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Dendrortyx barbatus 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Galliformes Odontophoridae

Scientific Name: Dendrortyx barbatus Gould, 1846
Common Name(s):
English Bearded Wood-partridge, Bearded Wood Partridge, Bearded Wood-Partridge
Taxonomic Source(s): del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
Identification information: 34 cm. Distinctive, long-tailed forest partridge. Bluish-grey head and neck, with brownish crown and crest. Grey streaked rufous on hindneck, mantle and sides of chest. Rest of underparts cinnamon with mottled grey and brown on thighs and flanks, and dark undertail with white tips. Rest of upperparts brownish mottled black and buff. Red legs, bill and orbital ring. Similar spp. Long-tailed Wood-partridge D. macroura has black head markings. Singing Quail Dactylortyx thoracicus is much smaller and shorter tailed. Voice Loud series of whistles three or four syllables ko-orr-ee-ee with emphasis on the last notes. Female softer with more notes.

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2cd+3cd+4cd;B1ab(i,ii,iii,v);C2a(i) ver 3.1
Year Published: 2016
Date Assessed: 2016-10-01
Assessor(s): BirdLife International
Reviewer(s): Butchart, S. & Symes, A.
Contributor(s): Carroll, J. & Eitniear, J.
Facilitator/Compiler(s): Benstead, P., Capper, D., Keane, A., Sharpe, C.J., Taylor, J.
Justification:
Recent surveys have found this species to be more widespread and numerous than previously thought, but it still has a small range and a population which continues to decline rapidly (Collar et al. 1992, Keane et al. unpubl.). It therefore qualifies as Vulnerable.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Dendrortyx barbatus is confined to the Sierra Madre Oriental and Sierra Madre de Oaxaca in east Mexico. Surveys in 1994-1998 confirmed its presence in several areas. The total population probably comprises fewer than 5,400 individuals (Eitniear et al. 2000). The largest populations are thought to be found in Veracruz (<2,000 individuals), where it occurs from Coatepec west through the Metlac Basin to Orizaba (Howell and Webb 1992, Eitniear et al. 2000, J. C. Eitniear in litt. 2004), and in Querétaro in the Sierra Gorda and adjacent areas (Eitniear et al. 1999, Eitniear et al. 2000, Rojas-Soto et al. 2001, Eitniear and Baccus 2002) (<3,000 individuals), although the extent of suitable habitat here is not known precisely. The species has recently been found at up to 20 new sites in Querétaro, suggesting that it is even more widespread in the state than previously thought (R. Pedraza per J. C. Eitniear in litt. 2007). Small numbers are thought to occur in Hildago (Howell and Webb 1992, Gómez de Silva and Aguilar Rodríguez 1994, J. Eitniear in litt. 2004) (<100 individuals), San Luis Potosi in the Sierra Gorda (J. C. Eitniear in litt. 1999, Eitniear et al. 2000) (<200 individuals) and Puebla (Aguilar-Rodrigues 2000) (<100 individuals). There are also records from the Sierra Mazateca in Oaxaca (Aguilar Rodríguez 1999). The spate of recent records suggests that it is more numerous than previously thought, but remaining populations are fragmented and, perhaps with the exception of those in the remote Sierra Gorda, continuing to decline.

Countries occurrence:
Native:
Mexico
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:36000
Continuing decline in extent of occurrence (EOO):YesExtreme 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:NoLower elevation limit (metres):900
Upper elevation limit (metres):2200
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The total population probably comprises fewer than 5,400 individuals (J. Eitniear in litt. 2000), roughly equivalent to 3,600 mature individuals.

Trend Justification:  Remaining populations of this species are fragmented and, perhaps with the exception of those in the remote Sierra Gorda, are suspected to be continuing to decline rapidly, owing mainly to habitat loss and degradation.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:3600Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:Yes
No. of subpopulations:2-100Continuing decline in subpopulations:Unknown
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:No

Habitat and Ecology [top]

Habitat and Ecology:It inhabits humid montane and pine-oak forest at elevations of 900-3,100 m, but has been recorded in older, second-growth forest, and edge and disturbed habitats associated with agriculture including shade coffee (Montejo and Tejeda 1996, Eitniear et al. 1999, Eitniear and Baccus 2002). Many fragmented populations are restricted to vegetation along creeks and rivers (J. C. Eitniear in litt. 1999). Observations of birds breeding in captivity indicate that egg-laying takes place in February-April (Cornejo 2007). The clutch size ranges from four to eight, but normally numbers six, and the incubation period is normally 28-32 days (Cornejo 2007).

Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):3.9
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Habitat destruction and fragmentation are the result of logging, clearance for agriculture, road-building, tourist developments, intensive urbanisation, sheep-ranching and grazing (Dinerstein et al. 1995). Conversion from shade to sun coffee is a serious threat to some areas of habitat (Eitniear and Baccus 2002, J. C. Eitniear in litt. 2004). Fragmented populations are susceptible to subsistence hunting, predators, genetic retrogression and further human encroachment (J. C. Eitniear in litt. 1999). In Veracruz, there is widespread conversion of habitat to monoculture crops, human settlement and livestock-grazing (Eitniear et al. 1999) and there have been reports of hunting with dogs with little discrimination between species (Eitniear and Baccus 2002, J. C. Eitniear in litt. 2004). In Hidalgo, there is little remaining habitat.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
There are recent records from Sierra Gorda Biosphere Reserve (Eitniear et al. 2000) and near Pico Orizaba National Park (Montejo and Tejeda 1996). There are historical records from areas now within Cofre de Perote and Cañon del Río Blanco National Parks, but the species's current status in these reserves is unknown. Environmental education in Veracruz has included the development of posters and roadway signs (J. Carroll in litt. 1999).

Conservation Actions Proposed
Carry out surveys to obtain an up-to-date total population estimate. Monitor the rates of habitat loss and degradation across its range. Implement a conservation awareness programme for the Sierra Gorda, targeting villages near known populations. Document habitat requirements, especially within the Sierra Gorda. Survey for additional populations in San Luis Potosi, Hidalgo, Veracruz and Oaxaca. Conduct research to determine the level of gene flow between the northern and southern parts of the species's range.


Citation: BirdLife International. 2016. Dendrortyx barbatus. The IUCN Red List of Threatened Species 2016: e.T22679576A92819853. . Downloaded on 24 October 2017.
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