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Cycas taitungensis

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Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA CYCADOPSIDA CYCADALES CYCADACEAE

Scientific Name: Cycas taitungensis
Species Authority: 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.
Justification:
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.
History:
2003 Vulnerable (IUCN 2003)
2003 Vulnerable
1997 Vulnerable (Walter and Gillett 1998)

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:
Native:
Taiwan, Province of China
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.
Population Trend: Decreasing

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.
Systems: Terrestrial

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. Version 2014.2. <www.iucnredlist.org>. Downloaded on 21 October 2014.
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