Large Blue Flycatcher (Cyornis magnirostris) | Details

Large Blue Flycatcher Cyornis magnirostris

Current view: Data table and detailed info

Taxonomy

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.

IUCN Red List criteria met and history

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	-

Red List history

Year	Category	Criteria
2022	Near Threatened	A3c+4c
2016	Least Concern
2012	Least Concern
2010	Least Concern
2008	Not Recognised
2004	Not Recognised
2000	Not Recognised
1994	Not Recognised
1988	Not Recognised

Species attributes

Migratory status	full migrant	Forest dependency	high
Land-mass type		Average mass	-

Range

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	193,000 km²
Extent of Occurrence (non-breeding)	152,000 km²
Severely fragmented?	no	-

Population

	Estimate	Data quality	Derivation	Year of estimate
Population size	unknown	-	-	-
Population trend	decreasing	-	suspected	2016-2026
Rate of change over the past 10 years/3 generations (longer of the two periods)	10-19%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	16-25,20-25%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	16-25,20-25%	-	-	-
Generation length	2.61 years	-	-	-
Number of subpopulations	1	-	-	-
Percentage of mature individuals in largest subpopulation	100%	-	-	-

Population justification: The population size is unknown but the species is described as rare in north-east India, but rather common in northern Myanmar where one study (Rasmussen et al. 2011) found it to be among the commonest passerines mist-netted.

Trend justification: Although this species appears tolerant of degraded habitats on passage, all wintering records have been in primary and selectively logged mature secondary forest with a well-developed understorey on the Thai-Malay Peninsula (Sa-ar et al. 2021). Global Forest Watch data indicate that forest cover loss within the wintering range of the species was 14-16% over the past 10 years (Global Forest Watch [2021] using data from Hansen et al. [2013] and methods disclosed therein). This accelerated after 2016, when the rate averaged 1.9-2.1% per annum over the past five years, equivalent to 19-21% over 10 years. Given this species' apparent dependence on this habitat, it is suspected to be declining at a near-equal rate to forest loss. There is no reason to suppose that rates of forest loss in this region are going to slow over the next decade, and they may be accelerating. Consequently, over the next 10 years, the species is suspected to decline by 20-25%.

Country/territory distribution

Country/Territory	Presence	Origin	Breeding visitor	Non-breeding visitor	Passage migrant
Bhutan	extant	native	yes
India	extant	native	yes
Malaysia	extant	native		yes
Myanmar	extant	native	yes	yes	yes
Nepal	extant	native	yes
Thailand	extant	native		yes

Important Bird and Biodiversity Areas (IBA)

Country/Territory	IBA Name

Habitats & altitude

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Artificial/Terrestrial	Rural Gardens	suitable	non-breeding
Artificial/Terrestrial	Urban Areas	suitable	non-breeding
Forest	Subtropical/Tropical Moist Lowland	major	breeding
Forest	Subtropical/Tropical Moist Lowland	major	non-breeding
Forest	Subtropical/Tropical Moist Montane	major	breeding
Shrubland	Subtropical/Tropical Moist	suitable	non-breeding
Altitude	0 - 1800 m	Occasional altitudinal limits	(max) 1900 m

Threats & impact

Threat (level 1)

Threat (level 2)

Impact and Stresses

Agriculture & aquaculture

Annual & perennial non-timber crops - Shifting agriculture

Timing

Scope

Severity

Impact

Ongoing

Minority (<50%)

Slow, Significant Declines

Low Impact: 5

Stresses
Ecosystem degradation, Ecosystem conversion