• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

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.

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

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	108,000 km2	medium
Area of Occupancy (breeding/resident)	5,964 km2
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	2500-9999 mature individuals	medium	estimated	2012
Population trend	decreasing	-	suspected	2016-2025
Rate of change over the past 10 years/3 generations (longer of the two periods)	3-13%	-	-	-
Rate of change over the future 10 years/3 generations (longer of the two periods)	3-13%	-	-	-
Rate of change over the past & future 10 years/3 generations (longer of the two periods)	3-13%	-	-	-
Generation length	2.04 years	-	-	-
Number of subpopulations	2	-	-	-
Percentage of mature individuals 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	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Mexico	extant	native	yes

Country/Territory	IBA Name
Mexico	Centro de Veracruz
Mexico	Ichka' Ansijo
Mexico	Reserva Estatal de Dzilam
Mexico	Ría Celestún
Mexico	Ría Lagartos

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

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

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Recommended citation
BirdLife International (2024) Species factsheet: Mexican Sheartail Doricha eliza. Downloaded from https://datazone.birdlife.org/species/factsheet/mexican-sheartail-doricha-eliza on 24/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 24/12/2024.