Grevillea deplanchei, commonly known as "Rince-bouteille de rivière", is a riparian species endemic from New Caledonia. It is restricted to the southern massif (massif du Grand Sud) of the main land (Grande Terre), from its southern part at Rivière des Pirogues to its upper limit area at Tontouta-Thio. This species occurs in scrublands along river banks on ultramafic and serpentinite substrates up to 900 m asl. It is threatened by the change of river flow due to gravel deposits, an indirect threats from the mining activity at Tontouta and soil erosion from uncontrolled bushfires. It is also threatened by human activities (logging of the species for barbecues, over-stamping) that contribute to the degradation and loss of the habitat and the decline of the species (prevent regeneration of the species). Grevillea deplanchei can remain locally abundant in some stations but it is not a common species. Its extent of occurrence (EOO) and area of occupancy (AOO) are estimated to be of 1,519 km² and 108 km² with an estimation of eight locations. Grevillea deplanchei is therefore assessed as Vulnerable (VU) with criteria B1ab(ii,iii,v)+2ab (ii,iii,v) with a continuing decline of all the concerned criteria.

Geographical area

Grevillea deplanchei is endemic to New Caledonia where it is restricted to the southern massif (massif du Grand Sud) of the main land (Grande Terre), from its southern part at Rivière des Pirogues to its upper limit area at Tontouta-Thio.

Population

Grevillea deplanchei can remain locally abundant in some stations but it is not a common species.

Habitat

This species occurs in scrublands along river banks on ultramafic and serpentinite substrates up to 900 m asl.

Threats

This species is threatened by the change of river flow due to gravel deposits, an indirect threats from the mining activity at Tontouta and soil erosion from uncontrolled bushfires. It is also threatened by human activities (logging of the species for barbecues, over-stamping) that contribute to the degradation and loss of the habitat and the decline of the species (prevent regeneration of the species).

Conservation

Grevillea deplanchei is not protected by legislation in New Caledonia but it does occur in four protected areas : Haute Dumbéa, la Dumbéa, Montagne des sources, Rivière bleue.

Bibliography

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.

Virot, R. 1968. Flore de la Nouvelle Calédonie et dépendances. Volume 02 : Protéacées.

Munzinger J., Morat Ph., Jaffré T., Gâteblé G., Pillon Y., Rouhan G., Bruy, D., Veillon J.-M., & M. Chalopin 2020. FLORICAL: Checklist of the vascular indigenous flora of New Caledonia [continuously updated].

Pauline Majourau, Yohan Pillon. 2020. A review of Grevillea (Proteaceae) from New Caledonia with the description of two new species.. Phytotaxa(477) , p.243-252.

Experts

Assessor(s): Amice, R., Bruy, D., Cazé, H., Fleurot, D., Gâteblé, G., Lannuzel, G., Laudereau, C., Vandrot, H., Pillon, Y.

Reviewer(s): Eltabet, N.

Facilitator(s): Warimavute, G., Meyer, S.