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Oreophasis derbianus 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Aves Galliformes Cracidae

Scientific Name: Oreophasis derbianus Gray, 1844
Common Name(s):
English Horned Guan
Spanish Guan Cornudo, Paují Cornudo, Pava Pajuil, Pavón, Pavón Cornudo
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: 84 cm. Unmistakable, large, black-and-white cracid. Glossy black above with bluish sheen. Whitish flecked black on neck, breast and upper belly with brown flanks and lower belly. Black tail with white band near base. Unusual red horn of bare skin on top of head and small red dewlap. White iris, yellow bill and red legs. Juvenile has reduced horn (develops through first year), and brown tail and wings. Voice Adult males and females differ in their vocalizations. Males utter four types, including a deep, low booming uhmm, uh'mmm uh'mmm, uh'mmm uh'mmm, uh'mmm uh'mmmmm. Females utter around 7-8 vocalisations and variants. Other vocalisations include snorts, clicking and bill-clacking (González-García 1995,  González-García 2001, Brooks and Gee 2006).

Assessment Information [top]

Red List Category & Criteria: Endangered 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): Cóbar Carranza, A., Eisermann, K., Estudillo López, J., González-García, F., Rivas, J., Tanimoto, P. & Cornejo, J.
Facilitator/Compiler(s): Benstead, P., Capper, D., Isherwood, I., Sharpe, C.J., Taylor, J.
Justification:
This species is Endangered because remaining populations are very small, severely fragmented and, given continuing threats, presumably declining (Collar et al. 1992). Further surveys may find this species to be more widespread than recent records suggest, but effective protection of known sites is required if its conservation status is genuinely to improve.

Previously published Red List assessments:

Geographic Range [top]

Range Description:Oreophasis derbianus occurs in the Sierra Madre de Chiapas, Mexico, and throughout west-central Guatemala. In Mexico, there are recent records from El Triunfo, Cerro Venado, Cerro Cebu, Cerro Quetzal and Volcán Tacaná (Cerro Toquián Grande, Chiquihuite, Agua Caliente, Benito Juárez El Plan), and birds have been purportedly collected, and a tail feather found, in the Chimalapas area of Oaxaca (J. Estudillo López in litt. 1994, González-García 1997, F. González-García in litt. 2012). Its occurrence in the Chimalapas, Oaxaca zone, has always been suspected, but never completely confirmed (F. González-García in litt. 2007). Fieldwork in 2005 and interviews with local people at San Antonio and Benito Juarez in the municipalities of San Miguel and Santa María, Chimalapas, suggest the presence of the species (F. González-García in litt. 2007). Verbal evidence suggests the Horned Guan is present in the areas known as Cordón El Retén y Sierra Tres Picos (González-García 2006). In Guatemala, it has been reported in at least 39 localities and its range has been estimated at 1,139.4 km2 (Rivas Romero and Cóbar Carranza 2007). The most recent Guatemalan records are from Cerro Cruz Maltín, Huehuetenango (Cotí 2010) and Chuamazán, Totonicapán (J. L. López per A. J. Cobar in litt. 2012). It was found nesting at Volcán Atitlán in 2005, 2007 and 2011 (Eisermann et al. 2007, Eisermann in litt. 2012) and at Volcan Tolimán in 2000 (Méndez 2010). In September 2007, two juveniles were observed at Volcán San Pedro, and in August 2009, another two juveniles were observed in Albores, Sierra de las Minas, confirming breeding at both sites (J. Rivas in litt. 2007, Quiñonez 2010). Fieldwork and interviews have recently identified new localities, including San Marcos and Sibinal in San Marcos department, and Chiantla and Santa Eulalia in Huehuetenango department (Anon. 2006, Cóbar Carranza and Rivas Romero 2006). Local people report the species from Cerro Tecpán, Chimaltenango, and Cerro El Amay, Quiché (K. Eisermann in litt. 2007), although specific surveys at the latter in 2008, 2010 and 2011 failed to find the species (P. Tanimoto in litt. 2008, Tanimoto 2008, Eisermann & Avendaño 2011, González Madrid 2011, Eisermann in litt. 2012). There are unconfirmed reports from Cerro Volcán Pacayita, Honduras. Unsuccessful searches for the species and interviews with local people in El Trifinio protected area suggest it is absent from this region and does not occur in Honduras (J. Rivas in litt. 2007). Numbers decreased severely during the 20th century and nowhere is it better than uncommon.

