Amaurornis magnirostris 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Gruiformes Rallidae

Scientific Name: Amaurornis magnirostris Lambert, 1998
Common Name(s):
English Talaud Bush-hen
Taxonomic Source(s): Lambert, F. R. 1998. A new species of Amaurornis from the Talaud Islands, Indonesia, and a review of taxonomy of bush hens occurring from the Philippines to Australasia. Bulletin of the British Ornithologists' Club 118: 67-82.
Identification information: 30.5 cm. A large, dark and robust bush-hen with a strikingly robust bill. Head dark brown; upperparts dark rich brown; underparts very dark grey, but flanks and thighs more like upperparts. Bill pale green, legs olive-brown, yellow at front. Similar spp differs from A. moluccana in its darker underparts which lack pale undertail-coverts, but is very similar to though slightly larger than the allopatric Plain Bush-hen A. olivacea. Large headed, with a broader bill than other species and a distinctly arched culmen.

Assessment Information [top]

Red List Category & Criteria: Vulnerable C2a(ii) ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Lambert, F., Riley, J., Wardill, J. & Dymond, N.
Facilitator/Compiler(s): Bird, J., Butchart, S., Taylor, J., Martin, R
This species is endemic to a small island and has a single small population which is in decline owing primarily to habitat loss. It therefore qualifies as Vulnerable.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Amaurornis magnirostris was only recently described, and is currently known only from Karakelang (=Karakelong) Island in the Talaud Archipelago, Indonesia, where it is sympatric with Rufous-tailed Waterhen A. moluccana (Lambert 1998). The population is estimated at 2,350-9,560 individuals (Riley 2003). It may also occur on neighbouring islands, in particular Salibabu (=Salebabu) and Kabaruang (Lambert 1998), but less than 20 km2 of forest occurs on these two islands, much of it degraded (Riley 2003).

Countries occurrence:
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:1200
Continuing decline in extent of occurrence (EOO):UnknownExtreme fluctuations in extent of occurrence (EOO):No
Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Riley (2003) estimated the population to number 2,350-9,560 individuals, thus here it is placed in the band for 2,500-9,999 mature individuals. This roughly equates to 3,750-14,999 individuals in total, rounded here to 3,500-15,000 individuals.

Trend Justification:  The species is suspected to be in decline owing to hunting and forest degradation. The likely rate of decline, however, has not been estimated.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:2500-9999Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
No. of subpopulations:1Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:Yes
No. of individuals in largest subpopulation:100

Habitat and Ecology [top]

Habitat and Ecology:It is a forest species, but also occurs at lower densities in rank vegetation, scrub, and overgrown plantations up to 3 km from the forest edge (Lambert 1998, Riley 2003), and has been reported from wet swampy habitat (N. Dymond in litt. 2009).

Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):3.7
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Approximately 350 km2 of primary forest remains on Karakelang, within two protected areas, but there has been no management and these areas are threatened by agricultural encroachment, illegal logging, and fire (Lambert 1998, Riley 2003). Rails are also trapped for food, but mainly outside forests (Riley 2003). Introduced rats, probably Ricefield Rat Rattus argentiventer, are present on Karakelang, and may also pose a threat (Lambert 1998, Riley 2003)

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
Approximately 350 km2 of primary forest remains on Karakelang, within two protected areas. Although 350 km2 of primary forest has some form of protected status on Karakelang, 250 km2 as a Wildlife Reserve, there is, at present, no management of these sites. Since 1995, the "Action Sampiri" project has been conducting fieldwork and conservation awareness programmes on the island. Introducing adequate protection measures to the newly gazetted Wildlife Reserve is the focus of a forthcoming four-year GEF project.

Conservation Actions Proposed
Survey neighbouring islands, in particular Salibabu (=Salebabu) and Kabaruang. Prevent illegal logging and hunting in the two protected areas within which this species occurs.

Citation: BirdLife International. 2016. Amaurornis magnirostris. The IUCN Red List of Threatened Species 2016: e.T22732147A95043197. . Downloaded on 21 July 2018.
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