Margarornis bellulus 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Passeriformes Furnariidae

Scientific Name: Margarornis bellulus Nelson, 1912
Common Name(s):
English Beautiful Treerunner
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.

Assessment Information [top]

Red List Category & Criteria: Near Threatened ver 3.1
Year Published: 2017
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Angehr, G.
Facilitator/Compiler(s): Isherwood, I., O'Brien, A., Sharpe, C.J., Taylor, J., Wheatley, H.
This species is listed as Near Threatened because it has an extremely small range, in which it is potentially threatened by the clearance and degradation of its habitat in the near future. Habitat at the elevational range occupied by this species is not thought to be seriously threatened at present. However, the species might qualify for uplisting to a higher threat category if it is found that threats to lowland forest are extending into higher elevations.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Margarornis bellulus has a restricted distribution in the highlands of east Panama, where it is rare on Cerro Quía and in the Jungurudó, Pirre, Tacarcuna and Majé mountain ranges (Wetmore 1972, Robbins et al. 1985, Ridgely and Gwynne 1989, Wege 1996, Angehr and Jordán 1998, G. R. Angehr in litt. 1998).

Countries occurrence:
Additional data:
Continuing decline in area of occupancy (AOO):Unknown
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:11700
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):1350
Upper elevation limit (metres):1600
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The global population size has not been quantified, but this species is described as 'uncommon' (Stotz et al. 1996).

Trend Justification:  The population is suspected to be stable in the absence of evidence for any declines or substantial threats.
Current Population Trend:Stable
Additional data:
Number of mature individuals:UnknownContinuing decline of mature individuals:Unknown
Extreme fluctuations:NoPopulation severely fragmented:No
Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No
No. of individuals in largest subpopulation:100

Habitat and Ecology [top]

Habitat and Ecology:This species inhabits montane cloud forest on summits and higher ridges, mostly at 1,350-1,600 m, but to 900 m on Cerro Quía (Ridgely and Gwynne 1989, Wege 1996). It feeds on arthropods, gleaning prey from branches and epiphytic vegetation, mostly in the subcanopy (del Hoyo et al. 2003).

Continuing decline in area, extent and/or quality of habitat:Unknown
Generation Length (years):3.8
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Habitat in the region is being cleared and degraded for mining, agriculture and cultivation of coca (Wege 1996), but probably not yet within the altitudinal range of this species. Completion of the Pan-American Highway link through Darién could be highly detrimental to this species (Wege 1996).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
The Serranía de Majé is unprotected, but the remainder of the species's range falls within the Darién National Park (IUCN 1992, Wege 1996). However, this legal designation has not halted habitat loss (Wege 1996).

Conservation Actions Proposed
Conduct surveys to assess the total population size. Carry out regular surveys to monitor population trends. Monitor rates of habitat loss and degradation within the species's range. Improve the management (effective habitat protection) of Darién National Park.

Amended [top]

Amended reason: Map edited: Changed presence in Colombia from Extant to Possibly Extant. EOO updated.

Citation: BirdLife International. 2017. Margarornis bellulus (amended version of assessment). The IUCN Red List of Threatened Species 2017: e.T22702726A118598501. . Downloaded on 26 April 2018.
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