|Scientific Name:||Podonephelium subaequilaterum Radlk.|
|Taxonomic Source(s):||Munzinger, J., Lowry II, P.P., Callmander, M.W. and Buerki, S. 2013. A Taxonomic Revision of the Endemic New Caledonian Genus Podonephelium Baill. (Sapindaceae). Systematic Botany 38(4): 1105-1124.|
|Red List Category & Criteria:||Critically Endangered B1ab(i,ii,iii,iv,v) ver 3.1|
|Contributor(s):||Munzinger, J., Cazé, H., Isnard, S., McCoy, S. & Wulff, A.|
Podonephelium subaequilaterum is an endemic tree of New Caledonia occurring in sclerophyllous forest.
This species has suffered from sclerophyllous forest reduction and fragmentation. This is particularly linked to agriculture on the west coast.
Today, the main threat to Podonephelium subaequilaterum comes from habitat degradation due to Rusa Deer (Rusa timorensis) and uncontrolled fires.
|Range Description:||Podonephelium subaequilaterum is an endemic tree of New Caledonia restricted to the west coast of Grande Terre. Is is only known from the area in the vicinity of La Foa, in southwestern Grande Terre.|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||Population size is unknown. The subpopulation in Ouaménie has been highly impacted by introduced deer. We were able to locate more than 10 individuals, but regeneration has clearly been impeded (the smallest tree seen had a DBH of 7.5 cm and no seedlings or saplings were seen).|
|Current Population Trend:||Decreasing|
|Habitat and Ecology:||Podonephelium subaequilaterum grows only in sclerophyllous and mesic forest on volcano-sedimentary substrates at low elevation (100–500 m).|
Sclerophyllous forests in New Caledonia are the most heavily impacted native vegetation type in New Caledonia, of which just 1–2% of the original cover remained as of the mid-1990s (Bouchet et al. 1995) and even less today. Because of their propensity to become pastures and their susceptibility to fire, dry forests have reduced dramatically, in size as well as in quality. In New Caledonia, they have been extensively cleared for agricultural purposes for a century; what remains today are highly fragmented patches.
|Continuing decline in area, extent and/or quality of habitat:||Yes|
Tropical dry forests are probably among the world's most endangered of all lowland tropical forests. Because of their propensity to become pastures and their susceptibility to fire, dry forests have reduced dramatically, in size as well as in quality. In New Caledonia, they've been extensively cleared for agricultural purposes or urbanization for a century; what remains today are highly fragmented patches that have been estimated at 2% of the original area.
Today's main threat to Podonephelium subaequilaterum comes from Rusa Deer (Rusa timorensis), which was introduced in the 1880s and adapted extremely well to Caledonian habitats. Its population may have reached over 100,000 individuals in the wild. This deer consumes a wide variety of plant species and causes severe damage to trees and very little regeneration.
Uncontrolled fires sweep across lowlands of 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 have slowly transformed remnant patches of dry forest into scrubland dominated by Acacia spirorbis and Leucaena leucocephala.
Podonephelium subaequilaterum is not protected by local legislation. None of the subpopulations occur within a protected area while dry forests benefit from a conservation programme managed by the Conservatoire des Espaces Naturels.
Dry forests are a patrimonial ecosystem protected by the Code de l'Environnement of the Province Sud.
This species would benefit from in-situ and ex-situ emergency conservation actions.
|Errata reason:||This errata assessment has been created because the map was accidentally left out of the version published previously.|
|Citation:||Tanguy, V. 2015. Podonephelium subaequilaterum (errata version published in 2016). The IUCN Red List of Threatened Species 2015: e.T75088624A105179734.Downloaded on 22 July 2018.|
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