NT
Ribbon-tailed Drongo Dicrurus megarhynchus



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
- - -

Red List history
Year Category Criteria
2016 Near Threatened B1ab(ii,iii)
2012 Near Threatened B1ab(ii,iii)
2009 Least Concern
2008 Least Concern
2004 Least Concern
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 19,200
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals not applicable suspected 2012
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) 10-29 - - -
Decline (10 years/3 generation past and future) 10-29 - - -
Number of subpopulations - - -
Largest subpopulations - - -

Population justification: The population is estimated to be 'in the hundreds of thousands' (G. Duston in litt. 2012), best placed in the band 100,000-499,999 individuals, based on density estimates and size of remaining suitable habitat.

Trend justification: A recently published analysis of forest loss in Papua New Guinea indicates that c.21% of forest cover was lost in New Ireland between 1972 and 2002 (Shearman et al. 2009). Of New Ireland’s total forest cover in 1972, c.32% had been degraded by 2002, leaving c.40% of remaining forest cover in a degraded state (Shearman et al. 2009). Thus there is evidence that the species’s habitat is being destroyed and degraded, leading to on-going declines in the species's range.


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

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

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane major resident
Altitude   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 Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2019) Species factsheet: Dicrurus megarhynchus. Downloaded from http://www.birdlife.org on 22/07/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 22/07/2019.