Taxonomy

Dicksonia perriei Noben & Lehnert
endemique
protegee
UICN

Red List Status -

Vulnerable (VU) , assessed in 10/06/2017

Protected species -

in Northern Province , in Northern Province

Dicksonia perriei is an endemic tree fern of New Caledonia, trunk to 2 m tall, spread from Ignambi to Canala in the north of Grande Terre. Field observations report two more locations: Rivière Bleue and Dzumacs. It occurs in dense humid forest on ultramafic and volcano-sedimentary substrate, at an altitudinal range of 800-1,460 m asl. The main threat impacting this species comes from direct impact (consumption) caused by invasive species (rusa deer (Rusa timorensis russa) and feral pigs (Sus scrofa)), which may lead to a lack of regeneration. Its area of occupancy (AOO) and extent of occurrence (EOO) being respectively estimated to 36 and 3,856 km², while the number of locations is estimated to be ten. Dicksonia perriei is therefore assessed as Vulnerable (VU) with criteria B1ab(iii,v)+2ab(iii,v) with a decline of habitat quality and number of mature individuals.

Geographical area


Dicksonia perriei is an endemic tree fern of New Caledonia, trunk to 2 m tall, spread from Ignambi to Canala in the north of Grande Terre. Field observations report two more locations: Rivière Bleue and Dzumacs. The range of this species is insufficiently known, but it seems to be restricted to higher elevations in the northern province (Noben and Lehnert, 2013) and above the elevational range of D. thyrsopteroides.

Population


Field surveys on Mont Panié report that the species is dominant tree fern in the upper parts (L. Perrie, personal communication). Population size is unknown.

Habitat


Dicksonia perriei occurs in dense humid forest on ultramafic and volcano-sedimentary substrate at an altitudinal range of 800-1,460 m asl.

Threats


The main threat impacting this species comes from direct impact (consumption) caused by invasive species (rusa deer (Rusa timorensis russa) and feral pigs (Sus scrofa)), which may lead to a lack of regeneration.

Conservation


Dicksonia perriei is protected by legislation and occurs in two protected areas: Mont Panié and Rivière bleue. It is recommended to inform the Conservatoire d'espaces naturels de Nouvelle-Calédonie (New Caledonia natural spaces conservatory), which coordinates the New caledonian Invasive Species Programme, on the situation of the species in the concerned areas. Field surveys in Nodéla are moreover advised.

Bibliography


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.

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

Brownlie G. 1969. Flore de la Nouvelle-Calédonie et Dépendances, Volume 3: Pteridophytae.

Noben S., Lehnert M. 2013. The genus Dicksonia (Dicksoniaceae) in the western Pacific. Phytotaxa(155) , p.23-34.

Experts


Assessor(s): Amice, R., Barrabé, L., Cazé, H., Chambrey, C., Garnier, D., Hequet, V., Letocart, D., Letocart, I.

Reviewer(s): Perrie, L., Tanguy, V.

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


Geographical distribution