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Megapodius geelvinkianus 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Galliformes Megapodiidae

Scientific Name: Megapodius geelvinkianus Meyer, 1874
Common Name(s):
English Biak Scrubfowl
Taxonomic Source(s): Jones, D.N., Dekker, R.W.RJ. and Roselaar, C.S. 1995. The Megapodes. Oxford University Press, Oxford, U.K.
Identification information: 36 cm. Medium-sized, all-brown megapode. Plumage largely dark grey with slight crest. Reddish or bluish face. Red or dark grey legs. Similar spp. No other gamebirds occur on these islands. Differs from rails such as Rufous-tailed Bush-hen Amaurornis moluccanus by crest, short bill and leg colour. Voice Various crowing and clucking calls. Hints Commonly heard and seen in Biak Utara Reserve.

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): Beehler, B., Bishop, K.D., Dekker, R., Holmes, D., van Balen, S. & Dutson, G.
Facilitator/Compiler(s): Benstead, P., Bird, J., Davidson, P., Keane, A., Taylor, J., Khwaja, N.
Justification:
This little-known megapode is classified as Vulnerable because of its small population which continues to decline owing to a variety of possible threats.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Megapodius geelvinkianus is endemic to Biak-Supiori in Papua (formerly Irian Jaya), Indonesia, and its satellite islands, Mios Korwar, Numfor, Manim and Mios Num. It is not clear whether one specimen, apparently from Manokwari on mainland Papua, represents a straggler from a nearby island or a mislabelled specimen (Jones et al. 1995). Its population size is unknown, but is believed to be small and declining. It was formerly common on Biak (Mayr and Meyer de Schauensee 1939) and it was heard regularly during the course of field visits to Biak between 1983 and 1997 (K. D. Bishop in litt. 2007), but only "small numbers" were seen during the 1990s on Owi (a satellite of Biak) and Supiori (Jones et al. 1995). It was recorded daily in and around Biak-Utara Reserve in 1997 (S. van Balen and B. M. Beehler in litt. 2000), and is still seen regularly by visitors (S. van Balen in litt. 2012). Overall, the population is thought to be in decline owing to a number of pressures on habitat within its range.

Countries occurrence:
Native:
Indonesia
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:10800
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:11-100Continuing decline in number of locations:Unknown
Extreme fluctuations in the number of locations:No
Upper elevation limit (metres):450
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population is estimated to number 2,500-9,999 mature individuals based on an assessment of known records, descriptions of abundance and range size. This is consistent with recorded population density estimates for congeners or close relatives with a similar body size, and the fact that only a proportion of the estimated Extent of Occurrence is likely to be occupied. This estimate is equivalent to 3,750-14,999 individuals, rounded here to 3,500-15,000 individuals.

Trend Justification:  The species is suspected to be declining at a moderate rate, owing to on-going habitat loss and degradation, and hunting pressure.
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 apparently shy and wary but has been recorded in primary forest, logged forest, secondary growth, dry scrub and scrub near a river. It is regularly seen in disturbed habitat (S. van Balen in litt. 2012). However, there is no information on its habitat preferences, general habits, diet or breeding biology, although these are probably broadly similar to other Megapodius species. It presumably builds nest-mounds or buries its eggs between decaying roots of trees (Jones et al. 1995).

Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):4
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Specific threats are undocumented, but are likely to include egg-collecting (although its widely spaced nest-mounds may reduce this risk (S. van Balen and B. M. Beehler in litt. 2000), hunting (which is a documented threat to other species on the islands) and perhaps predation by introduced mammals (Dekker and McGowan 1995). Much forest on Biak (particularly the southern plains) and Numfor has been destroyed or damaged by logging and subsistence farming; much of the remainder is under pressure (Bishop 1982, K. D. Bishop in litt. 1996, D. Holmes in litt. 2000) although the north part of the island appears to be secure (S. van Balen in litt. 2012). Much of Supiori comprises virtually impenetrable forested limestone mountains, which is likely to be safe from habitat degradation.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
There are two protected areas on the islands, Biak-Utara and Pulau Supiori Nature Reserves, which cover substantial areas of lowland and hill forest on Biak and Supiori (Sujatnika et al. 1995). A further reserve has been proposed for Numfor (Diamond 1986).

Conservation Actions Proposed
Conduct surveys on all known islands of occurrence to assess fully its distribution and current population status. Devise a list of management recommendations, including ensuring adequate protection of nesting areas if different from non-breeding habitats. Assess habitat requirements and threats. Conduct research into its breeding biology. Assess status of forest on Biak-Supiori. Prevent potential introduction of ground predators.


Citation: BirdLife International. 2016. Megapodius geelvinkianus. The IUCN Red List of Threatened Species 2016: e.T22728514A94988793. . Downloaded on 18 December 2017.
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