Taxonomy

endemique
protegee
UICN

Red List Status -

Endangered (EN) , assessed in 15/09/2016

Protected species -

in Northern Province , in Northern Province

Psychotria ianthina is an endemic shrub of New Caledonia, restricted to the northwest massif of the Grande Terre : Tiébaghi, Kaala, Taom, Ouazangou. It occurs in shrubland on ultramafic substrate at an altitudinal range 300-1,000 m asl. Main identified threat is linked to mining activities. The twenty five year projection for mining operation indicate that a majority of individuals may be affected and some sub-population might have disappeared (Tiébaghi). Its area of occupancy (AOO) and extent of occurrence (EOO) being respectively estimated to 40 and 163 km², while the number of locations are estimated to be five: Tiébaghi, Kaala, Kaala - Michel 38 (SMT), Taom, Ouazangou. Psychotria ianthina is therefore assessed as Endangered (EN) with criteria B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) with a continuing decline of all concerned sub-criteria.

Geographical area


Psychotria ianthina is an endemic shrub of New Caledonia, restricted to the northwest massif of the Grande Terre : Tiébaghi, Kaala, Taom, Ouazangou.

Population


It is known from three sub-population : Tiébaghi, Kaala, Taom, Ouazangou.

Habitat


It occurs in shrubland on ultramafic substrate at an altitudinal range 300-1,000 m asl.

Threats


Main identified threat is linked to mining activities. Some subpopulations may be threatened by mining activities : Kaala - Michel 38 (SMT), Ouazangou (NMC), Tiebaghi (SLN). The twenty five year projection for mining operation indicate that a majority of individuals may be affected. New Caledonia contains between 20 - 30% of the world’s nickel resources and has experienced intense mining activities since the late 19th century which has generated soil erosion (1.2% of bare ground mapped by SPOT5 in 2007). Based on the distribution of metal-rich soils and site accessibility, these threats are predictable and planned (rise in nickel production from 60,000 to 200,000 tonnes per year between 2013 and 2015).

Conservation


Psychotria ianthina is protected by legislation but it does not occur in any protected area. This species would benefit from ex-situ and in-situ emergency conservation actions. It is proposed to ensure the follow-up of known sub-populations, to preserve a viable population on delimited perimeters on the mining area. It would be moreover advised to realize multiplication tests in order to assist future planting operations. Prospection in Tiébaghi are urgently needed to confirm the presence of the species.

Bibliography


Morat, P.; Jaffré, T.; Tronchet, F.; Munzinger, J.; Pillon, Y.; Veillon, J.-M. and Chalopin, M. 2012. Le référentiel taxonomique Florical et les caractéristiques de la flore vasculaire indigène de la Nouvelle-Calédonie [The taxonomic database « FLORICAL » and characteristics of the indigenous flora of New Caledonia]. Adansonia sér 3(34) , p.177-219.

Barrabé L. 2013. Systématique et Evolution du genre Psychotria (Rubiaceæ) en Nouvelle-Calédonie.

Barrabé L, Maggia L, Pillon Y, Rigault F, Mouly A, Davis AP, Buerki S 2014. New Caledonian lineages of Psychotria (Rubiaceae) reveal different evolutionary histories and the largest documented plant radiation for the archipelago. Molecular Phylogenetics and Evolution(71) , p.15-35.

Endemia.nc 2016. Faune et Flore de Nouvelle-Calédonie.

Experts


Assessor(s): Barrabé, L., Amice, R., Bruy, D., Cazé, H., Dumontet, V., Fleurot, D., Garnier, D., Gâteblé, G., Hequet, V., Maura, J., McCoy, S., Suprin, B., Vandrot, H., Veillon, J.

Reviewer(s): Lannuzel, G., Tanguy, V.

Facilitator(s): Tanguy, V., Warimavute, G., Ramon, L., Maura, J.


Geographical distribution