Taxonomy

Hibbertia rubescens Vieill. ex Guillaumin
endemique
protegee
UICN

Red List Status -

Vulnerable (VU) , assessed in 27/04/2015

Protected species -

in Northern Province

H.rubescens is an endemic tree of New Caledonia restricted to a shrubland located on the slopes of Massif Taom. It precisely occurs at an altitudinal range 200-700 m asl. Population size reduction cannot be assessed because of a lack of data but it would be plausible that it ranges over 1,000. A geographical barriers between Ouazangou and Taom seems to preserve H.rubescens from mining activity located on near massif. However, monitoring of the situation (impact of mine's reopening anf bushfire ) is highly recommended as this microendemic species is Vulnerable (VU D2) because of its tiny area of occupancy (AOO).

Geographical area


H.rubescens is an endemic tree of New Caledonia restricted to a shrubland located on the slopes of Massif Taom.

Population


Population size is estimated higher than 1,000 mature individuals.

Habitat


It occurs on shrubland, mostly dominated by Gymnostoma chamaecyparis on altered peridotite at an altitudinal range 200-700 m asl.

Threats


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). They contribute to habitat fragmentation and decline in the quality of habitat. Some fire observed on west downward slope of Mount Taom may affect H. rubescens. However, reopening mining activities remains the main threat. Planned exploitation for nickel, on the ultramafic massif Mont Taom will very likely result in a decline in the extent and quality of habitat and decline of mature individuals in the foreseeable future. Monitoring of the situation is highly recommended as this microendemic species is Vulnerable (VU D2) because of its tiny area of occupancy (AOO).

Conservation


H. rubescens is protected by legislation in Province Nord. It does not occur in any protected areas. To avoid any risks of fire, it is recommended to inform the department of civil defense that H. rubescens is present on Mont Taom. It would also be benefical to put under protection a part of its habitat.

Bibliography


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

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

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.

Hély-Alleaume 2012. INC : Incendies et biodiversité des éco-systèmes en Nouvelle-Calédonie.

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.

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