Dierama nixonianum
Hilliard
Pays · région · aire protégée · écorégion · biome
Pas d'interactions documentées pour cette espèce.
Liste rouge IUCN
VU · Vulnérablecritères B1ab(ii,iii,iv)+2ab(ii,iii,iv)↘Décroissante- Évaluation
- 2017 · v3.1
- Altitude
- 760 – 1500 m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
The population has been fragmented due to extensive habitat loss. Known remaining subpopulations predominantly occur on small remnants. Not enough survey data is yet available to estimate the size of the remaining population, but it is declining due to ongoing habitat loss and degradation. Three subpopulations known through historical records are now locally extinct due to habitat loss, and two more require surveys to determine whether they are still extant.
Menaces identifiées(5 menaces classées CMP-IUCN)
1_1Housing & urban areasRapid DeclinesMinority (<50%)Ongoing2_1_2Small-holder farmingOngoing2_1_3Agro-industry farmingOngoing2_2_2Agro-industry plantationsOngoing2_3_3Agro-industry grazing, ranching or farmingOngoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
In the KwaZulu-Natal Midlands, the grassland habitat of this species is extensively irreversibly modified to sugarcane plantations, forestry plantations, subsistence farming and severe overgrazing (transformation nearly 70% calculated using GIS). The population at the type locality is locally extinct, and many others may also be declining or locally extinct due to excessive transformation of the areas where they were collected previously. One known subpopulation is about to disappear under a housing development.
An isolated record from northern KwaZulu-Natal is from an area that is not threatened.
An isolated record from northern KwaZulu-Natal is from an area that is not threatened.
Habitats préférentiels (classification IUCN)
4_5Grassland - Subtropical/Tropical Dry4_7Grassland - Subtropical/Tropical High Altitude
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
This species' habitat is poorly protected. It possibly occurs in the Karkloof Nature Reserve. One subpopulation is known from a private conservancy, and negotiations are underway to have this site contracted as a formal conservation area. It was listed as 'R' in 1996 (Hilton-Taylor 1996), 'VU' in 1999 (Scott-Shaw 1999) and 'EN' in 2009 (Raimondo et al. 2009).
Actions de conservation (1)Conservation Actions Classification Scheme — IUCNExpert
1_1Site/area protection
Stress écologiques (8)Stresses Classification — IUCNExpert
1_1Ecosystem conversion1_1Ecosystem conversion1_1Ecosystem conversion1_1Ecosystem conversion1_2Ecosystem degradation1_2Ecosystem degradation1_2Ecosystem degradation1_2Ecosystem degradation
Priorités de recherche (2)Research Needed Classification — IUCNExpert
1_1Taxonomy1_2Population size, distribution & trends
Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert
Royaumes biogéographiques
Afrotropical
Systèmes (terrestre/eau douce/marin)
Terrestrial
Formes de croissance
Geophyte
Références bibliographiques (6)Sources scientifiques de l'évaluation IUCNExpert
- IUCN. 2017. The IUCN Red List of Threatened Species. Version 2017-2. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 14 September 2017).
- Raimondo, D., von Staden, L., Foden, W., Victor, J.E., Helme, N.A., Turner, R.C., Kamundi, D.A. and Manyama, P.A. (eds). 2009. <i>Red List of South African Plants</i>. Strelitzia 25. South African National Biodiversity Institute, Pretoria.
- Mucina, L. and Rutherford, M.C. 2006. <i>The Vegetation of South Africa, Lesotho and Swaziland</i>. South African National Biodiversity Institute, Pretoria, South Africa.
- Scott-Shaw, C.R. 1999. <i>Rare and Threatened Plants of KwaZulu-Natal and Neighbouring Regions</i>. KwaZulu-Natal Nature Conservation Services, Pietermaritzburg.
- Hilton-Taylor, C. (ed.). 1996. <i>Red Data List of Southern African Plants</i>. Strelitzia 4. National Botanical Institute, Pretoria.
- Hilliard, O.M. and Burtt, O.M. 1991. <i></i>Dierama<i>: the Harebells of Africa</i>. Acorn Books, Johannesburg and London.
Évaluateurs & contributeurs (2)Personnes ayant contribué à l'évaluation IUCNExpert
assessor
von Staden, L., Scott-Shaw, C.R. & Johnson, I.M.
evaluator
Raimondo, D.
von Staden, L., Scott-Shaw, C.R. & Johnson, I.M. 2017. Dierama nixonianum. The IUCN Red List of Threatened Species 2017: e.T63729445A63729448. Accessed on 05 May 2026.
Répartition mondiale
Aucune observation géoréférencée avec précision suffisante (<10 km) dans GBIF pour cette espèce.