email a friend
printable version
VU
Knysna Warbler Bradypterus sylvaticus

IUCN Red List Criteria

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

IUCN Red List history

Year Category
2012 Vulnerable
2008 Vulnerable
2006 Vulnerable
2004 Vulnerable
2000 Vulnerable
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 8,800 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 medium Estimated 2000
Population trend Decreasing medium -
Number of subpopulations 4 - - -
Largest subpopulation 251-1000 - - -
Generation length (yrs) 3.5 - - -
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), 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 distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
South Africa Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
South Africa Alexandria coastal belt site factsheet
South Africa Outeniqua mountains site factsheet
South Africa Southern Langeberg mountains site factsheet
South Africa Tsitsikamma National Park site factsheet

Habitats & altitude

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 0 - 0 m Occasional altitudinal limits  

Threats & impact

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 Decline 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 Medium Impact: 7
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 Decline Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2014) Species factsheet: Bradypterus sylvaticus. Downloaded from http://www.birdlife.org on 28/08/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/08/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Vulnerable
Family Sylviidae (Old World warblers)
Species name author Sundevall, 1860
Population size 2500-9999 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 8,800 km2
Country endemic? Yes
Links to further information
- Summary information on this species
- Projected distributions under climate change