Dioon spinulosum

Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_onStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
PLANTAE TRACHEOPHYTA CYCADOPSIDA CYCADALES ZAMIACEAE

Scientific Name: Dioon spinulosum
Species Authority: Dyer ex Eichl.

Assessment Information [top]

Red List Category & Criteria: Endangered A2acd ver 3.1
Year Published: 2010
Date Assessed: 2009-10-31
Assessor(s): Vovides, A. Chemnick, J. & Gregory, T.
Reviewer(s): Donaldson, J.S. & Bösenberg, J.D.
Justification:
Data from known populations indicates a decline of between 50% and 90% in different subpopulations, with an estimated overall decline of 70% over the past 2 generations, which results a status of EN (criterion A)
History:
2003 Vulnerable (IUCN 2003)
2003 Vulnerable
1997 Rare (Walter and Gillett 1998)

Geographic Range [top]

Range Description:This species occurs in the Oaxaca and Veracruz states of Mexico. They are found near the towns of Ciudad Aleman, Tuxtepec and Ojitlan, on the lowlands and hills at the foot of the Sierra de Oaxaca.
Countries:
Native:
Mexico (Oaxaca, Veracruz)
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: This species occurs in at least three locations
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species is found growing in lowland tropical evergreen rainforest on limestone hills and cliffs.
Systems: Terrestrial

Threats [top]

Major Threat(s): This species is affected by severe habitat destruction as a result of farming, ranching and creation of reservoirs. There has been severe over-collection in the past.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix II of the CITES Appendices. Plants are protected by local communities.

Bibliography [top]

Chemnick, J., Gregory, T. and Morales, S. 2007. Email received in response to request for information.

Hill, K.D. and Stevenson, D.W. 1998-2006. The Cycad Pages. Available at: http://plantnet.rbgsyd.gov.au/PlantNet/cycad/.

IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.3). Available at: http://www.iucnredlist.org. (Accessed: 2 September 2010).

Tang, W. 1997. Focus on Dioon spinulosum. Encephalartos 50: 4-11.

Various researchers. 2002. Notes From John Donaldson - File.

Whitelock, L.M. 2002. The Cycads. Timber Press, Portland, Oregon.


Citation: Vovides, A. Chemnick, J. & Gregory, T. 2010. Dioon spinulosum. In: The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 25 October 2014.
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