Taxonomy

endemique
protegee
UICN

Red List Status -

Vulnerable (VU) , assessed in 17/11/2017

Protected species -

in Southern Province , in Northern Province

Tristaniopsis lucida is an endemic tree from New Caledonia, where it is only known from the Rivière Bleue area, in the south of Grande Terre. This species occurs in low-elevation dense humid forest on ultramafic substrate between 200 and 250 m asl. Known from 2 locations, its extent of occurrence (EOO) and area of occupancy (AOO) are both 12 km². It is not directly threatened at the moment, but it could be heavily impacted by myrtle rust (Austropuccinia psidii) in the future, since it has a very limited geographical range. Therefore, T. lucida is listed as Vulnerable (VU) under criteria D1+2.

Geographical area


T. lucida is endemic to New Caledonia, where it is only known from the Rivière Bleue area, in the south of Grande Terre.

Population


Two subpopulations are known, on both sides of Rivière Bleue. Total population size is unknown, but is estimated to be more than 250 mature individuals. It seems to be stable at the moment, but no regeneration has been observed in the field.

Habitat


T. lucida occurs in low-elevation dense humid forest on ultramafic substrate between 200 and 250 m asl.

Threats


This species was formerly threatened by kauri exploitation in the 1970s, which contributed to severe habitat degradation. Besides, having a very limited geographical range, it could also be heavily impacted by myrtle rust (Austropuccinia psidii) in the future. This pathogen has been observed at the entrance of the Rivière Bleue park, so the species should be closely monitored in that regard.

Conservation


T. lucida is protected by legislation in province Nord and it occurs in two protected areas: Haute Yaté and Parc de la Rivière Bleue. A few individuals of this species are cultivated at the IAC (Institut Agronomique de Nouvelle-Calédonie) nursery at Saint-Louis. However, myrtle rust (Austropuccinia psidii) infections have been observed on cultivated plants, so close monitoring should occur in the Rivière Bleue park, where the pathogen has also been observed. This species would benefit from in situ and ex situ emergency conservation actions. To ensure the preservation of a viable population, it is recommended to regulate invasive species and to raise awareness on this species amongst local stakeholders. Moreover, it is suggested to promote further growing in nurseries and its use in green space planning.

Bibliography


Dawson J.W. 1992. Flore de la Nouvelle-Calédonie et dépendances. Volume 18 : Myrtacées Leptospermoïdées.

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

Experts


Assessor(s): Amice, R., Butin, J., Fleurot, D., Garnier, D., Goxe, J., Héquet, V., Lannuzel, G., Suprin, B., Veillon, J.

Reviewer(s): Vandrot, H.

Contributor(s): Lespes, A., Manauté, J.

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


Geographical distribution