Sassi's Olive Greenbul (Phyllastrephus lorenzi) | Details

Sassi's Olive Greenbul Phyllastrephus lorenzi

Current view: Data table and detailed info

Taxonomy

Taxonomic note
Phyllastrephus icterinus and P. lorenzi (del Hoyo and Collar 2016) were previously lumped as P. icterinus following Dowsett and Forbes-Watson (1993), Sibley and Monroe (1990, 1993) and Fishpool and Tobias (2005).

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
-	-	-

Red List history

Year	Category	Criteria
2024	Least Concern
2016	Least Concern
2012	Not Recognised
2008	Not Recognised
2004	Near Threatened
2000	Lower Risk/Near Threatened
1994	Lower Risk/Near Threatened
1988	Near Threatened

Species attributes

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

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	203,000 km²	medium
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	-
Generation length	3.69 years	-	-	-

Population justification: The global population size has not been quantified, but the species prior to its split from P. icterinus was described as generally common to abundant (del Hoyo et al. 2005), and it is found in several subpopulations. This species is considered to have a medium dependency on forest habitat, and tree cover is estimated to have declined by 10.5% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Therefore, as a precautionary measure, it is tentatively suspected that this loss of cover may have led to a decline of between 1-19% in the species' population size over the same time frame.

Trend justification: .

Country/territory distribution

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Congo, The Democratic Republic of the	extant	native	yes
Uganda	extant	native	yes

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name
Congo, The Democratic Republic of the	Forests west of Lake Edward
Congo, The Democratic Republic of the	Itombwe Mountains
Congo, The Democratic Republic of the	Kahuzi-Biega National Park
Congo, The Democratic Republic of the	Mount Hoyo Reserve
Congo, The Democratic Republic of the	Okapi Faunal Reserve
Uganda	Semliki National Park

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	suitable	resident
Forest	Subtropical/Tropical Swamp	suitable	resident
Savanna	Dry	suitable	resident
Altitude	1060 - 1820 m	Occasional altitudinal limits

Recommended citation
BirdLife International (2024) Species factsheet: Sassi's Olive Greenbul Phyllastrephus lorenzi. Downloaded from https://datazone.birdlife.org/species/factsheet/sassis-olive-greenbul-phyllastrephus-lorenzi on 23/12/2024.
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 23/12/2024.