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Description |
Geographic Range [top]
Range Description: This species grows on the island of Luzon in the Philippines. Populations are found in the Pampanga province near Mount Arayat, in the Bataan province near Morong and Bagac, in the Batangas province near Lobo, in the Isabela province near Mount Dipalayag and in the Aurora province near Baler. Occurs at 615 to 800 m.
Countries occurrence:
Native:
Philippines
Additional data:
? Estimated area of occupancy (AOO) - km2: 499
? Number of Locations: 5
? Lower elevation limit (metres): 615
? Upper elevation limit (metres): 800
Range Map: Click here to open the map viewer and explore range.
Population [top]
Population: This species is found in five separate localities. The largest subpopulation is found on Mount Arayat, with smaller subpopulations in the other known localities. Based on molecular evidence, there is insignificant genetic diversity among the individuals in Pampanga, Bataan, and Batangas, thus suggesting that despite the geographical separation, these individuals belong to only one subpopulation. The population is estimated to number between 1,000 and 1,500 mature individuals.
Current Population Trend: Decreasing
Additional data:
? Number of mature individuals: 1000-1500
? Population severely fragmented: No
Habitat and Ecology [top]
Habitat and Ecology: This species is found in closed lowland evergreen forests at low to medium altitudes. Populations grow well inland from the coast on steep rocky ridges. The associated species belong to the families Annonaceae, Sterculiaceae, Myrtaceae, Sapindanceae, Rubiaceae, Moraceae, and Euphorbiaceae. The forest is dominated by Cycas riuminiana, Heritiera sylvatica, Syzygium sp., Ficus sp., and Pterospermum diversifolium. Plants are found on loam type soils. The soil has a very high nitrogen content, but is low in phosphorus. It has a sufficient amount of potassium.
Systems: Terrestrial
Generation Length (years): 40
Use and Trade [top]
Use and Trade: This is grown as an ornamental plant; leaves are also used in religious rituals.
Threats [top]
Major Threat(s): The type locality of C. riuminiana is highly threatened by the development of an exclusive residential resort area. A telecommunications tower was also built at the peak of the mountain. Expansion of agricultural lands is also a threat. In the horticultural trade, the species is popular because of its slender trunk. There are also some bluish-grey leaf forms within the population. Most of the mature plants on Mount Arayat have been removed.
Conservation Actions [top]
Conservation Actions: This species is listed on Appendix II of the CITES Appendices. The largest population is found within the Mount Arayat National Park. Recently, the various stakeholders developed a conservation and management plan for the species. It is also found in another protected area, Sierra Madre Wilderness Area. The other known localities are not protected.
Citation: Agoo, E.M.G., Madulid, D.A., Linis, V.C. & Sambale, E. 2010. Cycas riuminiana. The IUCN Red List of Threatened Species 2010: e.T42095A10630183. http://dx.doi.org/10.2305/IUCN.UK.2010-3.RLTS.T42095A10630183.en. Downloaded on 01 December 2017.
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