VU
New Britain Thicketbird Megalurulus grosvenori



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
- - D1

Red List history
Year Category Criteria
2016 Vulnerable D1
2012 Vulnerable D1
2008 Vulnerable D1
2004 Data Deficient
2000 Data Deficient
1996 Data Deficient
1994 Data Deficient
1988 Near Threatened
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) 8,500 medium
Extent of Occurrence breeding/resident (km2) 530 poor
Number of locations -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 250-999 poor suspected 2000
Population trend Decreasing poor estimated -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 4.7 - - -
Decline (10 years/3 generation past and future) 4.7 - - -
Number of subpopulations - - -
Largest subpopulations - - -
Generation length (yrs) 3.6 - - -

Population justification: There is no evidence for estimating the population size except for negative records from sites slightly lower than the species' single known historical location. The population size is provisionally placed in the band 250-999 mature individuals.

Trend justification:

Buchanan et al. (2008) calculated the rate of habitat loss within the range of this species as c.5% over three generations based on the rate of apparent habitat loss from remote sensing images, but this seems unlikely given its attitudinal range and needs ground-truthing. Less detailed analysis is available for later years but the overall rate of forest loss has slowed, with about 2.2% of forest was lost plus 5.2% degraded across New Britain (mostly in the lowlands) between 2002 and 2014 (Bryan and Shearman 2015). 


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 Montane major resident
Altitude 1700 - 1700 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Ecosystem degradation
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Stresses
Species mortality

Recommended citation
BirdLife International (2019) Species factsheet: Megalurulus grosvenori. Downloaded from http://www.birdlife.org on 15/11/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 15/11/2019.