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

Taxonomic note

Eumyias additus (del Hoyo and Collar 2016) was previously listed as Rhinomyias additus. Monotypic.

Taxonomic source(s)
Handbook of the Birds of the World and BirdLife International. 2023. Handbook of the Birds of the World and BirdLife International digital checklist of the birds of the world. Version 8. Available at: https://datazone.birdlife.org/userfiles/file/Species/Taxonomy/HBW-BirdLife_Checklist_v8_Dec23.zip.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2023	Near Threatened	B1b(iii)
2016	Near Threatened	B1ab(iii)
2012	Near Threatened	B1ab(iii)
2008	Near Threatened	B1a+b(iii)
2004	Near Threatened
2000	Lower Risk/Near Threatened
1996	Vulnerable
1994	Vulnerable
1988	Near Threatened

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	6,400 km2	medium
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	36000-100000, 36000-50000 mature individuals	medium	estimated	2021
Population trend	decreasing	-	suspected	2016-2026
Rate of change over the past 10 years/3 generations (longer of the two periods)	1-9,5%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	1-9,5%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	1-9,5%	-	-	-
Generation length	3.11 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: In this species' range, there was c.3,000 km² of forest (with >50% canopy cover) in 2021 (per Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein). Poulsen (1998) recorded densities of Eumyias additus of 20.4-32.7 birds/km² in primary and modified lowland habitat, with a much higher density of 92.6 birds/km² in montane forest. This altitudinal difference is reaffirmed by Poulsen and Lambert (2000) who noted a significantly higher encounter rate in montane forest. The majority of individuals documented by Poulsen (1998) were aurally detected, thus are likely to refer to mature individuals. Accounting for a range of density scenarios, and occupancy of 30-50%, the population is estimated to number 36,000-100,000 mature individuals, with a best (and precautionary) estimate of 36,000-50,000.

Trend justification: In the ten years to 2021, forest cover in this species' range reduced by c.4-5% (Global Forest Watch 2022, based on data from Hansen et al. [2013] and methods disclosed therein), and this is thought to have had broadly equivalent impacts on the species' population size. Although selective logging and degradation is not accounted for in these data, E. additus is capable of persisting in logged and modified forest (see Poulsen 1998). Thus the species is suspected of having declined by 1-9% (with a best estimate of 5%) over the past ten years, and the same rate is precautionarily suspected to continue into the future.

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

Country/Territory	IBA Name
Indonesia	Danau Rana
Indonesia	Gunung Kepala Madang

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Subtropical/Tropical Moist Lowland	major	resident
Forest	Subtropical/Tropical Moist Montane	major	resident
Altitude	500 - 1500 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	Logging & wood harvesting - Unintentional effects: (large scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Ecosystem degradation, Ecosystem conversion

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Recommended citation
BirdLife International (2024) Species factsheet: Buru Warbling-flycatcher Eumyias additus. Downloaded from https://datazone.birdlife.org/species/factsheet/buru-warbling-flycatcher-eumyias-additus 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.