Wolkberg Cycad
Encephalartos dolomiticusLavranos & D.L.Goode
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Pays · région · aire protégée · écorégion · biome
Graphe en cours d’indexation
Calcul du tissu écologique de Encephalartos dolomiticus.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 5s).
Liste rouge IUCN
CR · En danger critiquecritères A2acd+4ad; B2ab(i,ii,iv,v); C1+2a(i); D↘Décroissante- Évaluation
- 2022 · v3.1
- Altitude
- 1100 – 1600 m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
This species has experienced rapid and dramatic declines due to the illegal harvest of plants from the wild. The most recent count in 2019 recorded only 4 medium/large plants but there are unconfirmed reports that these plants have also been removed by collectors.
The numbers of plants that originally existed is unknown. Early helicopter surveys from 1993 recorded 158 plants and 151 plants were recorded in follow up surveys in 2004. The latter included 17 newly discovered plants and implies a decline from 158 to 134 plants for those that were counted in 1993 (9% decline over 10 years). In a subsequent 2012 aerial survey of the wild population, a total of 139 plants were counted. In 2019, this had declined to only 4 plants. Assuming an original population estimate of 175 mature plants in 1993 (=158 counted in 1993 + 17 new plants recorded in 2004), this implies a minimum 98% decline from 1993 to 2019.
The numbers of plants that originally existed is unknown. Early helicopter surveys from 1993 recorded 158 plants and 151 plants were recorded in follow up surveys in 2004. The latter included 17 newly discovered plants and implies a decline from 158 to 134 plants for those that were counted in 1993 (9% decline over 10 years). In a subsequent 2012 aerial survey of the wild population, a total of 139 plants were counted. In 2019, this had declined to only 4 plants. Assuming an original population estimate of 175 mature plants in 1993 (=158 counted in 1993 + 17 new plants recorded in 2004), this implies a minimum 98% decline from 1993 to 2019.
Menaces identifiées(1 menace classée CMP-IUCN)
5_2_1Intentional use (species is the target)Rapid DeclinesWhole (>90%)Ongoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
Illegal collection from wild subpopulations has had a drastic effect on the number of plants in the wild. This may prevent reproduction from taking place. The population has been decimated to the extent that a maximum of only four plants remain in the wild.
Habitats préférentiels (classification IUCN)
4_5Grassland - Subtropical/Tropical Dry6Rocky areas (eg. inland cliffs, mountain peaks)
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
This species is listed in Appendix I of the CITES Appendices and on Threatened and Protected species lists in South Africa. A biodiversity management plan was published in 2017 but with few actions to save the few surviving plants.
Actions de conservation (3)Conservation Actions Classification Scheme — IUCNExpert
1_1Site/area protection2_1Site/area management4_3Awareness & communications
Stress écologiques (3)Stresses Classification — IUCNExpert
2_1Species mortality2_3_7Reduced reproductive success2_3_8Other
Usage & commerce (2)Use & Trade — IUCNExpert
13Pets/display animals, horticultureinternationalnational16Establishing ex-situ production *national
Priorités de recherche (4)Research Needed Classification — IUCNExpert
1_2Population size, distribution & trends1_3Life history & ecology1_6Actions3_1Population trends
Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert
Royaumes biogéographiques
Afrotropical
Systèmes (terrestre/eau douce/marin)
Terrestrial
Formes de croissance
Cycad
Références bibliographiques (6)Sources scientifiques de l'évaluation IUCNExpert
- IUCN. 2022. The IUCN Red List of Threatened Species. Version 2022-1. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 21 July 2022).
- Scientific Authority. 2016. <i>Non-Detriment Findings</i>. Government Gazette, Department of Environmental Affairs.
- Scientific Authority. 2013. <i>National Environmental Management: Biodiversity Act (10/2004): Non-detriment findings</i>. Government Printer, Pretoria.
- Vorster, P. 1992. Focus on <i>Encephalartos dolomiticus</i>. <i>Encephalartos</i> 30: 3-7.
- Robbertse, P.J., Vorster, P. and van der Westhuizen, S. 1988. <i>Encephalartos verrucosus</i> (Zamiaceae): a new species from the north-eastern Transvaal. <i>South African Journal of Botany</i> 54(5): 487-490.
- Lavranos, J.J. and Goode, D.L. 1988. Notes on Southern African Cycadales. <i>Bulletin du Jardin Botanique National de Belgique. Brussels</i> 58: 219-224.
Évaluateurs & contributeurs (3)Personnes ayant contribué à l'évaluation IUCNExpert
assessor
Bösenberg, J.D.
contributor
Rodgers, S. & Donaldson, J.S.
evaluator
Donaldson, J.S.
Bösenberg, J.D. 2022. Encephalartos dolomiticus. The IUCN Red List of Threatened Species 2022: e.T41885A50905617. Accessed on 05 May 2026.
Distribution mondiale
Calcul de la distribution GBIF· ~10–60 s
Phénologie
Calcul du calendrier d'apparition· ~5–30 s
Consulter sur les bases externes
Observations & statuts
Cartographie
Note nomenclaturale & synonymesDétails taxonomiques + synonymes CoLExpert
Note nomenclaturale
TAXREF v18 — INPN/MNHNSynonymes (1)— redirigent vers cette page
- Encephalartos verrucosusVorster, Robbertse & S.van der Westh.
Sources : Catalogue of Life Cross-References (synonymes) · TAXREF v18 INPN/MNHN (commentaires FR).