Taxonomy

Polyscias nitida Lowry & G.M.Plunkett, ined.
endemique
protegee
UICN

Red List Status -

Critically Endangered (CR) , assessed in 09/12/2016

Protected species -

in Northern Province

Polyscias sp. nov. 'nitida' is an endemic shrub found in the central part of Grande Terre in New Caledonia. It is found in low altitude mesophilous forest on ultramafic substrates. The main threats impacting this species come from habitat degradation caused by invasive species (Rusa Deer, Rusa timorensis) and bushfires. Its extent of occurrence (EOO) and area of occupancy (AOO) are both estimated to be 12 km² while the number of location is estimated to be one as Rusa Deer might impact all the individuals. Polyscias sp. nov. 'nitida' is therefore assessed as Critically Endangered (CR) with criterion B1ab(iii) with a continuing decline of habitat quality.

Geographical area


Polyscias sp. nov. 'nitida' is an endemic shrub found in the central part of Grande Terre in New Caledonia (Téné and Saraméa; although the population at Saraméa may be extinct, and is not mapped here).

Population


Population size is unknown. This species is known from 2 subpopulations. although recent prospection efforts did not relocate the Sarraméa population and it may be extinct. This species does not seem abundant.

Habitat


It is found in low altitude (20-160 m asl) mesophilous forest on ultramafic substrate.

Threats


The main threats impacting this species come from habitat degradation caused by invasive species (Rusa Deer, Rusa timorensis) and bushfires.

Conservation


This species is not protected by legislation and it does not occur in any protected area. It is recommended to continue prospections, to carry ex-situ and in-situ conservation efforts, in particular: seeds banking, ensuring the follow-up of known sub-populations and preserving viable populations on fenced perimeters.

Bibliography


Lowry P.P.L. and Plunkett G.M. 2018. A Taxonomic revision of Polyscias subg. Tieghemopanax.

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

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): Lowry, P., Amice, R., Bruy, D., Butin, J., Cazé, H., Dumontet, V., Fleurot, D., Garnier, D., Goxe, J., Héquet, V., Lannuzel, G., McCoy, S., Schatz, G., Suprin, B., Tanguy, V., Vandrot, H., Veillon, J.

Reviewer(s): Maura, J.

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


Geographical distribution