Dioscorea arcuatinervis
Hochr.
Graphe en cours d’indexation
Calcul du tissu écologique de Dioscorea arcuatinervis.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 5s).
Liste rouge IUCN
NT · Quasi menacéecritères A3c; B2ab(iii)?Inconnue- Évaluation
- 2017 · v3.1
- Altitude
- 0 – 1174 m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
No population estimates of mature individuals are available. However, studies by Jeannoda et al. (2007) in the Brickaville region, Toamasina, found plants growing in high densities of up to 680 stems per hectare. This magnitude of abundance is in agreement with observations by others and it is thought that Dioscorea arcuatinervis is common throughout its range subject to suitable habitat.
Menaces identifiées(3 menaces classées CMP-IUCN)
5_3_3Unintentional effects: (subsistence/small scale) [harvest]Rapid DeclinesUnknownOngoing2_1_1Shifting agricultureVery Rapid DeclinesUnknownOngoing5_2_1Intentional use (species is the target)Very Rapid DeclinesUnknownOngoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
As Dioscorea arcuatinervis has been found to occur in abundance where suitable habitat is available, the primary threat presented to this species is the loss of forest habitat, especially littoral forest which has seen very high rates of destruction (Consiglio et al. 2006). This may be through small scale logging or deforestation to accommodate expanding settlements and associated agriculture.
Habitats préférentiels (classification IUCN)
1_6Forest - Subtropical/Tropical Moist Lowland★
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
Currently there are no conservation measures in place. Parts of the species range overlaps with protected areas especially Makira Forest Protected Area and Masoala National Park, as well as Andasibe, Vohimana, Moramanga and Corridor Ankeniheny Zahamena. However, the (apparent) core of the population, a strip of coastline extending 200 km south from Toamasina, Toamasina province, does not include any areas receiving formal protection. There is one known ex situ collection (BGCI 2016) and further collections are recommended.
Actions de conservation (3)Conservation Actions Classification Scheme — IUCNExpert
1_1Site/area protection1_2Resource & habitat protection3_4_2Genome resource bank
Stress écologiques (9)Stresses Classification — IUCNExpert
1_1Ecosystem conversion1_1Ecosystem conversion1_2Ecosystem degradation1_2Ecosystem degradation2_1Species mortality2_2Species disturbance2_2Species disturbance2_2Species disturbance2_3_7Reduced reproductive success
Usage & commerce (1)Use & Trade — IUCNExpert
1Food - humansubsistance
Priorités de recherche (8)Research Needed Classification — IUCNExpert
1_2Population size, distribution & trends1_3Life history & ecology1_4Harvest, use & livelihoods1_5Threats1_6Actions3_1Population trends3_2Harvest level trends3_4Habitat trends
Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert
Royaumes biogéographiques
Systèmes (terrestre/eau douce/marin)
Formes de croissance
Références bibliographiques (6)Sources scientifiques de l'évaluation IUCNExpert
- IUCN. 2017. The IUCN Red List of Threatened Species. Version 2017-3. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 5 December 2017).
- BGCI. 2016. PlantSearch. London: Botanic Gardens Conservation International Available at: <a href="www.bgci.org/plant_search.php">www.bgci.org/plant_search.php</a>.
- Bachman, S., Moat, J., Hill, A.W., de la Torre, J. and Scott, B. 2011. Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool. <i>ZooKeys</i>: 117-126.
- Jeannoda, V.H., Razanamparany, J.L., Rajaonah, M.T., Monneuse, M.O., Hladik, A. and Hladik, C.M. 2007. Les ignames (<i>Dioscorea</i> spp.) de Madagascar: Espèces endémiques et formes introduites ; diversité, perception, valeur nutritionnelle et systèmes de gestion durable. <i>Rev. Écol. (Terre Vie) </i> 62: 191–207.
- Consiglio, T., Schatz, G.E., Lowry II, P.P., Rabenantoandro, J., Rogers, Z.S., Rabevohitra, R. and Rabehevitra, D. 2006. Deforestation and plant diversity of Madagascar's littoral forests. <i>Conservation Biology</i> 20(6): 1799-803.
- Burkill, I.H. and Perrier, H. 1950. Dioscoréacées. In: H. Humbert (ed.), <i>Flore de Madagascar et des Comores. Vol. 44</i>, Typographie Firmin-Didot et cie, Paris.
Évaluateurs & contributeurs (4)Personnes ayant contribué à l'évaluation IUCNExpert
Kennerley, J. A. & Wilkin, P. 2017. Dioscorea arcuatinervis. The IUCN Red List of Threatened Species 2017: e.T66769434A66769436. Accessed on 05 May 2026.
Distribution mondiale
Phénologie
Consulter sur les bases externes
Note nomenclaturale & synonymesDétails taxonomiques + synonymes CoLExpert
Note nomenclaturale
TAXREF v18 — INPN/MNHNSynonymes (3)— redirigent vers cette page
- Dioscorea heteropoda var. subdiffusaBurkill & H.Perrier
- Dioscorea humblotiiR.Knuth
- Dioscorea marekaH.Perrier
Sources : Catalogue of Life Cross-References (synonymes) · TAXREF v18 INPN/MNHN (commentaires FR).