VU
Yellow-bearded Greenbul Criniger olivaceus



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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - A2c+3c+4c

Red List history
Year Category Criteria
2018 Vulnerable A2c+3c+4c
2016 Vulnerable A2c+3c
2012 Vulnerable A2c+3c+4c
2008 Vulnerable A2c; A3c; A4c
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency Medium
Land mass type Land-mass type - continent
Average mass 28 g
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 373,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals unknown poor suspected 2007
Population trend Decreasing medium 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) 30-49 - - -
Decline (10 years/3 generation past and future) 30-49 - - -
Number of subpopulations 2-100 - - -
Largest subpopulations - - -
Generation length (yrs) 3.5 - - -

Population justification: The total population is conservatively suspected to number somewhere in the region of 100,000-499,999 individuals based on a population of c.120,000 pairs in Liberia alone (Gatter 1997).

Trend justification: The population is suspected to be declining rapidly, in line with the clearance of forest within the species' range for commercial timber extraction and agriculture.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Côte d'Ivoire N Extant Yes
Ghana N Extant Yes
Guinea N Extant Yes
Liberia N Extant Yes
Sierra Leone N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Côte d'Ivoire Mount Nimba Strict Nature Reserve
Côte d'Ivoire Mabi Forest reserve
Côte d'Ivoire Parc National de Taï et Réserve de faune du N'Zo
Côte d'Ivoire Mopri Forest Reserve
Côte d'Ivoire Yapo and Mambo Forest Reserves
Ghana Ankasa Resource Reserve - Nini-Sushien National Park
Ghana Atewa Range Forest Reserve
Ghana Bia National Park and Resource Reserve
Ghana Boin Tano Forest Reserve
Ghana Boin River Forest Reserve
Ghana Bura River Forest Reserve
Ghana Cape Three Points Forest Reserve
Ghana Dadieso Forest Reserve
Ghana Draw River Forest Reserve
Ghana Ebi River Shelterbelt Forest Reserve
Ghana Fure River Forest Reserve
Ghana Jema-Asemkrom Forest Reserve
Ghana Kakum National Park - Assin Attandaso Resource Reserve
Ghana Subri River Forest Reserve
Ghana Tano-Anwia Forest Reserve
Ghana Tano-Ehuro Forest Reserve
Ghana Tano-Nimiri Forest Reserve
Ghana Tano-Offin Forest Reserve
Guinea Massif du Ziama
Guinea Diécké
Liberia Wologizi mountains
Liberia Wonegizi mountains
Liberia Lofa-Gola-Mano Complex
Liberia Nimba mountains
Liberia Zwedru
Liberia Cestos - Senkwen
Liberia Sapo
Liberia Grebo
Sierra Leone Loma Mountains Non-hunting Forest Reserve
Sierra Leone Gola Forests
Ghana Boi-Tano
Guinea Pic de Fon
Ghana Apedwa Forest Reserve
Ghana Dissue River Forest Reserve
Ghana Ndumfiri Forest Reserve
Ghana Neung North Forest Reserve
Côte d'Ivoire Banco National Park
Côte d'Ivoire Sassandra-Dabgego Ramsar Site
Côte d'Ivoire Besso Classified Forest
Côte d'Ivoire Cavally and Goin - Debe Forest Reserves
Côte d'Ivoire Haute Dodo Classified Forest
Sierra Leone Gola Forest Reserve
Sierra Leone Kambui Hills and Extension
Sierra Leone Kangari Hills Non-hunting Forest Reserve
Sierra Leone Tiwai Island
Sierra Leone Kambui Hills Forest Reserve

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 800 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (large scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
Energy production & mining Mining & quarrying Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2020) Species factsheet: Criniger olivaceus. Downloaded from http://www.birdlife.org on 28/11/2020. Recommended citation for factsheets for more than one species: BirdLife International (2020) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/11/2020.