Quercus agrifolia

Née

Plante

LCLR Monde (IUCN)

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Filtrer le graphe par contexte spatialPays · région · aire protégée · écorégion · biome

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Calcul du tissu écologique de Quercus agrifolia.

Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 5s).

Liste rouge IUCN

LC · Préoccupation mineure→Stable

Évaluation complète

Évaluation: 2016 · v3.1
Altitude: 0 – 1500 m
Profondeur: – m

État de la populationTexte officiel évaluation IUCNExpert

The total population size of Quercus agrifolia has not been quantified, and although it faces various stresses such as development, agriculture and disease (sudden oak death) in specific areas across its range, it is considered stable overall, with no reports of serious declines. NatureServe lists this species as globally secure (G5).

Menaces identifiées(6 menaces classées CMP-IUCN)

1_1
Housing & urban areas
Causing/Could cause fluctuationsMinority (<50%)Ongoing
2_1_3
Agro-industry farming
Causing/Could cause fluctuationsMinority (<50%)Ongoing
8_4_2
Named species
Causing/Could cause fluctuationsMinority (<50%)Ongoing
2_3_3
Agro-industry grazing, ranching or farming
Negligible declinesMinority (<50%)Ongoing
5_3_2
Intentional use: (large scale) [harvest]
Negligible declinesMinority (<50%)Ongoing
7_1_3
Trend Unknown/Unrecorded
Negligible declinesMinority (<50%)Ongoing

Description complète des menacesTexte détaillé évaluation IUCNExpert

Mature Q. agrifolia are very susceptible to sudden oak death, which can wipe out an initially healthy tree within a few weeks to several years. In California the disease has reached "epidemic proportions" and there is particular risk on California's central coast. A study on Coast Live Oaks in two sites in Marin County showed infection rates of 35% in 2000 and 38% in 2001, and 16% in 2000 and 19% in 2001, respectively. Coast Live Oak mortality at the two sites increased from 8% to 15% and 6% to 8% over that year of study (McPherson et al. 2002). Fire is another potential threat, but overall recovery of the species seems to be excellent, with 96% survivorship at postfire year eight (Dagit 2002).

Urban and agricultural development do pose some threat to the species, as well as areas of firewood harvesting, and heavy grazing from livestock which affects recruitment. However, all threats are patchy and reveal problems in localized areas only, so that the overall vitality of the species can remain in good standing.

Habitats préférentiels (classification IUCN)

1_4Forest - Temperate★
3_4Shrubland - Temperate★

Mesures de conservation recommandéesStratégies de conservation IUCNExpert

California Legislature passed the California Oak Woodland Conservation Act in 2001, recognizing the importance of California’s oak woodlands ascetically, monetarily and ecologically. Along with the act, the Oak Woodland Conservation Program was established. This program provides $10 million, allocated by the Wildlife Conservation Board (WCB), to allow landowners, conservation organizations, cities and counties to gain funding for projects designed to conserve and restore California’s oak woodlands (University of California 2015).

The species is also found ex situ in 52 botanic gardens and arboreta globally, according to Botanic Gardens Conservation International.

Stress écologiques (7)Stresses Classification — IUCNExpert

1_1Ecosystem conversion
1_1Ecosystem conversion
2_1Species mortality
2_1Species mortality
2_1Species mortality
2_2Species disturbance
2_2Species disturbance

Usage & commerce (2)Use & Trade — IUCNExpert

13Pets/display animals, horticulture
national
7Fuels
national

Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert

Royaumes biogéographiques

Nearctic

Systèmes (terrestre/eau douce/marin)

Terrestrial

Formes de croissance

Shrub - largeTree - largeTree - small

Références bibliographiques (10)Sources scientifiques de l'évaluation IUCNExpert

BGCI. 2017. PlantSearch. Available at: <a href="www.bgci.org/plant_search.php">www.bgci.org/plant_search.php</a>.
IUCN. 2016. The IUCN Red List of Threatened Species. Version 2016-1. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 30 June 2016).
Standiford, R.B. 2015. Valley Oak Conservation. University of California, Oak Woodland Management. Available at: <a href="http://ucanr.edu/sites/oak_range/Oak_Articles_On_Line/Oak_Woodland_Ecology_and_Monitoring/Valley_Oak_Conservation/">http://ucanr.edu/sites/oak_range/Oak_Articles_On_Line/Oak_Woodland_Ecology_and_Monitoring/Valley_Oak_Conservation/</a>. (Accessed: September 14, 2015).
GBIF. 2015. Global Biodiversity Information Facility (GBIF) Occurrence Download. Available at: <a href="http://www.gbif.org/">http://www.gbif.org/</a>. (Accessed: September 2015).
USDA, NRCS. 2013. Fact Sheets & Plant Guides. Available at: <a href="http://plants.usda.gov/java/factSheet">http://plants.usda.gov/java/factSheet</a>.
NatureServe. 2012. NatureServe Explorer: An online encyclopedia of life. [web application] Version 7.1. Arlington, Virginia Available at: <a href="http://www.natureserve.org">http://www.natureserve.org</a>.
Dagit, R. 2002. Post-fire Monitoring of Coast Live Oaks (Quercus agrifolia) Burned in the 1993 Old Topanga Fire. USDA Forest Service Gen. Tech. Rep.
Steinberg, P.D. 2002. Quercus agrifolia. In: Fire Effects Information System. Available at: <a href="http://www.fs.fed.us/database/feis/plants/tree/queagr/all.html">http://www.fs.fed.us/database/feis/plants/tree/queagr/all.html</a>. (Accessed: 10 September 2015).
McPherson, B.A., Wood, D.L., Storer, A.J., Kelly, N.M. and Standiford, R.B. 2002. Sudden Oak Death: Disease Trends in Marin County Plots after One Year. USDA Forest Service Gen. Tech. Rep.
Pavlik, B.M., Muick, P.C., Johnson, S.G. and Popper, M. 1991. Oaks of California. Cachuma Press, Inc., Los Olivos.

Évaluateurs & contributeurs (2)Personnes ayant contribué à l'évaluation IUCNExpert

assessor

Beckman, E.

evaluator

Oldfield, S.

Beckman, E. 2016. Quercus agrifolia. The IUCN Red List of Threatened Species 2016: e.T194049A2295175. Accessed on 05 May 2026.

Indicateurs écologiquesTolérance thermique · radar EIVE · triangle CSR

Niche thermique

GlobTherm — Bennett 2018

Limites thermiques expérimentales (CTmin/CTmax/LT50 selon publication, mesures en chambre climatique). Repères France à titre indicatif uniquement.

-10 °C68 °C

Limites physiologiques ? – 62.4 °C
T° moy. France 1981-2010 11.0 °C
Projection France 2050 ≈ 13.7 °C

Sources : GlobTherm (Bennett et al. 2018). Repères France : T moy annuelle CHELSA 1981-2010 + projection DRIAS-2020 GWL20 (+2,7 °C). GlobTherm filtré aux groupes pour lesquels la comparaison à la T air a du sens (ectothermes terrestres + plantes) — exclut endothermes et aquatiques où la nature de la mesure (TNZ ou T eau) rend la comparaison non interprétable.