EN
Aceh Bulbul Pycnonotus snouckaerti



Taxonomy

Taxonomic note

Pycnonotus bimaculatus and P. snouckaerti (del Hoyo and Collar 2016) were previously lumped as P. bimaculatus following Sibley & Monroe (1990, 1993).

 

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
- C2a(ii) B1ab(v); C2a(i,ii); D1

Red List history
Year Category Criteria
2020 Endangered C2a(ii)
2016 Vulnerable C2a(ii)
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 16,300
Number of locations 2-5 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 250-999 poor suspected 2020
Population trend Decreasing 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) 11-20 - - -
Decline (10 years/3 generation past and future) 11-20 - - -
Number of subpopulations 1 - - -
Percentage in largest subpopulation 100 - - -
Generation length (yrs) 3.5 - - -

Population justification: Given the species's restricted range throughout the Gunung Leuser National Park only, but with its true range likely confided to 1-3 sites (F. Rheindt in litt. 2020, J. Eaton in litt. 2020), it has been estimated that there may only be more than 250 mature individuals left (F. Rheindt in litt. 2020). Thus, the population size is placed here in the band of 250-999 mature individuals, roughly converted to 375-1,500 individuals.

Trend justification: The population is inferred to be undergoing a continued decline at a moderate rate given the observation of trapping for the cage bird trade at locations for the species and observations of disappearance of the species from one of very few currently known locations (Eaton and Collar 2015).


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Indonesia Gunung Leuser

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable resident
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Forest Subtropical/Tropical Moist Lowland suitable resident
Forest Subtropical/Tropical Moist Montane major resident
Shrubland Subtropical/Tropical High Altitude suitable resident
Shrubland Subtropical/Tropical Moist suitable resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species disturbance, Species mortality

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Pets/display animals, horticulture - - International Non-trivial Recent

Recommended citation
BirdLife International (2021) Species factsheet: Pycnonotus snouckaerti. Downloaded from http://www.birdlife.org on 29/11/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 29/11/2021.