Cyornis caerulatus

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

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Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
ANIMALIA	CHORDATA	AVES	PASSERIFORMES	MUSCICAPIDAE

Scientific Name:

Cyornis caerulatus

Species Authority:

(Bonaparte, 1857)

Common Name/s:

English

–

Large-billed Blue-flycatcher, Large-billed Blue-Flycatcher, Sunda Blue Flycatcher

Assessment Information [top]

Red List Category & Criteria:

Vulnerable A2c+3c+4c ver 3.1

Year Published:

2012

Assessor/s:

BirdLife International

Reviewer/s:

Butchart, S. & Symes, A.

Contributor/s:

Brickle, N. & Poulsen, M.

Justification:
This species qualifies as Vulnerable because it is suspected to be undergoing a rapid population decline as it is restricted to low-lying forest in a region where this habitat-type is being cleared and degraded at a rapid rate.

History:

2008	–	Vulnerable
2004	–	Vulnerable
2000	–	Vulnerable
1988	–	Near Threatened

Geographic Range [top]

Range Description:	Cyornis caerulata occurs on Borneo (including Brunei, Sabah and Sarawak, Malaysia, and Kalimantan, Indonesia) and Sumatra, Indonesia, where it is resident in humid lowland evergreen forest, ascending foothills locally to mid-altitudes. It appears to be rather patchily distributed, occurring at relatively low densities and generally uncommon.
Countries:	Native: Brunei Darussalam; Indonesia; Malaysia
Range Map:	Click here to open the map viewer and explore range.

Population [top]

Population:	The population size is preliminarily estimated to fall into the band 10,000-19,999 individuals. This equates to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.
Population Trend:	Decreasing

Habitat and Ecology [top]

Habitat and Ecology:	It frequents the middle and understoreys of primary, selectively logged and mature secondary dryland rainforest, tending to occur in more dense or tangled areas or at edges of clearings. Although the species has been found to tolerate selectively logged and secondary rainforest, it occurs at much lower densities in these habitats (Ansell et al. 2010, Derhé 2010, Hua et al. 2011). It is often replaced in riverine forest by Malaysian Blue-flycatcher C. turcosa.
Systems:	Terrestrial

Habitat and Ecology:

It frequents the middle and understoreys of primary, selectively logged and mature secondary dryland rainforest, tending to occur in more dense or tangled areas or at edges of clearings. Although the species has been found to tolerate selectively logged and secondary rainforest, it occurs at much lower densities in these habitats (Ansell et al. 2010, Derhé 2010, Hua et al. 2011). It is often replaced in riverine forest by Malaysian Blue-flycatcher C. turcosa.

Systems:

Terrestrial

Threats [top]

Major Threat(s):	The species has been reported to occur at lower population densities in secondary and selectively forests than in primary forests (Ansell et al. 2010, Derhé 2010, Hua et al. 2011). Given its preference for primary lowland forest and restriction to Sumatra and Borneo, it is likely to be in steep decline from habitat loss, primarily through agricultural conversion following industrial-scale logging (even in some protected areas). Kalimantan lost just under 25% of its 1985 lowland forest cover in the subsequent 12 years, resulting in the prediction that this habitat-type could be eradicated from the entire province by 2010 if changes in policy and management were not forthcoming. Rates of loss on Sumatra were even higher, with 30% of lowland forest loss in the same 12-year period. Fire is also a threat to the species's habitat, with the major fires of 1997-1998 affecting 50,000 km² of forest on Sumatra and Borneo and damaging at least 17 of Indonesia's parks and reserves. Following previous major conflagrations in 1972 and 1982-1983, the 1997-1998 fires accelerated the desiccation of the forest environment, halting regrowth and rendering unburnt adjacent areas ever more vulnerable to fire and ever poorer in biodiversity.

Major Threat(s):

The species has been reported to occur at lower population densities in secondary and selectively forests than in primary forests (Ansell et al. 2010, Derhé 2010, Hua et al. 2011). Given its preference for primary lowland forest and restriction to Sumatra and Borneo, it is likely to be in steep decline from habitat loss, primarily through agricultural conversion following industrial-scale logging (even in some protected areas). Kalimantan lost just under 25% of its 1985 lowland forest cover in the subsequent 12 years, resulting in the prediction that this habitat-type could be eradicated from the entire province by 2010 if changes in policy and management were not forthcoming. Rates of loss on Sumatra were even higher, with 30% of lowland forest loss in the same 12-year period. Fire is also a threat to the species's habitat, with the major fires of 1997-1998 affecting 50,000 km² of forest on Sumatra and Borneo and damaging at least 17 of Indonesia's parks and reserves. Following previous major conflagrations in 1972 and 1982-1983, the 1997-1998 fires accelerated the desiccation of the forest environment, halting regrowth and rendering unburnt adjacent areas ever more vulnerable to fire and ever poorer in biodiversity.

Conservation Actions [top]

Conservation Actions:	Conservation Actions Underway It occurs in various protected areas throughout its range, including Sepilok Forest Reserve (Sabah), Gunung Mulu National Park (Sarawak), Kutai National Park (Kalimantan), Kerinci-Seblat and Way Kambas National Parks (Sumatra). Conservation Actions Proposed Conduct surveys to investigate its population size and trends, ecological requirements and determine whether any specific conservation measures are needed. Provide support for the conservation and management of lowland protected areas in Sumatra and Borneo. Lobby for reduced logging of lowland forest in the Sundaic region.

Conservation Actions:

Conservation Actions Underway
It occurs in various protected areas throughout its range, including Sepilok Forest Reserve (Sabah), Gunung Mulu National Park (Sarawak), Kutai National Park (Kalimantan), Kerinci-Seblat and Way Kambas National Parks (Sumatra).

Conservation Actions Proposed
Conduct surveys to investigate its population size and trends, ecological requirements and determine whether any specific conservation measures are needed. Provide support for the conservation and management of lowland protected areas in Sumatra and Borneo. Lobby for reduced logging of lowland forest in the Sundaic region.

Citation:	BirdLife International 2012. Cyornis caerulatus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 20 June 2013.
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