• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	C2a(ii)

Red List history

Year	Category	Criteria
2022	Vulnerable	C2a(ii)
2016	Vulnerable	C2a(ii)
2014	Vulnerable	C2a(ii)
2012	Not Recognised
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Migratory status	not a migrant	Forest dependency	low
Land-mass type		Average mass	130 g

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	3,500 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	poor	estimated	2012
Population trend	decreasing	-	inferred	-
Generation length	4.7 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: A preliminary population estimate based on expert knowledge is of 3,000-4,000 individuals, based on rates of encounter within the range of the species (M. Halaouate in litt. 2012). Hence the population size was estimated to fall in the wider band of 2,500-9,999 mature individuals. With reports of a recent notable reduction in abundance a re-estimation of the density and population size is required, but in the absence of a new estimate the existing value is retained.

Trend justification: Recent reports suggest that the species is undergoing a rapid and concerning population reduction. Visiting birdwatchers have noted that the species was very difficult to locate in 2019, while it was common five years previously (Bergmark 2019). Encounters remain regular however, with most visits to the island seeking endemic birds still locating the species (Bergmark 2019, Bocos 2019).

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

Country/Territory	IBA Name

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

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%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion
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
Biological resource use	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion

Purpose	Scale
Pets/display animals, horticulture	subsistence, national, international

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Recommended citation
BirdLife International (2024) Species factsheet: Biak Lorikeet Trichoglossus rosenbergii. Downloaded from https://datazone.birdlife.org/species/factsheet/biak-lorikeet-trichoglossus-rosenbergii on 23/11/2024.
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 23/11/2024.