NT
Sumba Green-pigeon Treron teysmannii



Taxonomy

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red List criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2022 Near Threatened B1b(iii); C2a(ii)
2016 Near Threatened C2a(ii)
2012 Near Threatened C2a(ii)
2008 Near Threatened C2a(ii)
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Near Threatened
1988 Threatened
Species attributes

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

Estimate Data quality
Extent of Occurrence (breeding/resident) 9,500 km2 medium
Severely fragmented? no -
Population
Estimate Data quality Derivation Year of estimate
Population size 10000-15000 mature individuals medium estimated 2021
Population trend decreasing poor suspected 2016-2029
Rate of change over the past 10 years/3 generations (longer of the two periods) 1-9% - - -
Rate of change over the future 10 years/3 generations (longer of the two periods) 1-9% - - -
Rate of change over the past & future 10 years/3 generations (longer of the two periods) 1-9% - - -
Generation length 4.5 years - - -
Number of subpopulations 1 - - -
Percentage of mature individuals in largest subpopulation 100% - - -

Population justification: The species was recorded to occur at densities of 8.1 individuals/km2 (Jones et al. 1995). According to Global Forest Watch (2022, based on data and methods from Hansen et al. [2013]), there was c.2,200 km2 of forest (excluding plantations) in its range in 2021. The species is unable to occupy all habitat (some of which may occur in patches too small), but it is able to tolerate second growth and plantations (Eaton et al. 2021, eBird 2022) in some areas. Consequently, the population is estimated to number 10,000-15,000 mature individuals.

Trend justification: The population is suspected to be declining due to habitat loss and, to a much lesser extent, impacts of localised hunting. In the three generations (13.5 years; Bird et al. 2020) to 2021, forest cover loss in this species' range was reduced by c.5% (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein). As a forest-dependent species, the population size reduction is thought to be approximately equivalent, although it may cope with some degradation. Impacts of hunting are thought to be highly localised and not driving substantial population declines. Overall therefore, the species is suspected of declining at an ongoing rate of 1-9% over three generations.


Country/territory distribution
Country/Territory Presence Origin Resident Breeding visitor Non-breeding visitor Passage migrant
Indonesia extant native yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Indonesia Laiwanggi Wanggameti
Indonesia Luku Melolo
Indonesia Manupeu Tanadaru
Indonesia Poronumbu
Indonesia Tanjung Ngunju
Indonesia Yawila

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Lowland major resident
Altitude 0 - 800 m Occasional altitudinal limits  

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 Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species mortality
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Utilisation
Purpose Scale
Food - human subsistence

Recommended citation
BirdLife International (2024) Species factsheet: Sumba Green-pigeon Treron teysmannii. Downloaded from https://datazone.birdlife.org/species/factsheet/sumba-green-pigeon-treron-teysmannii 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.