Albizia guillainii 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Fabales Fabaceae

Scientific Name: Albizia guillainii Guillaumin

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2ce; B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2010
Date Assessed: 2007-05-15
Needs updating
Assessor(s): Hequet, V.
Reviewer(s): Pollock, C.M. & Hilton-Taylor, C.
Albizzia guillainii has an area of occupancy (AOO) of 44 km² of and an extent of occurrence (EOO) of 3,474 km². The species is endemic to New Caledonian dry forests (including on calcareous substrates) and its habitat is among the most threatened in the country. Dry forests have been reduced dramatically, both in size and in quality. They have been intensively cut for agricultural purposes over the last century and what remains today are highly fragmented patches. A. guillainii suffers intense predation by the introduced Rusa Deer (Cervus timorensis russa) and little regeneration has been observed. The reduction of its habitat has been estimated at 95% over the last 150 years (Bouchet 1995). From this it is suspected that a population reduction of at least 30% has occurred over this time period; the actual generation length for this species is not known, but with evidence of dramatic declines in dry forest habitat over the last 150 years it is likely that there has been a population reduction of at least 30% over the last three generations.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is endemic to New Caledonia. It must once have been common all along west coast, however today it is recorded from Noumea, Paita, Bourail, Pouembout and Koumac with gaps in the distribution as large as 125 and 92 km. Its total extent of occurrence is 3,474 km², and its estimated area of occupancy within this range is 44 km².
Countries occurrence:
New Caledonia
Additional data:
Estimated area of occupancy (AOO) - km2:44
Number of Locations:9
Upper elevation limit (metres):300
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The population size is unknown. When present, this species is never abundant and typically appears as scattered individuals. Little regeneration is observed for this species.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species is endemic to New Caledonian dry forests (including on calcareous substrate). 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.
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 (Cervus timorensis russa), 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.

Conservation Actions [top]

Conservation Actions: This species is present in three protected areas.

Citation: Hequet, V. 2010. Albizia guillainii. The IUCN Red List of Threatened Species 2010: e.T35026A9906081. . Downloaded on 22 July 2018.
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