Countries occurrence:
Native:
Guatemala; Mexico
Additional data:
Continuing decline in area of occupancy (AOO):Yes
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:56300
Continuing decline in extent of occurrence (EOO):YesExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:6-10Continuing decline in number of locations:Yes
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):1400
Upper elevation limit (metres):3500
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population is thought to number 1,000-2,499 individuals, based on an estimate of 1,000 in late 1970s and more recent information that some areas such as El Triunfo may be secure and hold relatively high densities. The core of this biosphere reserve alone could hold a population of 2,475-3,685 birds, but the band of 1,000-2,499 individuals is precautionarily retained here. This estimate equates to 667-1,666 mature individuals, rounded here to 600-1,700 mature individuals. Population density estimates for El Triunfo are 2.6-5.2 individuals/km2 (González-García 1992, 1994), 4.5-7.1 individuals/km2 (Gomez de Silva et al. 1999) and 3.7 individuals/km2 (Abundis 2006), equivalent to a population of 2,475-3,685 birds for the core of the biosphere reserve (González-García 2005, SEMARNAT 2011).  In Guatemala, at Volcán San Pedro the estimates are 10.5 individuals/km2 (Rivas Romero and Cóbar Carranza 2008) and for Sierra de las Minas the estimates are 1.6 individuals/km2 (Quiñonez 2010).



Trend Justification:  The population is suspected to be declining slowly, in line with the clearance and degradation of cloud-forest within its range, and levels of hunting and trapping.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:600-1700Continuing 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 cloud-forest at 2,000-3,500 m in Guatemala, with exceptional low-elevation records down to 1,200-1,500 m (Escobar-Ortíz 1997, Eisermann in litt. 2012), and 1,400-2,700 m in Mexico. The lack of records from June-August at El Triunfo suggests that it may undertake some altitudinal migration (Gómez de Silva et al. 1999). Breeding generally occurs in January-June, when two eggs are laid (González-García 1995, González-García 2008). At Volcán Atitlán, a bird was found incubating in January 2005 on a nest that was apparently later predated, however an adult and immature were seen together there in November 2005 and January 2006. In November 2005, the immature bird was aged at 6-7 months, suggesting that hatching took place between early April and early May (Eisermann et al. 2007). At Volcán Tolimán two nests were found in March and April (Méndez 2010). Its diet comprises fruit, flowers and leaves (González-García 1994, González-García 2005, F. González-García in litt. 2007, Cóbar Carranza 2006, Rivas Romero and Cóbar Carranza 2008, Quiñonez  2010) and rarely invertebrates (González-García 1994).

Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):5.7
Movement patterns:Not a Migrant

Threats [top]

Major Threat(s): Since the 1960s, logging, firewood-gathering and agricultural expansion have caused extensive deforestation. Forest is presently threatened by clearance for subsistence agriculture, coffee plantations, selective logging and wood extraction (J. Rivas in litt. 2007). In 2009 a forest fire affected more than 330 hectares of cloud forest in Volcán Santo Tomás (A. J. Cóbar in litt. 2012). The loss and degradation of cloud-forest has caused the disappearance of the species from Cuilco, San Sebastian Coatan and the municipal area of San Pedro Soloma, in Guatemala (Cóbar Carranza and Rivas Romero 2006). Areas of forest have been cleared for agriculture in the core and buffer zones of El Triunfo Biosphere Reserve (V. Emanuel per Streiffert 2004, F. González-García in litt. 2012). Forest patches along the Zunil-Retalhuleu road, Guatemala, may be threatened, as they fall within the optimum altitudinal band for coffee-growing (Brooks and Gee 2006). If it is an altitudinal migrant, it will have especially suffered from the replacement of lower montane forests with sun coffee. New roads are opening up areas for exploitation. Disturbance and forest degradation may be caused by roaming cattle (Andrle undated). Hunting is mostly for subsistence (González-García 1993, F. González-García in litt. 1998, 1999): live birds are no longer taken for trade and private collections (J. Cornejo in litt. 2012). The isolation of disjunct subpopulations makes this species especially vulnerable to further local extirpation (Eisermann in litt. 2012).

