NT
Mexican Sheartail Doricha eliza



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. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- - -

Red List history
Year Category Criteria
2021 Near Threatened C1
2016 Near Threatened B1ab(i,ii,iii,iv); C1
2014 Near Threatened B1ab(i,ii,iii,iv); C1
2012 Near Threatened B1ab(i,ii,iii,iv);C1
2008 Near Threatened C1; B1a+b(i,ii,iii,iv)
2004 Near Threatened
2000 Lower Risk/Least Concern
1994 Lower Risk/Least Concern
1988 Lower Risk/Least Concern
Species attributes

Migratory status not a migrant Forest dependency Low
Land mass type Land-mass type - continent
Average mass 2 g
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 108,000 medium
Extent of Occurrence breeding/resident (km2) 5,964
Number of locations -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 2500-9999 medium estimated 2012
Population trend Decreasing 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) 3-13 - - -
Decline (10 years/3 generation past and future) 3-13 - - -
Number of subpopulations 2 - - -
Percentage in largest subpopulation 1-89 - - -

Population justification: Based on density estimates of 0.099-0.132 individuals/ha, the population in Veracruz was estimated at fewer than 2,500 indiviudals (Ortiz-Pulido et al. 2002). In Yucatán, no more than 6,000-10,000 individuals were estimated, assuming (optimistically) that the species occurs at a density three to four times higher than in Veracruz (R. Ortiz-Pulido in litt. 2012). This totals to 8,500-12,500 individuals, equating to 5,600-8,300 mature individuals and therefore, the population is here placed in the band 2,500-9,999 mature individuals.

Trend justification: Both populations are suspected to be in decline owing to habitat degradation. Between 1970 and 2017, the species declined moderately by 15-49% (Partners in Flight 2010). Assuming a constant and ongoing decline, this equates to a rate of 3-13% over ten years.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Mexico Centro de Veracruz
Mexico Humedales Costeros del Norte de la Península de Yucatán
Mexico Ichka' Ansijo
Mexico Los Petenes
Mexico Reserva Estatal de Dzilam
Mexico Ría Celestún
Mexico Ría Lagartos
Mexico Laguna del Castillo
Mexico Yum Balam

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Rural Gardens suitable resident
Artificial/Terrestrial Urban Areas suitable resident
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level major resident
Marine Coastal/Supratidal Coastal Sand Dunes major resident
Shrubland Subtropical/Tropical Dry major resident
Altitude 0 - 1450 m Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops - Agro-industry farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Livestock farming & ranching - Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Residential & commercial development Tourism & recreation areas Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Recommended citation
BirdLife International (2022) Species factsheet: Doricha eliza. Downloaded from http://www.birdlife.org on 29/11/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 29/11/2022.