Red List Status -Critically Endangered (CR) , assessed in 12/10/2015
Protected species -in Northern Province , in Northern Province
Soulamea rigaultii is a narrow endemic small tree found in the northwestern part of Grande Terre in New Caledonia. This species is only known from a single population : Boulinda. It is found in riparian forest on an ultramafic substrate at an altitudinal range 20-300 m asl. Degradation of habitats induced by uncontrolled bushfires support a continuous decline of its area of occupancy, extent of occurrence, quality of habitat, number of location and number of mature individuals. Using criteria B, Soulamea rigaultii qualifies as Critically Endangered (CR) B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v);
Soulamea rigaultii is a narrow endemic small tree found in the northwestern part of Grande Terre in New Caledonia. This species is only known from a single population : Boulinda.
Population size is unknown but it seems to form a quite dense sub-population.
Soulamea rigaultii is found in riparian forest on an ultramafic substrate at an altitudinal range 20-300 m asl.
Main identified threat is linked to habitat damage by uncontrolled bushfires. 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. Roads opening due to mining activities is an additonal threat.
Soulamea rigaultii is protected by legislation in Province Nord, but 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 Boulinda. It would be moreover advised to prospect nearby valleys (such as Mounio rive droite).
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.
Endemia.nc 2016. Faune et Flore de Nouvelle-Calédonie.
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.
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.