Pittosporum tanianum 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Apiales Pittosporaceae

Scientific Name: Pittosporum tanianum Veillon & Tirel
Taxonomic Source(s): Tirel, Ch. and Veillon, J.-M. 2002. Flore de la Nouvelle-Calédonie, tome 24. Pittosporaceae. Museum d'Histoire Naturelle, Paris.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii,v)+2ab(iii,v); C2a(i); D ver 3.1
Year Published: 2017
Date Assessed: 2015-07-24
Assessor(s): Gemmill, C., Veillon, J.-M., Amice, R., Cazé, H., Dumontet, V., Fleurot, D., Garnier, D., Gâteblé, G., Letocart, I., Letocart, D., Maggia, L. & Pain, A.
Reviewer(s): Tanguy, V.
Contributor(s): Plouzennec, P. & Suprin, B.
Facilitator/Compiler(s): Chanfreau, S.
Pittosporum tanianum is an endemic shrub of New Caledonia known exclusively on île Léprédour, located on the west coast of Grande Terre. Epithet tanianum is coming from the name Tani corresponding at île Leprédour in Kanak language. Strongly threatened by invasive species, population of P. tanianum is only composed by 2 individuals. Under pressure of rusa deer (Rusa timorensis) and feral rabbit, a continuous decline of number of individuals and habitat quality is observed. This species was the object of numerous conservation plans, which fail to contain the decline of individual numbers. Using criteria B, C and D, P. tanianum qualifies as Critically Endangered (CR) B1ab(iii,v)+2ab(iii,v);C2a(i);D.
Previously published Red List assessments:

Geographic Range [top]

Range Description:Pittosporum tanianum is an endemic tree of New Caledonia exclusively known on île Léprédour, located on west coast of Grande Terre.
Countries occurrence:
New Caledonia
Additional data:
Estimated area of occupancy (AOO) - km2:8Continuing decline in area of occupancy (AOO):No
Extreme fluctuations in area of occupancy (AOO):NoEstimated extent of occurrence (EOO) - km2:8
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:1Continuing decline in number of locations:No
Extreme fluctuations in the number of locations:NoLower elevation limit (metres):80
Upper elevation limit (metres):150
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:From current field observations, only one male and one female individual remain of the natural population on îlot Leprédour. For in situ plantations done by CEN, only 50% of the planted individuals remain and none are yet mature. Concerning the ex situ population located in parc zoologique et forestier, there is no evidence of mortality.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:2Continuing decline of mature individuals:Yes
Extreme fluctuations:NoPopulation severely fragmented:No
No. of subpopulations:1
Extreme fluctuations in subpopulations:NoAll individuals in one subpopulation:Yes

Habitat and Ecology [top]

Habitat and Ecology:Pittosporum tanianum occurs in low-altitude strongly damaged sclerophyllous forest on calcareous soils.
Continuing decline in area, extent and/or quality of habitat:Yes
Generation Length (years):0

Threats [top]

Major Threat(s): Pittosporum tanianum is severely threatened by invasive animal species. Introduced in the 1880s, Rusa Deer (Rusa timorensis) and at the end of 1970s European Rabbit, these two species are the cause of severe damage to the environment resulting in erosion as well as loss of mature individuals and lack of seedling regeneration.

Conservation Actions [top]

Conservation Actions: Protected species by legislation in Province Nord and Province Sud, two natural mature individuals remain in réserve naturelle de l’Ile Leprédour. Ex situ propagation in a nursery needs to be maintained going and population control of invasive species inside the protected area is being organized. Of 300 plants produced as a part of conservation of Pittosporum tanianum, 100 plants have been planted on île Leprédour and 100 plants in parc zoologique et forestier. The Parc zoologique population shows good results while the in situ plantation recorded 50% of mortality. The first generation was grown from germination of seed. The next generations were propagated from cuttings. On intra-genus crossings tried, only crossing with P. coccineum and P. croceum worked well. The urgent situation of P. tanianum justifies extending surveys to nearby areas where vegetation is similar, such as presqu'île Montagnès, Perceval, îlot Moro and îlot Page.

Citation: Gemmill, C., Veillon, J.-M., Amice, R., Cazé, H., Dumontet, V., Fleurot, D., Garnier, D., Gâteblé, G., Letocart, I., Letocart, D., Maggia, L. & Pain, A. 2017. Pittosporum tanianum. The IUCN Red List of Threatened Species 2017: e.T35030A67747859. . Downloaded on 18 September 2018.
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