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Trigonostemon cherrieri

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA MAGNOLIOPSIDA EUPHORBIALES EUPHORBIACEAE

Scientific Name: Trigonostemon cherrieri
Species Authority: Veillon

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2010
Date Assessed: 2007-05-15
Assessor(s): Hequet, V.
Reviewer(s): Pollock, C.M. & Hilton-Taylor, C.
Justification:
Trigonostemon cherrieri is endemic to New Caledonia, and it is the only representative of its genus there. It is a dioecious species endemic to a single dry forest. Its extent of occurrence (EOO) and area of occupancy (AOO) are both 0.36 km². Its habitat is among the most threatened of New Caledonia. Dry forests have been reduced dramatically, both in size and quality. They have been intensively cut for agricultural purposes over the last century and what remains today are highly fragmented patches that suffer predation by cattle, introduced Rusa Deer (Cervus timorensis russa) and uncontrolled fires. The reduction of the habitat has been estimated at 95% over the last 150 years (Bouchet 1995) and degradation continues today. Half of the T. cherrieri population is located within a fenced reserve area, but the other half is not protected and is still impacted by grazing and trampling of cattle, deer and pigs. It is estimated that with this continuing threat, the species is likely to undergo a population reduction of at least 50% over the next 100 years.
History:
1998 Critically Endangered (Oldfield et al. 1998)
1998 Critically Endangered
1997 Endangered (Walter and Gillett 1998)

Geographic Range [top]

Range Description: This species is endemic to New Caledonia where it is known from a single location in Poya. The area is a small (36 ha) private residual dry forest surrounded by pastures, and it has been partly fenced (14 ha) for protection against cattle, deer and wild pigs. Its total extent of occurrence and area of occupancy are 0.36 km².
Countries:
Native:
New Caledonia
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: In its unique locality of occurrence, this species is common and the population of adult trees may be of more than a hundred individuals, homogeneously distributed over the forest.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This species is endemic to New Caledonian dry forests. 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 intensively cut for agricultural purposes for a century; what remains today are highly fragmented patches that have been estimated at 2% of the original area.
Systems: Terrestrial

Threats [top]

Major Threat(s): The population was split into two when the reserve was fenced. The population located inside the fence is vigorous and regenerates well. The other population, located outside the reserve, is still impacted by grazing and trampling by cattle, wild deer and pigs.

Conservation Actions [top]

Conservation Actions: This species is located on a private land. The Programme de Conservation des Forêts Sèches de Nouvelle Calédonie (PCFS) has financed a fence to prevent cattle, wild deer and pigs to come in, thus providing a safer environment for this and other species. A restoration program is underway with 2,500 individual trees planned to be planted in 2007 inside the fenced area in order to help natural regeneration colonizing all the open areas of this degraded patch.

Citation: Hequet, V. 2010. Trigonostemon cherrieri. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 22 October 2014.
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