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

Taxonomic note

Myzomela chloroptera and M. batjanensis (del Hoyo and Collar 2016) were previously lumped as M. chloroptera following Sibley & Monroe (1990, 1993).

 

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	C2a(ii)

Red List history

Year	Category	Criteria
2018	Vulnerable	C2a(ii)
2017	Vulnerable	C2a(ii)
2016	Near Threatened	D1
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	high
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	100 km2
Area of Occupancy (breeding/resident)	90 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	poor	estimated	2017
Population trend	decreasing	-	inferred	-
Rate of change over the past 10 years/3 generations (longer of the two periods)	10-19%	-	-	-
Generation length	6 years	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: Assuming that only a fraction of its suitable habitat is occupied and using population densities for conspecifics, this species is estimated at just larger than 2,500 mature individuals (rising to >10,000 if all of the suitable habitat is occupied). Therefore, the population size is tentatively placed in the range 2,500-9,999 mature individuals.

Trend justification: Deforestation rates from Ł. Tracewski (unpubl. data following Tracewski et al. 2016) suggest that the species has lost c.10.5% of suitable habitat over the past 3 generations (18 years), which is believed to be causing a population decline.

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
Forest	Subtropical/Tropical Moist Lowland	suitable	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	1500 - 2200 m	Occasional altitudinal limits	(min) 800 m

Threat (level 1)	Threat (level 2)	Impact and Stresses
Agriculture & aquaculture	Wood & pulp plantations - Small-holder plantations	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%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Bacan Myzomela Myzomela batjanensis. Downloaded from https://datazone.birdlife.org/species/factsheet/bacan-myzomela-myzomela-batjanensis 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.