Caprimulgus concretus


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Caprimulgus concretus
Species Authority: Bonaparte, 1850
Common Name(s):
English Bonaparte's Nightjar, Bonaparte's Nightjar

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2c+3c+4c ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Davison, G., Yong, D., Bishop, K., Yong, D. & Brickle, N.
Facilitator/Compiler(s): Benstead, P., Bird, J., Taylor, J., Tobias, J., Allinson, T
This species qualifies as Vulnerable because it is restricted to low-lying forest in a region where this habitat-type is being cleared and degraded at such a catastrophic rate that rapid and continuing population declines are suspected.

Geographic Range [top]

Range Description: Caprimulgus concretus occurs on Sumatra, Belitung Island and Kalimantan (Borneo), Indonesia, Brunei, and Sabah and Sarawak (Borneo), Malaysia, where it is locally common, but rarely recorded (BirdLife International 2001). Most recent observations are from South Sumatra (e.g. Way Kambas National Park) and East Borneo (e.g. Danum Valley) (D. Yong in litt. 2012). it has also been recorded recently near the Barito river in Central Kalimantan (N. Brickle in litt. 2012). This patchiness of distribution at least partly reflects the ease with which it is overlooked, but it does appear genuinely rare at many localities.

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 mature individuals. This equates to 15,000-29,999 individuals in total, rounded here to 15,000-30,000 individuals.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It is restricted to lower elevations (one record from 900 m, but usually below 500 m) where it frequents forest, perhaps particularly clearings and edges, heath forest and secondary growth. The true nature of its habitat use is uncertain, although it has been observed foraging from a perch inside forest.

Systems: Terrestrial

Threats [top]

Major Threat(s): If this bird is an extreme lowland forest specialist, as appears possible, then it must be in steep decline from habitat loss. Rates of forest loss in the Sundaic lowlands have been extremely rapid (Kalimantan lost nearly 25% of its evergreen forest during 1985-1997, and Sumatra lost almost 30% of its 1985 cover), because of a variety of factors, including the escalation of logging and land conversion, with deliberate targeting of all remaining stands of valuable timber including those inside protected areas. Furthermore, the major fires of 1997-1998 affected c.50,000 km2 of forest on Sumatra and Borneo, damaged at least 17 of Indonesia's parks and reserves and, following previous major conflagrations in 1972 and 1982-1983, accelerated the desiccation of the forest environment that renders regrowth and unburnt adjacent areas more vulnerable to fire and poorer in biodiversity.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
The species occurs at Way Kambas National Park, Sumatra, Gunung Niut Nature Reserve, Kalimantan and the Danum Valley Conservation Area (Sabah). Further research is likely to reveal its presence at other lowland protected areas in the future.

Conservation Actions Proposed
Conduct surveys throughout the three islands that it occupies using knowledge of its distinctive call as the basis. Investigate its altitudinal distribution, ecological requirements and the levels of threat that it faces and thereby determine whether any specific conservation measures are required. Support the conservation of relevant lowland protected areas. Lobby for reduced logging of lowland forest in the Sundaic region.

Citation: BirdLife International 2012. Caprimulgus concretus. The IUCN Red List of Threatened Species. Version 2015.2. <>. Downloaded on 30 August 2015.
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