|Scientific Name:||Pseudotsuga japonica|
|Species Authority:||(Shiras.) Beissn.|
Tsuga japonica Shiras.
|Red List Category & Criteria:||Endangered C2a(i) ver 3.1|
|Assessor/s:||Katsuki, T., Luscombe, D & Farjon, A.|
|Reviewer/s:||Thomas, P. & Yahara, T.|
This is a very rare species, with only small and scattered subpopulations of very slow growing trees. The total population is not larger than 2,500 trees, there are no subpopulations exceeding 250 mature trees and there is a continuing decline. On this basis it qualifies for Endangered under the C criterion.
|Range Description:||Japan: W Honshu (Chugoku District), Shikoku. E H. Wilson (1916) reported it as very rare in Kyushu, but its occurrence there has not been confirmed later.|
|Range Map:||Click here to open the map viewer and explore range.|
|Population:||The population is declining (T. Yahara pers. comm)|
|Habitat and Ecology:||Pseudotsuga japonica occurs at elevations between 500 m and 650 m a.s.l. on Shikoku; Wilson (1916) reports it from about 1,000 m on the same island. It is rare and scattered in sheltered valleys and steep ravines, growing on old volcanic rock. The climate is warm temperate, moist, with annual precipitation between 1,000 and 2,000 mm. It is locally a (major) constituent of mixed conifer-broad-leaved forests, with Tsuga sieboldii usually as the dominant species. Other conifers are Abies firma, Chamaecyparis obtusa, Torreya nucifera and Cryptomeria japonica, broad-leaved trees are e.g. Quercus salicina, Q. sessilifolia, Cleyera japonica, and Illicium religiosum (small tree), common shrubs are Eurya japonica, Pieris japonica, Rhododendron serpyllifolium, and Thea japonica. As in China, in Japan the genus, represented by a single species, is a minor constituent of mixed forests|
|Major Threat(s):||The main threat has been the conversion of habitat to plantation forestry and other uses. Regeneration is poor and older trees are declining. The total population of this species in Japan is estimated to be ca. 2,000 mature trees and is considered to be continuously declining.|
|Conservation Actions:||The species is known from at least one protected area.|
|Citation:||Katsuki, T., Luscombe, D & Farjon, A. 2013. Pseudotsuga japonica. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 10 December 2013.|
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