Cycas taitungensis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Cycadopsida Cycadales Cycadaceae

Scientific Name: Cycas taitungensis C.F.Shen, K.D.Hill, C.H.Tsou & C.J.Chen

Assessment Information [top]

Red List Category & Criteria: Endangered A4ce; B1ab(v) ver 3.1
Year Published: 2010
Date Assessed: 2009-10-31
Assessor(s): Haynes, J.
Reviewer(s): Donaldson, J.S. & Bösenberg, J.D.
Invasion by Aulacaspis scale has started to cause decline. If this follows the same pattern as elsewhere (e.g. Guam), mortality of > 50% is expected within at least one generation. Even if the decline is less, it also qualifies as Endangered under criterion B1, because the extent of occurrence is 65 km², the species is known from two locations and there is continuing decline in mature individuals.
Previously published Red List assessments:

Geographic Range [top]

Range Description:This species is known only from the mountainous southern parts of Taitung (Taidong) province of Taiwan. Populations are in the Lu-Yeh Valley near Yenping Hsiang and to the west of the Taitung Coastal Range in Tunghe Hsiang. Occurs from 400 to 900 m asl.
Countries occurrence:
Taiwan, Province of China
Additional data:
Number of Locations:2
Lower elevation limit (metres):400
Upper elevation limit (metres):900
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:C. taitungensis occurs at two locations. Genetic studies show low levels of differentiation between these subpopulations. At least 1,700 plants occur in the Taitung Hongyeh Village Cycas Nature Reserve.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:10000
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species occurs in mixed, sparse forests in exposed sites on rocky and steep slopes or in well-drained gravel. The habitat is subjected to periodic fires.
Generation Length (years):40

Threats [top]

Major Threat(s): The invasive Cycas Aulacaspis scale is present in the Taitung Hungyeh Village Cycas Nature Reserve. Poaching of plants and seed from habitat plants also poses a threat to this species.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix II of the CITES Appendices. Plants are protected in the Taitung Hongyeh Village Cycas Nature Reserve.

Citation: Haynes, J. 2010. Cycas taitungensis. The IUCN Red List of Threatened Species 2010: e.T42067A10642224. . Downloaded on 19 April 2018.
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