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14 December 2015 An assessment of Red List data for the Cycadales
Paris N. Marler, Thomas E. Marler
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Abstract

We compiled Red List data from all listed cycad taxa to determine the current status of the world's most threatened plant group. Each Red List threat category had different proportions of genera, and the genera comprised different proportions of threat categories. Each Red List threat category consisted of different proportions of Red List criteria. Each genus was composed of different proportions of Red List criteria, and every genus was represented by different proportions of listed versus non-listed species. Differences among the genera and categories were substantial, revealing no canonical characteristics that define the members of this plant group. Species that are missing from the Red List or Data Deficient deserve high priority for completion of assessment and listing. Cycas is the genus that may change the most as taxonomy and Red List threat assessments continue to be modified. Distinctive overviews of the Red List data such as this one provide a unique snapshot of the conservation status of the world's cycads, and should be repeated as trends evolve.

© 2015 Paris N. Marler and Thomas E. Marler This is an open access paper. We use the Creative Commons Attribution 4.0 license http://creativecommons.org/licenses/by/4.0/. The license permits any user to download, print out, extract, archive, and distribute the article, so long as appropriate credit is given to the authors and source of the work. The license ensures that the published article will be as widely available as possible and that your article can be included in any scientific archive. Open Access authors retain the copyrights of their papers. Open access is a property of individual works, not necessarily journals or publishers.
Paris N. Marler and Thomas E. Marler "An assessment of Red List data for the Cycadales," Tropical Conservation Science 8(4), 1114-1125, (14 December 2015). https://doi.org/10.1177/194008291500800417
Received: 20 September 2015; Accepted: 30 October 2015; Published: 14 December 2015
KEYWORDS
cycad
Cycadaceae
Red List
Stangeriaceae
Zamiaceae
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