Taxonomic note
Scepomycter winifredae (del Hoyo and Collar 2016) was previously listed as Bathmocercus winifredae.
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.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | C2a(ii) | C2a(i,ii); D1 |
Year | Category | Criteria |
---|---|---|
2021 | Near Threatened | C2a(i); D1 |
2017 | Vulnerable | B2ab(i,ii,iii,v); C2a(i); D1 |
2016 | Vulnerable | B1ab(i,ii,iii,v); C2a(i); D1 |
2012 | Vulnerable | B1ab(i,ii,iii,v) |
2008 | Vulnerable | B1a+b(i,ii,iii,v) |
2004 | Vulnerable | |
2000 | Vulnerable | |
1996 | Vulnerable | |
1994 | Vulnerable | |
1988 | Threatened |
Migratory status | not a migrant | Forest dependency | high |
Land-mass type |
continent |
Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence (breeding/resident) | 28,300 km2 | medium |
Area of Occupancy (breeding/resident) | 4,444 km2 | |
Severely fragmented? | no | - |
Estimate | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
Population size | 330-1000 mature individuals | poor | suspected | 2016 |
Population trend | decreasing | - | inferred | 2012-2022 |
Rate of change over the past 10 years/3 generations (longer of the two periods) | 1-10% | - | - | - |
Rate of change over the future 10 years/3 generations (longer of the two periods) | 1-10% | - | - | - |
Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 1-10% | - | - | - |
Generation length | 2.73 years | - | - | - |
Number of subpopulations | 2-100 | - | - | - |
Percentage of mature individuals in largest subpopulation | 1-89% | - | - | - |
Population justification: The population size was preliminarily estimated to fall into the band 10,000-19,999 individuals, however this is likely to be too high and may instead be 500-1,500 individuals (L. Hansen in litt. 2016). This roughly equates to 330-1,000 mature individuals.
The species has two subspecies (Pearson and Kirwan 2020), and based on its distribution, it is assumed to form multiple subpopulations. With a suspected population size of 330-1000 mature individuals, it is assumed that there are <1,000 mature individuals in the largest subpopulation.
Trend justification: The population is inferred to be declining owing to ongoing forest loss. Between 2009-2019, forest habitat within this species's range decline by 6.5% (Global Forest Watch 2020). This species can tolerate some disturbance (J. Fjeldså in litt. 2007). Based on the threat of habitat loss, these declines are suspected to continue at the same rate into the future.
Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
---|---|---|---|---|---|---|
Tanzania | extant | native | yes |
Country/Territory | IBA Name |
---|---|
Tanzania | Rubeho Mountains |
Tanzania | Udzungwa Mountains |
Tanzania | Udzungwa National Park |
Tanzania | Ukaguru Mountains |
Tanzania | Uluguru Mountains |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Forest | Subtropical/Tropical Moist Montane | major | resident |
Altitude | 1300 - 2430 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Agriculture & aquaculture | Annual & perennial non-timber crops - Small-holder farming | Timing | Scope | Severity | Impact | ||||
Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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Climate change & severe weather | Habitat shifting & alteration | Timing | Scope | Severity | Impact | ||||
Future | Whole (>90%) | Unknown | Unknown | ||||||
|
Recommended citation
BirdLife International (2024) Species factsheet: Winifred's Warbler Scepomycter winifredae. Downloaded from
https://datazone.birdlife.org/species/factsheet/winifreds-warbler-scepomycter-winifredae 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.