EN
Silver Oriole Oriolus mellianus



Taxonomy

Taxonomic note

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.
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- C2a(ii) C2a(i,ii)

Red List history
Year Category Criteria
2016 Endangered C2a(ii)
2013 Endangered C2a(ii)
2012 Vulnerable C2a(ii)
2010 Vulnerable C2a(ii)
2008 Vulnerable C2a(ii)
2007 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status full migrant Forest dependency High
Land mass type Land-mass type - continent
Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 236,000 medium
Extent of Occurrence non-breeding (km2) 77,000 medium
Number of locations 11-100 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 1000-2499 poor estimated 2013
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) 10-19 - - -
Decline (10 years/3 generation past and future) 10-19 - - -
Number of subpopulations 1 - - -
Percentage in largest subpopulation 100 - - -
Generation length (yrs) 3.7 - - -

Population justification: The population was previously estimated to number 2,500-9,999 mature individuals, based on an assessment of known records, descriptions of abundance and range size. However, the scarcity of the species has prompted this to be revised downwards to 1,000-2,499 mature individuals, equivalent to a total population of c.1,500-3,800 individuals.

Trend justification: The species is suspected to be declining at a moderate rate owing to forest clearance and degradation in its breeding grounds. Much remaining forest in the breeding strongholds of Sichuan, China, was earmarked as forest concessions for clearance in the next 20-25 years; however, a ban on logging in this area may prevent this rapid increase in logging pressure within the species's range.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Cambodia N Extant Yes
China (mainland) N Extant Yes
Thailand N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
China (mainland) Dazhubao and Dafengding
China (mainland) Maolan Nature Reserve
China (mainland) Huping Shan Nature Reserve
China (mainland) Maozi Feng
China (mainland) Babao Shan Nature Reserve
China (mainland) Longlin-Xilin
China (mainland) Dayao Shan Nature Reserve
China (mainland) Damingshan
China (mainland) Shiwandashan
Thailand Doi Inthanon
Thailand Mae Fang
Thailand Mae Yom
Thailand Khao Yai
Thailand Thung Yai - Naresuan
Thailand Huai Kha Khaeng
Thailand Kaeng Krachan
Thailand Khao Ang Ru Nai
Thailand Khao Soi Dao
China (mainland) Longhushan
China (mainland) Mamize Nature Reserve
China (mainland) Mao'er Shan Nature Reserve
China (mainland) Nanling mountains
China (mainland) Jueluohuo
China (mainland) Leimaping
China (mainland) Mabiandafengding Nature Reserve
China (mainland) Mahu
China (mainland) Xianjiapu
China (mainland) Zuantianpo

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland suitable breeding
Forest Subtropical/Tropical Moist Lowland suitable non-breeding
Forest Subtropical/Tropical Moist Montane major breeding
Forest Subtropical/Tropical Moist Montane major non-breeding
Altitude 600 - 1700 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 Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Species mortality
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Natural system modifications Fire & fire suppression - Increase in fire frequency/intensity Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2022) Species factsheet: Oriolus mellianus. Downloaded from http://www.birdlife.org on 01/12/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 01/12/2022.