EN
Horned Guan Oreophasis derbianus



Taxonomy

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. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
del Hoyo, J.; Collar, N. J.; Christie, D. A.; Elliott, A.; Fishpool, L. D. C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Barcelona, Spain and Cambridge UK: Lynx Edicions and BirdLife International.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- C2a(i) B1ab(i,ii,iii,iv,v);C2a(i);D1

Red List history
Year Category Criteria
2016 Endangered C2a(i)
2013 Endangered C2a(i)
2012 Endangered C2a(i)
2008 Endangered C2a(i)
2004 Endangered
2000 Endangered
1996 Vulnerable
1994 Vulnerable
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Land-mass type - continent
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 56,300 medium
Number of locations 6-10 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 600-1700 medium estimated 2000
Population trend Decreasing poor suspected -
Decline (3 years/1 generation past) - - -
Decline (5 years/1 generation past) - - -
Decline (10 years/1 generation past) - - -
Decline (10 years/3 generation future) 1-9 - - -
Decline (10 years/3 generation past and future) 1-9 - - -
Number of subpopulations 2-100 - - -
Largest subpopulations - - -
Generation length (yrs) 5.7 - - -

Population justification: 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.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Guatemala N Extant Yes
Mexico N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Guatemala Antigua Guatemala
Guatemala Atitlan
Guatemala Cerro El Amay
Guatemala Cuchumatanes
Guatemala Santiaguito Volcano (part of Guatemalan/Mexican Pacific Coastal Mountains AZE)
Guatemala Sierra de las Minas - Motagua
Guatemala Tacana - Tajumulco (part of Guatemalan/Mexican Pacific Coastal Mountains AZE)
Mexico Chimalapas
Mexico The Tacaná
Mexico The Triunfo

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Forest Subtropical/Tropical Moist Montane major resident
Altitude 1400 - 3500 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Past, Likely to Return Majority (50-90%) Slow, Significant Declines Past Impact
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Logging & wood harvesting Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Future Whole (>90%) Unknown Unknown
Stresses
Indirect ecosystem effects, Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Utilisation
Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Non-trivial Recent
Pets Whole Adults and juveniles Wild International Non-trivial Recent

Recommended citation
BirdLife International (2018) Species factsheet: Oreophasis derbianus. Downloaded from http://www.birdlife.org on 18/07/2018. Recommended citation for factsheets for more than one species: BirdLife International (2018) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 18/07/2018.