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
CITES Appendix I and legally protected in Mexico and Guatemala. In 2010 Mexico named the Horned Guan a one of the Conservation Priority Species (Semarnat 2011). An environmental education programme around El Triunfo has been in progress since 2010 (F. González-García in litt. 2012). The issues covered include strengthening local participation actions in the conservation of the Horned Guan, pasture management for local cattle ranchers and sustainable harvesting of dwarf 'shate' palm (F. González-García in litt. 2012). Another project at El Triunfo is concerned with the production of shade-grown coffee. Many coffee farmers are signing up for organic certification, with almost 121.4 km2 (30,000 acres) within the reserve certified by 2004 (Streiffert 2004). In Guatemala, most sites with recent records have protected status (K. Eisermann in litt. 2007). However, deficiencies in management that allow illegal hunting and illegal logging within protected areas are a serious issue for the species's conservation (K. Eisermann in litt. 2007). It has also been stated that there may not be enough suitable habitat incorporated in the national system of protected areas in Guatemala to ensure its survival in these reserves (Cóbar Carranza and Rivas Romero 2006). In Guatemala, communities at Sibinal, San Marcos (Department of San Marcos) and Tecpán (Department of Chimaltenango), at known sites for the species, have formally designated their forests as Municipal Protected Areas (Anon. 2006, A. J. Cóbar Carranza in litt. 2007), and at least one of these has a reforestation programme (Anon. 2006). In Guatemala, Cerro Yaxcalamte, Cerro Cruz Maltín, Municipal Forest of San Marcos and Volcán de Tajumulco have been identified as potential areas for further studies and conservation measures (Cóbar Carranza and Rivas Romero 2006). Horned Guan is a 'flagship species' for the development of local tourism at several sites in Guatemala, fostering local interest and initiatives to protect guan habitat, at Atitlán volcano, San Pedro volcano, and in Sibinal (K. Eisermann in litt. 2007, 2012). In 2002 a Population and Habitat Viability Analysis of the Horned Guan was held in Guatemala. This resulted in an action plan (CBSG, 2002) and the establishment of the International Committee for the Conservation of Oreophasis derbianus and its Habitat, which is active in Mexico and Guatemala, and has organised four symposiums in which advances in conservation have been presented and the action plan reviewed (J. Rivas in litt. 2007, Secaira et al. 2006, J. Cornejo in litt. 2012). The Cloud Ambassadors Program was established in 2007 by Africam Safari to support in situ conservation efforts and create an international ex situ conservation network via the loaning of captive bred animals from Mexico (Cornejo 2008). The program manages a fund to support in situ conservation projects (J. Cornejo in litt. 2012). The captive husbandry of the species has improved in the last years (Cornejo 2008, Cornejo 2009). According to the international studbook of the species, at the end of 2010 the captive population  numbered 88 individuals, held by eleven institutions in six countries (J. Cornejo in litt. 2012).

Conservation Actions Proposed
An detailed conservation action plan for the species has been drawn up by the Mexican federal government (SEMARNAT 2011). Conduct surveys to obtain an estimate of local population densities and the total population size. Survey potential sites, especially in the Chimalapas area (F. González-García in litt. 1998, 1999) and Honduras. Study the species's movements and role in seed dispersal (F. González-García in litt. 2007). Conduct further research and conservation action in key areas in Guatemala (Cóbar Carranza and Rivas Romero 2006). In Guatemala, identify areas where reforestation with native species can be carried out (Cóbar Carranza and Rivas Romero 2006). Monitor local populations and support the captive breeding programme. Monitor rates of cloud-forest destruction and degradation in the species's range. Attempt to quantify the levels of hunting and trapping of this species. Create an international reserve at Volcán Tacaná. Enforce existing laws. Carry out research into its breeding biology using captive birds (Eisermann et al. 2007). Assess the impact of ecotourism on the species and its habitat (K. Eisermann in litt. 2007). Improve the managment of existing protected areas across the species's range. Designate further areas at keys sites and ensure effective management (A. J. Cóbar Carranza in litt. 2007).


Citation: BirdLife International. 2016. Oreophasis derbianus. The IUCN Red List of Threatened Species 2016: e.T22678453A92774672. . Downloaded on 21 September 2017.
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