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Thyolo Alethe Alethe choloensis

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable  

IUCN Red List history

Year Category
2013 Endangered
2012 Endangered
2008 Endangered
2004 Endangered
2000 Endangered
1996 Vulnerable
1994 Vulnerable
1988 Threatened

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) 4,700 medium
Number of locations 16 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 1500-7000 medium Suspected 0
Population trend Decreasing medium -
Number of subpopulations 2-100 - - -
Largest subpopulation 251-1000 - - -
Generation length (yrs) 6.5 - - -
Population justification: The world population was thought to be in the range of c.2,500-5,000 mature individuals, however in 2005 the species was discovered on Mt Mabu in Mozambique, where the population is conservatively suspected to number c.2000 individuals, and there are other areas of this country that could hold the species. Thus on the basis that further exploration is required before a reliable estimate of the total population can be made, the population is placed in the range bracket for 2,500-9,999 individuals. This equates to 1,667-6,666 mature individuals, rounded here to 1,500-7,000 mature individuals.
Trend justification: The population is suspected to be declining very rapidly in Malawi in line with the extensive clearance and degradation of highland forests there, and to a lesser degree in Mozambique, with a substantial proportion of the known population occurring on Mt Mabu where there is currently relatively low pressure on the forest. Overall, the rate of decline over 20 years (three generations) is suspected to have been rapid. Further substantial populations may occur in intact forests in unsurveyed areas of Mozambique (Spottiswoode et al. 2008), which, if found to be the case, would have a bearing on the overall proportion of the population that is decreasing and thus the overall rate of decline.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Malawi Native Extant       Yes
Mozambique Native Extant       Yes

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Malawi Liwonde Hills Forest Reserve site factsheet
Malawi Mangochi Mountain Forest Reserve site factsheet
Malawi Mount Mulanje Forest Reserve site factsheet
Malawi Namizimu Forest Reserve site factsheet
Malawi Soche Mountain Forest Reserve site factsheet
Malawi Thyolo Mountain Forest Reserve site factsheet
Mozambique Mount Chiperone site factsheet
Mozambique Mount Mabu site factsheet
Mozambique Mount Namuli site factsheet
Mozambique Njesi plateau site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Dry suitable resident
Forest Subtropical/Tropical Moist Lowland suitable resident
Forest Subtropical/Tropical Moist Montane suitable resident
Savanna Dry suitable resident
Altitude 700 - 1700 m Occasional altitudinal limits 720 - 1900 m

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Agro-industry farming Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) Slow, Significant Decline Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops / Small-holder farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Ecosystem degradation, Ecosystem conversion
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
Human intrusions & disturbance Work & other activities Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Natural system modifications Fire & fire suppression / Trend Unknown/Unrecorded Timing Scope Severity Impact
Past, Likely to Return Minority (<50%) Slow, Significant Decline Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Housing & urban areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Future Minority (<50%) Slow, Significant Decline Low Impact: 3
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2014) Species factsheet: Alethe choloensis. Downloaded from http://www.birdlife.org on 20/10/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 20/10/2014.

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 Turdidae (Thrushes)
Species name author Sclater, 1927
Population size 1500-7000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 4,700 km2
Country endemic? No
Links to further information
- Summary information on this species
- Projected distributions under climate change