EN
Scarlet-breasted Lorikeet Trichoglossus forsteni



Taxonomy

Taxonomic note

Trichoglossus haematodus, T. forsteni, T. capistratus, T. weberi, T. rubritorquis, T. moluccanus and T. rosenbergii (del Hoyo and Collar 2014) were previously lumped as T. haematodus following Christidis and Boles (1994), and before then were split as T. haematodus and T. rubritorquis following Sibley and Monroe (1990, 1993).

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
- A2d+3d+4d; C2a(i) A2d+3d+4d; C2a(i); D1

Red List history
Year Category Criteria
2020 Endangered A2d+3d+4d; C2a(i)
2016 Vulnerable C2a(i)
2014 Near Threatened A2cd+3cd+4cd
Species attributes

Migratory status nomadic Forest dependency Low
Land mass type Average mass 130 g
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 34,500 medium
Number of locations 10-19 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 500-1500 poor suspected 2020
Population trend Decreasing inferred -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 50-79 - - -
Decline (10 years/3 generation past and future) 50-79 - - -
Number of subpopulations 3-5 - - -
Percentage in largest subpopulation 1-89 - - -
Generation length (yrs) 5 - - -

Population justification: Population density estimates of the congener Coconut Lorikeet (Trichoglossus haematodus) number 1.9-33 individuals/km2 for Sumbawa (Marsden 1999). Assuming that 10% of the mapped range is occupied by the species, Scarlet-breasted Lorikeet may therefore number 2,100-37,000 individuals, roughly equating to 1,400-25,000 mature individuals. However, the population is thought to number closer to the lower end of the estimate, and considering the known rarity of the species due to increasing pressure from trapping for trade, the population is suspected to be below 1,500 mature individuals. Thus, population size is tentatively placed here in the band of 500-1,500 mature individuals. It is further considered that the largest population on Sumbawa may not exceed 250 mature individuals.

Trend justification: The population is suspected to be undergoing a rapid decline of 50-79% over a three-generation period (15 years; Bird et al. 2020) owing to unsustainable levels of exploitation.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Indonesia N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Plantations suitable resident
Artificial/Terrestrial Urban Areas suitable resident
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable resident
Forest Subtropical/Tropical Moist Lowland suitable resident
Forest Subtropical/Tropical Moist Montane suitable resident
Forest Subtropical/Tropical Swamp suitable resident
Shrubland Subtropical/Tropical Dry suitable resident
Shrubland Subtropical/Tropical Moist suitable resident
Wetlands (inland) Bogs, Marshes, Swamps, Fens, Peatlands suitable resident
Altitude 0 - 700 m Occasional altitudinal limits  

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
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species disturbance, Ecosystem degradation, Ecosystem conversion, Species mortality
Agriculture & aquaculture Wood & pulp plantations - Agro-industry plantations Timing Scope Severity Impact
Ongoing Minority (<50%) Very Rapid Declines Medium Impact: 7
Stresses
Species mortality
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Species mortality
Natural system modifications Other ecosystem modifications Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species disturbance, Ecosystem degradation, Ecosystem conversion

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food - human - - Non-trivial Recent
Pets/display animals, horticulture - - International Non-trivial Recent

Recommended citation
BirdLife International (2021) Species factsheet: Trichoglossus forsteni. Downloaded from http://www.birdlife.org on 26/11/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 26/11/2021.