
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type Land-mass type - continent
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 13,000 medium
Number of locations 10 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 30-200 good observed 2009
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 2-100 - - -
Largest subpopulations 1-89 - - -
Generation length (yrs) 3.9 - - -

Population justification: Surveys between 2004 and 2008 recorded 77 individuals. An approximate estimate based on these surveys and other records gives a total global population of 250 individuals (S. Valderrama in litt. 2010). However, until this is confirmed to be accurate, the population band of 50-249 individuals seems appropriate. This equates to 33-166 mature individuals, rounded here to 30-200 mature individuals.

Trend justification: The species is suspected to be in decline owing to the spread of agriculture near the type locality, and because of threats to its dry forest habitat, although the likely rate of decline has not been quantified.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Colombia Bosques Secos del Valle del Río Chicamocha
Colombia Soatá

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Shrubland Subtropical/Tropical Dry major resident
Altitude 800 - 2100 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops Timing Scope Severity Impact
Ongoing Whole (>90%) Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops Timing Scope Severity Impact
Ongoing Whole (>90%) Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching Timing Scope Severity Impact
Ongoing Whole (>90%) Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching Timing Scope Severity Impact
Ongoing Whole (>90%) Unknown
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines
Stresses
Ecosystem degradation
Natural system modifications Fire & fire suppression Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2018) Species factsheet: Thryophilus nicefori. Downloaded from http://www.birdlife.org on 11/12/2018. Recommended citation for factsheets for more than one species: BirdLife International (2018) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 11/12/2018.