EN
Usambara Hyliota Hyliota usambara



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.
Erard, C.; Fry, C. H.; Grimes, L. G.; Irwin, M. P. S.; Keith, S.; Lack, P. C.; Pearson, D. J.; Tye, A. 1997. Sylviidae, Old World warblers. In: Urban, E.K.; Fry, C.H.; Keith, S. (ed.), The birds of Africa v. 5, pp. 57-431. Academic Press, San Diego, London.
Erard, C.; Fry, C. H.; Grimes, L. G.; Irwin, M. P. S.; Keith, S.; Lack, P. C.; Pearson, D. J.; Tye, A. 1997. Sylviidae, Old World warblers. In: Urban, E.K.; Fry, C.H.; Keith, S. (ed.), The birds of Africa v. 5, pp. 57-431. Academic Press, San Diego, London.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- B2ab(i,ii,iii,v) B1ab(i,ii,iii,v)+2ab(i,ii,iii,v); C2a(i); D1

Red List history
Year Category Criteria
2016 Endangered B2ab(i,ii,iii,v)
2012 Endangered B2ab(i,ii,iii,v)
2008 Endangered B2a+b(i,ii,iii,v)
2004 Endangered
2000 Endangered
1994 Not Recognised
1988 Not Recognised
Species attributes

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

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 640 medium
Extent of Occurrence breeding/resident (km2) 410 poor
Number of locations 2-5 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 600-1700 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) 10-19 - - -
Decline (10 years/3 generation past and future) - - -
Number of subpopulations 2-100 - - -
Largest subpopulations - - -
Generation length (yrs) 3.6 - - -

Population justification: The population is estimated to number 1,000-2,499 individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 667-1,666 mature individuals, rounded here to 600-1,700 mature individuals.

Trend justification: The species is suspected to be declining at a moderate rate, owing to small-scale logging and clearance for agriculture.


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
Artificial/Terrestrial Plantations suitable resident
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 300 - 1200 m 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 Majority (50-90%) Slow, Significant Declines
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2019) Species factsheet: Hyliota usambara. Downloaded from http://www.birdlife.org on 21/08/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 21/08/2019.