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Psychotria deverdiana 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Rubiales Rubiaceae

Scientific Name: Psychotria deverdiana Guillaumin
Taxonomic Source(s): Barrabé, L., Mouly, A. and Florence, J. 2013. Psychotriae (Rubiaceae) neocaledonicarum specierum nomenclator. Adansonia 35(2): 281-357.
Taxonomic Notes: The genus Psychotria hosts nearly a hundred species and it hasn't been revised since 1950. It is necessary to examine and resolve the taxonomy of this genus.

Assessment Information [top]

Red List Category & Criteria: Vulnerable 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:
Psychotria deverdiana has an extent of occurrence (EOO) of 2,143 km2 and an area of occupancy (AOO) of 24 km2. The species is endemic to New Caledonia, where it can be found in dry forests and in formations on ultramafic soils. Dry forests in New Caledonia 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 fragmented patches that suffer intense predation by the introduced Rusa Deer (Rusa timorensis) and uncontrolled fires. The reduction of this habitat has been estimated at 95% over the last 150 years (Bouchet 1995) and this degradation continues today. Formations on ultramafic soils are threatened because of their mining value, they also have been reduced a lot during the last century. The subpopulation on Koniambo mountain is under threat from a large nickel plant project.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to New Caledonia, where it is present on the west coast in Tontouta (Uitoe and Montagnes), Pindaï, Poya (Ile Grimault), Koné (Koniambo) and Gomen (Cap Deverd). Distances between sites are (respectively and from south to north) 145, 38 and 55 km. Its total extent of occurrence is 2,143 km2, and its estimated area of occupancy within this range is 24 km2.
Countries occurrence:
Native:
New Caledonia
Additional data:
Estimated area of occupancy (AOO) - km2:24
Number of Locations:6-10
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Population size is unknown. When present, this species can be locally common in the understorey (Pindai), but mostly it is rare.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is present in dry forests (including calcareous forests) and on ultramafic soils. 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. Formations on ultramafic soils have also been very impacted by mining activities and fires in New Caledonia.
Systems:Terrestrial
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s): The major threat is lowland clearing for cattle grazing and agriculture, which began in the 1850s and is ongoing. Another threat comes from the Rusa Deer (Rusa timorensis), which was introduced in the 1880s and adapted extremely well to the Caledonian habitats. Its population may have reached 105,000–110,000 individuals in the wild. This deer consumes a wide variety of plant species and also causes severe damage to trees by rubbing antlers against tree stems. The third major threat is uncontrolled fires that sweep across lowlands of New Caledonia each year during the dry season and have slowly transformed remnant patches of dry forest into shrubland dominated by Acacia spirorbis and Leucaena leucocephala, or Niaouli (Melaleuca quinquenervia) savannas. The Koniambo subpopulation is threatened by nickel industry projects on this mountain.

Conservation Actions [top]

Conservation Actions: This species is not present in any protected areas.

Citation: Hequet, V. 2010. Psychotria deverdiana. The IUCN Red List of Threatened Species 2010: e.T35294A9919605. . Downloaded on 21 November 2017.
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