• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

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

Migratory status	not a migrant	Forest dependency	medium
Land-mass type	continent	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	640 km2	medium
Area of Occupancy (breeding/resident)	410 km2	poor
Number of locations	2-5	-
Severely fragmented?	yes	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	600-1700 mature individuals	medium	estimated	2000
Population trend	decreasing	poor	suspected	-
Rate of change over the past 10 years/3 generations (longer of the two periods)	10-19%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	10-19%	-	-	-
Generation length	3.6 years	-	-	-
Number of subpopulations	2-100	-	-	-

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	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Tanzania	extant	native	yes

Country/Territory	IBA Name

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

Threat (level 1)	Threat (level 2)	Impact and Stresses
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	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Rapid Declines		Medium Impact: 6
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Usambara Hyliota Hyliota usambara. Downloaded from https://datazone.birdlife.org/species/factsheet/usambara-hyliota-hyliota-usambara on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.