Taxonomy

Scaevola barrierei A.S.Wulff & Munzinger
endemique
protegee
UICN

Red List Status -

Critically Endangered (CR) , assessed in 12/10/2015

Protected species -

in Southern Province

Scaevola barrierei is a shrub endemic to the north-western part of Grande Terre in New Caledonia (Kopéto, Boulinda). The main threat is ongoing mining activities in Kopéto and potentially future mining projects at Boulinda. The species has an extent of occurrence (EOO) of 20 km² and an area of occupancy (AOO) of 12 km². Population size is estimated to be fewer than 100 mature individuals. As a result of the ongoing mining activities on Kopéto, a continuing decline is predicted. Based on criterion C, S. barrierei qualifies for listing as Critically Endangered (CR) C2a(i).

Geographical area


Scaevola barrierei is a shrub endemic to the north-western part of Grande Terre in New Caledonia (Kopéto, Boulinda).

Population


Population size is estimated to be fewer than 100 mature individuals, and both subpopulations are thought to number fewer than 50 individuals. Furthermore, the twenty five years projection for mining operations indicates a reduction of population size may occur.

Habitat


Scaevola barrierei is found in shrubland on an ultramafic substrate at an altitudinal range of 780-900 m asl.

Threats


The main threat is presented by ongoing mining activities in Kopéto and potentially future mining projects at Boulinda. New Caledonia contains 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 (there was a rise in nickel production from 60,000 to 200,000 tonnes per year between 2013 and 2015).

Conservation


Scaevola barrierei is not protected by legisaltion in Province Nord. It does not occur in any protected area. Through a partnership in 2015 with IAC (Institut Agronomique néo-Calédonien) and SLN (Société le Nickel), technical guidelines were drawn up, and propagation tests were conducted. This species would benefit from ex-situ and in-situ emergency conservation actions. It is proposed to conduct propagation tests in order to assist future planting operations and the monitoring of the only known population, to better estimate population size and to preserve a viable population within delimited perimeters on Kopéto.

Bibliography


Wulff AS, Hollingsworth PM, Ahrends A, Jaffré T, Veillon J-M, L’Huillier L, et al. 2013. Conservation Priorities in a Biodiversity Hotspot: Analysis of Narrow Endemic Plant Species in New Caledonia.

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

L'Huillier L.; Jaffré T. and Wulff A. 2010. Mines et Environnement en Nouvelle-Calédonie : les milieux sur substrats ultramafiques et leur restauration.

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.

Experts


Assessor(s): Tanguy, V., Veillon, J., Amice, R., Barrière, R., Chambrey, C., Fleurot, D., Lannuzel, G.

Reviewer(s): Vandrot, H.

Contributor(s): Wulff, A.

Facilitator(s): Tanguy, V., Chanfreau, S.


Geographical distribution