Data Zone
Taxonomic note
Thalurania colombica (del Hoyo and Collar 2014) was previously split as T. colombica and T. fannyi following Sibley and Monroe (1990, 1993), and subsequently T. ridgwayi was recognised following AOU (1998).
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.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | C2a(ii) |
| Year | Category | Criteria |
|---|---|---|
| 2018 | Vulnerable | C2a(ii) |
| 2016 | Vulnerable | B1ab(i,ii,iii,v) |
| 2012 | Vulnerable | B1ab(i,ii,iii,v) |
| 2008 | Vulnerable | B1a+b(i,ii,iii,v) |
| 2004 | Vulnerable | |
| 2000 | Vulnerable | |
| 1996 | Vulnerable | |
| 1994 | Vulnerable | |
| 1988 | Lower Risk/Least Concern |
| Migratory status | not a migrant | Forest dependency | high |
| Land-mass type |
continent |
Average mass | 4 g |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence (breeding/resident) | 34,200 km2 | medium |
| Number of locations | 6-10 | - |
| Severely fragmented? | no | - |
| Estimate | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| Population size | 6000-15000 mature individuals | poor | estimated | 2000 |
| Population trend | decreasing | poor | inferred | 1998-2008 |
| Rate of change over the past 10 years/3 generations (longer of the two periods) | 1-9% | - | - | - |
| Rate of change over the future 10 years/3 generations (longer of the two periods) | 1-9% | - | - | - |
| Rate of change over the past & future 10 years/3 generations (longer of the two periods) | 1-9% | - | - | - |
| Generation length | 4.2 years | - | - | - |
| Number of subpopulations | 1 | - | - | - |
| Percentage of mature individuals in largest subpopulation | 100% | - | - | - |
Population justification: The population size is preliminarily estimated to fall into the band 10,000-19,999 individuals. This equates to 6,667-13,333 mature individuals, rounded here to 6,000-15,000 mature individuals.
Trend justification: The species's population is thought to be declining slowly, in line with the on-going clearance of forest for agriculture within its range.
| Country/Territory | Presence | Origin | Resident | Breeding visitor | Non-breeding visitor | Passage migrant |
|---|---|---|---|---|---|---|
| Mexico | extant | native | yes |
| Country/Territory | IBA Name |
|---|---|
| Mexico | Reserva Ecológica Sierra de San Juan |
| Mexico | Sierra de Manantlán |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Artificial/Terrestrial | Plantations | suitable | non-breeding |
| Forest | Subtropical/Tropical Moist Lowland | major | resident |
| Altitude | 250 - 1200 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Agriculture & aquaculture | Annual & perennial non-timber crops - Scale Unknown/Unrecorded | Timing | Scope | Severity | Impact | ||||
| Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
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Recommended citation
BirdLife International (2024) Species factsheet: Mexican Woodnymph Eupherusa ridgwayi. Downloaded from
https://datazone.birdlife.org/species/factsheet/mexican-woodnymph-eupherusa-ridgwayi on 23/12/2024.
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 23/12/2024.