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

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	D1

Red List history

Year	Category	Criteria
2022	Near Threatened	D1
2016	Near Threatened	D1
2012	Near Threatened	D1
2008	Near Threatened	D1
2004	Near Threatened
2000	Vulnerable
1996	Data Deficient
1994	Data Deficient
1988	Threatened

Migratory status	not a migrant	Forest dependency	does not normally occur in forest
Land-mass type	continent	Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	179,000 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	600-1700 mature individuals	poor	suspected	2003
Population trend	stable	-	suspected	-
Generation length	2.72 years	-	-	-
Number of subpopulations	2-100	-	-	-

Population justification: Fontaine (2003) suggests its population is 'not more than a few thousand individuals', and so it is tentatively placed in the band 1,000-2,499 individuals here. This is equivalent to 667-1,666 mature individuals, rounded here to 600-1,700 mature individuals. This value however requires confirmation, and the species may be less rare than previously thought, as its preferred habitat is mainly inaccessible and records are sparse (Fontaine 2003).

Trend justification: The population is suspected to be overall stable. Although there is the potential threat of swamp drainage (Urban et al. 1997), the species is present within a number of protected areas across its range, and the inaccessibility of its preferred habitat likely  provides an additional level of protection.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Cameroon	extant	native	yes
Central African Republic	extant	native	yes
Gabon	extant	native	yes

Country/Territory	IBA Name
Cameroon	Lobéké National Park
Cameroon	Nki
Central African Republic	Dzanga-Ndoki National Park
Gabon	Lopé Faunal Reserve

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	major	resident
Altitude	400 - 800 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation
Natural system modifications	Dams & water management/use - Abstraction of surface water (agricultural use)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Ecosystem degradation

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Recommended citation
BirdLife International (2024) Species factsheet: Dja River Swamp-warbler Bradypterus grandis. Downloaded from https://datazone.birdlife.org/species/factsheet/dja-river-swamp-warbler-bradypterus-grandis on 22/11/2024.
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 22/11/2024.