email a friend
printable version
EN
Grauer's Swamp-warbler Bradypterus graueri

IUCN Red List Criteria

Critically Endangered  
Endangered B2ab(ii,iii,iv,v) 
Vulnerable B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v) 

IUCN Red List history

Year Category
2012 Endangered
2008 Endangered
2004 Endangered
2000 Endangered
1996 Vulnerable
1994 Vulnerable
1988 Threatened

Species attributes

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

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 15,400 medium
Area of Occupancy breeding/resident (km2) 250 good
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals medium Estimated 2007
Population trend Decreasing medium -
Number of subpopulations - - -
Largest subpopulation - - -
Generation length (yrs) 3.5 - - -
Population justification: The density at Kamiranzovu Swamp, Nyungwe, is about 13 birds per ha based on surveys of singing birds; the swamp is c.25km2, resulting in an estimate of 33,000 birds at this site alone (A. Plumptre in litt. 2007). Therefore the total population is conservatively estimated to be somewhere in the range 20,000-49,000 individuals.
Trend justification: The population is suspected to be in decline owing to the drainage of marshes for agriculture and the cutting and burning of marsh vegetation. The likely rate of decline has not been estimated.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Burundi Native Extant       Yes
Congo, The Democratic Republic of the Native Extant       Yes
Rwanda Native Extant       Yes
Uganda Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Burundi Kibira National Park site factsheet
Congo, The Democratic Republic of the Forests west of Lake Edward site factsheet
Congo, The Democratic Republic of the Kahuzi-Biega National Park site factsheet
Congo, The Democratic Republic of the Virunga National Park site factsheet
Rwanda Nyungwe National Park site factsheet
Rwanda Rugezi Marsh site factsheet
Rwanda Volcans National Park site factsheet
Uganda Bwindi Impenetrable National Park site factsheet
Uganda Echuya Forest Reserve site factsheet
Uganda Mgahinga Gorilla National Park site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) major resident
Wetlands (inland) Permanent Freshwater Marshes/Pools (under 8ha) major resident
Altitude 1950 - 2600 m Occasional altitudinal limits (max) 2750 m

Threats & impact

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 Decline Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching / Small-holder grazing, ranching or farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Gathering terrestrial plants / Unintentional effects (species is not the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Energy production & mining Mining & quarrying Timing Scope Severity Impact
Past, Unlikely to Return Minority (<50%) Negligible declines Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2014) Species factsheet: Bradypterus graueri. Downloaded from http://www.birdlife.org on 18/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/09/2014.

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 Endangered
Family Sylviidae (Old World warblers)
Species name author Neumann, 1908
Population size mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 15,400 km2
Country endemic? No
Links to further information
- Summary information on this species
- Projected distributions under climate change