Geokichla dumasi 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Turdidae

Scientific Name: Geokichla dumasi (Rothschild, 1898)
Common Name(s):
English Buru Thrush, Moluccan Thrush
Zoothera dumasi (Rothschild, 1898)
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.
Taxonomic Notes:

Geokichla dumasi (del Hoyo and Collar 2016) was previously listed as Zoothera dumasi.

Identification information: 17 cm. A medium-sized thrush. Russet crown, nape, and mantle, and dark brown wings, and face to belly. Belly whitish. Broad white tips to greater and median wing-coverts. Similar spp. None in range. Seram Thrush Z. joiceyi similar, but has dark brown mantle and white tips only to median wing-coverts. Voice Generally silent, but gives an easily overlooked thin tseep contact note and tsree-tsree flight call.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2017
Date Assessed: 2017-10-01
Assessor(s): BirdLife International
Reviewer(s): Symes, A.
Contributor(s): Brickle, N. & Lambert, F.
Facilitator/Compiler(s): Bird, J., Khwaja, N., Mahood, S., Pilgrim, J., Symes, A., Westrip, J.
This species is listed as Near Threatened because there are some indications that it has a moderately small, fragmented population within its small range, and it is undergoing a continuing decline owing to trapping. However, the range is not yet severely fragmented or restricted to few locations, and so the species does not currently merit a higher threat category. Further information may indicate it is more threatened.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Geokichla dumasi is endemic to the island of Buru, Indonesia. Little is known about the species, and although it has been described as "not uncommon" (Clement and Hathway 2000), there have been few recent records. Tracewski et al. (2016) estimated the maximum Area of Occupancy (calculated as the remaining tree area within the species’s range) to be c.1,543 km2, rounded here to 1,500 km2.
Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:1500Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:9100
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:NoLower elevation limit (metres):800
Upper elevation limit (metres):1500
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Population estimate = 20 individuals/km2 x 1,700 km2 (20% of EOO) = 34,400 individuals (density range from up to lower quartile of two Asian congeners in BirdLife Bird Population Density Spreadsheet). Perhaps best currently placed in population band of 20,000-49,999 individuals.

Trend Justification:  Although data are very poor, the species may be declining owing to the bird trade.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:20000-49999Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
No. of subpopulations:1Continuing decline in subpopulations:No
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 inhabits dense, lower montane moss-forest, most commonly at 725-1,500 m altitude. It has been suggested that the species is largely restricted to limited areas of level forest within this range (Collar 2004), but it has certainly been seen on steep slopes (F. Lambert in litt. 2005). It feeds alone or in pairs on the ground in deep forest undergrowth (Clement and Hathway 2000). Eggs have been recorded in February, and young in early April (Clement and Hathway 2000).

Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):3
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Hill forest on Buru is considerably more secure than lowland forest, and indeed remains almost intact. Zoothera species are heavily traded elsewhere in Indonesia, because of their abilities as songsters, so it is likely that this is a threat to the species (Collar 2004, N. Brickle in litt. 2005).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
Gunung Kelapat Muda Game Reserve presumably contains a population of this species.

Conservation Actions Proposed
Conduct further surveys to assess the full extent of occurrence of this species, its specific habitat requirements, and its overall population size. Assess the extent to which bird trade is a threat. Effectively protect suitable forest within its range.

Citation: BirdLife International. 2017. Geokichla dumasi. The IUCN Red List of Threatened Species 2017: e.T22733666A118629453. . Downloaded on 21 May 2018.
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