Taxonomy

UICN

Red List Status -

Critically Endangered (CR) , assessed in 21/04/2017

Thiollierea sp.nov tiebaghi is an endemic shrub of New-Caledonia, known from Tiébaghi in Grande-Terre. It occurs in shrubland on ultramafic substrate at an altitudinal range of 300-450 m asl. Main identified threats are linked to on-going mining activities in Tiebaghi (SLN). The twenty five year projection for mining operation indicate that a majority of individuals may be affected. Its area of occupancy (AOO) and extent of occurrence (EOO) are both equal to 12 km², while the species is known to exist at only a single location. Thiollierea sp.nov tiebaghi is therefore assessed as Critically Endangered (CR) 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


Thiollierea sp.nov tiebaghi is an endemic shrub of New-Caledonia, known from Tiébaghi in Grande-Terre.

Population


Population size is unknown.

Habitat


Thiollierea sp.nov tiebaghi occurs in shrubland on ultramafic substrate at an altitudinal range of 300-450 m asl.

Threats


Main identified threats are linked to on-going mining activities in 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


Thiollierea sp.nov tiebaghi is unprotected by legislation and it does not occur in any protected area. Prospections in Tiébaghi are urgently needed. 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.

Bibliography


Barrabé L., Mouly A., Lowry II P.P. & Muzinger J. 2011. Reinstatement of the endemic New Caledonian genus Thiollierea Montrouz. (Rubiaceae) necessitated by the polyphyly of Bikkia Reinw. as currently circumscribed. Adansonia(33) , p.115-134.

Morat, P.; Jaffré, T.; Tronchet, F.; Munzinger, J.; Pillon, Y.; Veillon, J.-M. and Chalopin, M. 2012. The taxonomic database « FLORICAL » and characteristics of the indigenous flora of New Caledonia. Adansonia(334) , p.177-219.

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

Experts


Assessor(s): Barrabé, L., Amice, R., Bruy, D., Butin, J., Fleurot, D., Garnier, D., Gâteblé, G., Goxe, J., Hequet, V., Lannuzel, G., Suprin, B., Veillon, J.

Reviewer(s): Cazé, H.

Contributor(s): Mouly, A.

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


Geographical distribution