CR
Long-billed Forest-warbler Artisornis moreaui



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
C2a(ii) B1ab(i,ii,iii,iv,v); C2a(i,ii); D B1ab(i,ii,iii,iv,v); C2a(i,ii); D1+2

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

Migratory status not a migrant Forest dependency High
Land mass type Average mass 9.100000381 g
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 440 medium
Number of locations 2-5 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 50-249 medium estimated 2000
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) - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 2-100 - - -
Largest subpopulations 90-94 - - -
Generation length (yrs) 3.6 - - -

Population justification: Cordeiro (2000) estimated 150-200 in Amani Nature Reserve. The populations on Mount Nilo and the Njesi Plateau are unknown, but may be small, so the global estimate is placed precautionarily in the band 50-249 individuals. This equates to 33-166 mature individuals, rounded here to 30-200 mature individuals.

Trend justification: This species is suspected to be declining in parts of its range owing to strong pressures that are impacting unprotected forests in parts of the East Usambaras, and recent disturbance within protected areas such as Amani Nature Reserve. Therefore, we employ a negative population trend overall (though this may be slight). If further research confirms that the species's global population size is stable it may warrant downlisting in the future.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Tanzania 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 suitable resident
Forest Subtropical/Tropical Moist Montane major resident
Shrubland Subtropical/Tropical Moist suitable resident
Altitude 800 - 1250 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 Minority (<50%) Slow, Significant Declines Low Impact: 5
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%) Slow, Significant Declines Medium Impact: 6
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 - Maesopsis eminii Timing Scope Severity Impact
Ongoing Majority (50-90%) Unknown Unknown
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2019) Species factsheet: Artisornis moreaui. Downloaded from http://www.birdlife.org on 21/07/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 21/07/2019.