Quercus delgadoana
S.Valencia, Nixon & L.M.Kelly
Pays · région · aire protégée · écorégion · biome
Pas d'interactions documentées pour cette espèce.
Liste rouge IUCN
EN · En dangercritères B2ab(iii)?Inconnue- Évaluation
- 2018 · v3.1
- Altitude
- 1400 – 2210 m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
Although Quercus delgadoana can be a dominant species where it is occurs, the cloud forests where it is found have been greatly diminished due to deforestation for traditional agriculture and coffee plantations (Valencia Ávalos 2011). Quercus delgadoana is often found in association with beech forest communities, in these areas it does not form extensive populations and only isolated individuals can be found (E. Chanes pers. comm. 2017). Because cloud forest distribution in Mexico is already narrow, the continued deforestation over the past 80 years has greatly exacerbated the isolation of forest fragments (Toledo-Aceves 2014).
Although there is no quantitative information on the population size of Q. delgadoana, it can be inferred that the population is declining. Studies from the beech forests in Hidalgo, where Q. delgadoana sampling has been the most active, indicate that it is a dominant tree in areas with minimal human disturbance such as La Mojonera and El Medio Monte. In contrast, when Q. delgadoana has been identified in El Gosco forest it has only been found as isolated individuals. There are high levels of disturbance in the El Gosco forests with illegal logging of Quercus spp. which has resulted in an altered species composition. The habitat of beech forests has also been declining, only 11 of the original 14 beech forests in Hidalgo have been relocated. This represents the majority of beech forests communities as Hidalgo contains 73.9% of this forest type in Mexico (Chanes 2014, Ortiz-Quijano 2016).
Although there is no quantitative information on the population size of Q. delgadoana, it can be inferred that the population is declining. Studies from the beech forests in Hidalgo, where Q. delgadoana sampling has been the most active, indicate that it is a dominant tree in areas with minimal human disturbance such as La Mojonera and El Medio Monte. In contrast, when Q. delgadoana has been identified in El Gosco forest it has only been found as isolated individuals. There are high levels of disturbance in the El Gosco forests with illegal logging of Quercus spp. which has resulted in an altered species composition. The habitat of beech forests has also been declining, only 11 of the original 14 beech forests in Hidalgo have been relocated. This represents the majority of beech forests communities as Hidalgo contains 73.9% of this forest type in Mexico (Chanes 2014, Ortiz-Quijano 2016).
Menaces identifiées(3 menaces classées CMP-IUCN)
2_1_2Small-holder farmingUnknownUnknownOngoing5_3_1Intentional use: (subsistence/small scale) [harvest]UnknownUnknownOngoing5_3_3Unintentional effects: (subsistence/small scale) [harvest]UnknownUnknownOngoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
The cloud forest communities in eastern Mexico, where Quercus delgadoana is found, are highly disturbed as a result of the extraction of firewood, the establishment of coffee plantations, and the clearance of forest for pasture (Valencia 2011, González-Espinosa 2011). Cloud forests are a naturally limited habitat and deforestation has further isolated forest patches (Toledo-Aceves 2014). Quercus species are selectively logged for firewood in the beech forests plant associations where Q. delgadoana can be found as a dominant species. As a result, the composition of the canopy has changed as well as the structural values of the species; there has been an increase in species that can be considered opportunistic, indicators of disturbance and/or of a warmer climate and lower water availability (Chanes 2014).
Habitats préférentiels (classification IUCN)
1_9Forest - Subtropical/Tropical Moist Montane★
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
Quercus delgadoana is found in one ex situ site worldwide (BGCI 2017).
Actions de conservation (3)Conservation Actions Classification Scheme — IUCNExpert
1_1Site/area protection3_4_1Captive breeding/artificial propagation4_3Awareness & communications
Stress écologiques (12)Stresses Classification — IUCNExpert
1_1Ecosystem conversion1_1Ecosystem conversion1_1Ecosystem conversion1_2Ecosystem degradation1_2Ecosystem degradation1_2Ecosystem degradation2_1Species mortality2_1Species mortality2_1Species mortality2_2Species disturbance2_2Species disturbance2_2Species disturbance
Usage & commerce (3)Use & Trade — IUCNExpert
12Handicrafts, jewellery, etc.subsistance7Fuelssubsistance9Construction or structural materialssubsistance
Priorités de recherche (2)Research Needed Classification — IUCNExpert
1_2Population size, distribution & trends3_1Population trends
Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert
Royaumes biogéographiques
Nearctic
Systèmes (terrestre/eau douce/marin)
Terrestrial
Formes de croissance
Tree - large
Références bibliographiques (9)Sources scientifiques de l'évaluation IUCNExpert
- IUCN. 2018. The IUCN Red List of Threatened Species. Version 2018-1. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 28 June 2018).
- Walte-Vega, J.K., García-Romero, A., Manzo-Delgado, L.L. and López-García, J. 2017. Factores de distribución de las comunidades del bosque húmedo de montaña. Volcán Cofre de Perote, México. <i>Bosque</i> 38(1): DOI: /10.4067/S0717-92002017000100004.
- Ortiz-Quijano, A.B., Sánchez-González, A., López-Mata, L. and Villanueva-Díaz, J.J. 2016. Population structure of of <i>Fagus grandifolia</i> subsp. <i>mexicana</i> in the cloud forest of Hidalgo State, Mexico. <i>Botanical Sciences</i> 94(3): 483-497.
- Chanes, E. 2014. Composición florística, estructura y distribución espacial de los bosques de haya (<i>Fagus grandifolia</i> subsp. <i>mexicana</i>) del estado de Hidalgo, Mexico. Universidad Nacional Autonoma de Mexico.
- Valencia-A., S. and Gual-Diaz, M. 2014. La familia Fagaceae en el bosque mesófilo de montaña de México. <i>Botanical Sciences</i> 92(2): 193-204.
- Toledo-Aceves, T., García - Franco, J.G., Williams - Linera, G., MacMillan, K. and Gallardo - Hernández, C. 2014. Significance of remnant cloud forest fragments as reservoirs of tree and epiphytic bromeliad diversity. <i>Tropical Conservation Science</i> 7(2): 230-243.
- Valencia Ávalos, S., Nixon, K.C. and Kelly, L.M. 2011. <i>Quercus delgadoana</i> (Fagaceae), a New Species from the Sierra Madre Oriental, Mexico. <i>Novon</i> 21(2): 274–277.
- González-Espinosa, M., Meave, J.A., Lorea-Hernández, F.G., Ibarra-Manríquez, G. and Newton, A.C. (eds). 2011. <i>The Red List of Mexican Cloud Forest Trees</i>. pp. 152. FFI, BGCI, Cambridge, UK.
- Pons, J. and Pausas, J.G. 2007. Acorn dispersal estimated by radio-tracking. <i>Oecologia</i> 153: 903-911.
Évaluateurs & contributeurs (2)Personnes ayant contribué à l'évaluation IUCNExpert
assessor
Jerome, D.
evaluator
Rivers, M.C. & Samain, M.-S.
Jerome, D. 2018. Quercus delgadoana. The IUCN Red List of Threatened Species 2018: e.T78911189A78911192. Accessed on 05 May 2026.
Répartition mondiale
Aucune observation géoréférencée avec précision suffisante (<10 km) dans GBIF pour cette espèce.