Taxonomy

endemique
protegee
UICN

Red List Status -

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

Protected species -

in Northern Province

Thiollierea laureana is an endemic shrub of New Caledonia, known from massif de Poum in Grande Terre. It occurs in shrubland on ultramafic substrate at an altitudinal range of 50-400 m asl. The main impact identified comes from ongoing mining activites and bushfires. Its area of occupancy (AOO) and extent of occurrence (EOO) are both equal to 16 km², while the species is known to exist only at a single location. Thiollierea laureana is therefore assessed as Critically Endangered (CR) with criteria B1ab(i,ii,iii,iv,v) with a continuing decline of all concerned sub-criteria.

Geographical area


Thiollierea laureana is an endemic shrub of New Caledonia, known from massif de Poum in Grande Terre.

Population


Population size is unknown.

Habitat


Thiollierea laureana occurs in shrubland on ultramafic substrate at an altitudinal range of 50-400 m asl.

Threats


The main impact identified comes from ongoing mining activites: Poum (SLN) and bushfires. 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). Uncontrolled bushfires sweep across New Caledonia each year, especially during the dry season (an average of 20,000 ha of land is burnt each year, with dramatic peaks of 70,000 ha). Lowest parts of ultramafic areas are particularly exposed to such risk.

Conservation


Thiollierea laureana is unprotected by legislation and 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. It is recommended to inform the DSCGR (emergency services) on the presence of the species in the concerned areas.

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.

Mouly A. 2016. Une nouvelle espèce de Thiollierea Montrouz. (Rubiaceae), micro-endémique du massif minier de Poum (Nouvelle-Calédonie).. Candollea(71) , p.99-104.

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.

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): Tanguy, V., Maura, J., Warimavute, G.


Geographical distribution