• 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.
Dowsett, R. J.; Forbes-Watson, A. D. 1993. Checklist of birds of the Afrotropical and Malagasy regions. Tauraco Press, Li
Sibley, C. G.; Monroe, B. L. 1990. Distribution and taxonomy of birds of the world. Yale University Press, New Haven, USA.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	B1ab(i,ii,iii,iv,v); C2a(i)

Red List history

Year	Category	Criteria
2016	Vulnerable	B1ab(i,ii,iii,iv,v);C2a(i)
2012	Vulnerable	B1ab(i,ii,iii,iv,v);C2a(i)
2008	Vulnerable	B1a+b(i,ii,iii,iv,v); C2a(i)
2006	Vulnerable
2004	Vulnerable
2000	Vulnerable
1994	Lower Risk/Least Concern
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	123,000 km2	medium
Number of locations	11-100	-
Severely fragmented?	yes	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	medium	estimated	2000
Population trend	decreasing	medium	suspected	1998-2008
Generation length	3.5 years	-	-	-
Number of subpopulations	4	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: The paucity of atlas records strongly suggests that it is far rarer than previously thought, and probably numbers c.2,500 individuals. Some of the atlas data may, however, be misleading as the area between Durban and East London in the former Transkei was not well covered, giving the impression of a discontinuous distribution (N. Smith in litt. 2007, Taylor 2015), thus it is probably best placed in the band 2,500-9,999 mature individuals. This estimate equates to 3,750-14,999 individuals in total, rounded here to 3,500-15,000 individuals.

Trend justification: This species's population is suspected to be declining in line with habitat loss and degradation within its range. The likely rate of decline, however, has not been estimated.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
South Africa	extant	native	yes

Country/Territory	IBA Name
South Africa	Tsitsikamma - Plettenberg Bay
South Africa	Woody Cape Section: Addo Elephant National Park

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Urban Areas	suitable	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Shrubland	Subtropical/Tropical Dry	major	resident
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Gathering terrestrial plants - Unintentional effects (species is not the target)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Indirect ecosystem effects
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, Inbreeding, Ecosystem conversion
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Very Rapid Declines		High Impact: 8
		Stresses Indirect ecosystem effects, Ecosystem degradation
Natural system modifications	Fire & fire suppression - Trend Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Knysna Warbler Bradypterus sylvaticus. Downloaded from https://datazone.birdlife.org/species/factsheet/knysna-warbler-bradypterus-sylvaticus 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.