Taxonomy

endemique
UICN

Synonyms

Hibbertia virotii Guillaumin

Red List Status -

Near Threatened (NT) , assessed in 27/04/2015

Hibbertia nana is an endemic tree restricted to the southern third of the main island Grand Terre. It is found in shrubland on ultramafic substrate or outcrop of peridotite at an altitudinal range 500-1500 m asl. Its area of occupancy (AOO) and extent of occurence (EOO) are respectively 36 km² and 197 km². Old signs of fire, recent wind erosion and water stress are observed, but a continuing decline can not be highlighted. However climate change would considerably affect H.nana as there would be no more suitable habitat for H.nana. Within five known sub-populations, population size of mature individuals is unknown but it would be plausible that it ranges around 2,000 mature individuals. Using criteria D, H. nana does qualify for Near Threatened, close to Vulnerable (VU) D2.

Geographical area


Hibbertia nana is an endemic tree restricted to the southern third of the main island Grand Terre. All collections come from three sectors geographycally close : Montagne des Sources, Humboldt-Colde Ni-Kouakoué, Haute Tontouta-Combyes.

Population


Population size of mature individuals is unknown but it would be plausible that it ranges around 2,000. The regeneration observed is quite low, but seems normal for altimontane shrubland species.

Habitat


It is found in shrubland on ultramafic substrate or outcrop of peridotite an altitudinal range 700-1500 m asl.

Threats


Some old signs of fire are recorded without direct impact on H. nana. The main threats to H.nana are linked to climate change and its consequences on wind erosion and pluviometry. Climate change would considerably affect H.nana as there would be no more suitable habitat for H.nana.

Conservation


H.nana is not protected by legislation but occurs in three protected areas : réserve naturelle du Mont Humboldt, réserve intégrale de la Montagne des Sources and réserve naturelle du massif du Kouakoué.

Bibliography


Veillon J.-M.; Müller I.H.; Goldblatt P. 1990. Flore de la Nouvelle-Calédonie et dépendances. Volume 16 : Dilléniacées, Goodéniacées, Iridacées, Campynématacées.

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

Gomez C.; Mangeas M.; Curt T.; Ibanez T.; Munzinger J.; Dumas P.; Jérémy A.; Despinoy M. and Hély C. 2014. Wildfire risk for main vegetation units in a biodiversity hotspot: modeling approach in New Caledonia, South Pacific. Ecology and Evolution(5) , p.377-390.

Morat, P.; Jaffré, T.; Tronchet, F.; Munzinger, J.; Pillon, Y.; Veillon, J.-M. and Chalopin, M. 2012. The taxonomic database « FLORICAL » and characteristics of the indigenous flora of New Caledonia. Adansonia(334) , p.177-219.

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

Experts


Assessor(s): Veillon, J., Amice, R., Butin, J., Cazé, H., Garnier, D., Lannuzel, G., Leborgne, T., McCoy, S.

Reviewer(s): Tanguy, V.

Facilitator(s): Chanfreau, S.


Geographical distribution