Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Pinopsida Pinales Araucariaceae

Scientific Name: Araucaria humboldtensis
Species Authority: J.Buchholz
Taxonomic Source(s): Farjon, A. 2010. A Handbook of the World's Conifers. Koninklijke Brill, Leiden.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,ii,iii,v)+2ab(i,ii,iii,v) ver 3.1
Year Published: 2010
Date Assessed: 2009-11-03
Assessor(s): Thomas, P.
Reviewer(s): Farjon, A. & Gardner, M.
Contributor(s): Munzinger, J., Jaffré, T. & Lowry, P.
Previously this species had been regarded as Lower Risk/conservation dependent due to its restricted distribution and narrow ecological niche and the fact that it was largely confined to protected areas. Field work over the last decade has indicated that this species should now be regarded as Endangered on the basis of a decline in the quality of habitat due to an increased frequency of fires and die back in some subpopulations.
Previously published Red List assessments:
1998 Lower Risk/conservation dependent (LR/cd)
1998 Vulnerable (V)

Geographic Range [top]

Range Description: This species is only known from the highest parts of four mountains in the southern massif  - Mt Humboldt , Mt Kouakoué, Montagne des Sources and Mont Mou. A potential fifth area (Mamie) at much lower elevation has not been confirmed. Occurs from 750 to 1,600 m.
Countries occurrence:
New Caledonia
Estimated area of occupancy (AOO) - km2: 12
Continuing decline in area of occupancy (AOO): Yes
Extreme fluctuations in area of occupancy (AOO): No
Estimated extent of occurrence (EOO) - km2: 219
Continuing decline in extent of occurrence (EOO): Yes
Extreme fluctuations in extent of occurrence (EOO): No
Number of Locations: 4
Continuing decline in number of locations: No
Extreme fluctuations in the number of locations: No
Lower elevation limit (metres): 750
Upper elevation limit (metres): 1600
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Subpopulations on the summits and ridges of Mt Humboldt, Mt Kouakoué and Montagne des Sources are quite extensive although there has been significant die back over the last decade at Mt Humboldt. The subpopulation at Mt Mou is much smaller and more degraded. At Mamie, in an area that represents an atypical habitat at an altitude of 400-500 m asl, a relatively extensive and healthy subpopulation has recently been tentatively identified as A. humboldtensis.
Current Population Trend: Decreasing
Additional data:
Number of mature individuals: 9999 Continuing decline of mature individuals: Yes
Extreme fluctuations: No Population severely fragmented: Yes

Habitat and Ecology [top]

Habitat and Ecology: Restricted to the highest ridges and summits on ultramafic soils.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes

Threats [top]

Major Threat(s): Recent die back may have caused the death of at least 10% of the Mt Humboldt subpopulation. The cause is unknown but may relate to drought induced stress or perhaps an unknown pathogen. Wildfires are currently the main threat. As subpopulations are restricted to a narrow altitudinal range with little possibility for upward expansion, this species may be very susceptible to some of the potential impacts of climate change.

Conservation Actions [top]

Conservation Actions: The main subpopulations are within protected areas such as Montagne des Sources and Mont Humboldt although it should be noted that some reserves are open to mining. Fire prevention measures are in place with fire brigades and water-bombing helicopters available if needed.

Citation: Thomas, P. 2010. Araucaria humboldtensis. The IUCN Red List of Threatened Species 2010: e.T30983A9587189. . Downloaded on 07 October 2015.
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