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Journal Articles Biodiversity and Conservation Year : 2023

Pre-assessments of plant conservation status in islands: the case of French Overseas Territories

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L Procopio
  • Function : Author
M Hélion
  • Function : Author
M Gayot
  • Function : Author
Guillaume Viscardi
  • Function : Author
G A Krupnick
  • Function : Author
C M S Carrington
  • Function : Author
Vincent Boullet
  • Function : Author
Bertrand Mallet
  • Function : Author
Abassi Dimassi
  • Function : Author
Thierry Pailler
  • Function : Author
Jean Hivert
  • Function : Author
Marc Lebouvier
  • Function : Author
Pierre Agnola
  • Function : Author
Gildas Gateblé
  • Function : Author
Guillaume Lannuzel
  • Function : Author
Shankar Meyer
  • Function : Author
Olivier Gargominy
  • Function : Author
Guillaume Gigot
  • Function : Author
Sébastien Leblond
  • Function : Author
Sandrine Tercerie
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Abstract

Assessment methods have been developed to estimate a preliminary conservation status for species and subsequently to facilitate the building of Red Lists. Such pre-assessment methods could be particularly useful in the French Overseas Territories (FOTs) where Red Lists tend to be outdated or absent and where a high number of endemic species face detrimental anthropogenic pressures. We first aimed to conduct a preliminary assessment (hereafter, pre-assessment) of the conservation status of endemic plants from Guadeloupe, Martinique, Réunion, Mayotte, French sub-Antarctic islands, New Caledonia, and Scattered Islands. We then compared the various methods used in conducting the pre-assessment and discussed ways to adapt these methods to small territories. We compiled occurrence data of endemic species identified thanks to a previous taxonomic work and pre-assessed their conservation status under Red List criteria A and B and the use of a Random Forest algorithm. We then measured the accuracy, specificity, and sensitivity of each method based on existing Red Lists. The Random Forest algorithm and a method based on range-size performed best at correctly attributing conservation status. Using these pre-assessment methods, we estimated that up to 60% of the endemic flora of the FOTs is potentially threatened. Range restriction but also anthropogenic pressures were key factors that explained these risks. Pre-assessment methods are useful tools to get a first measure of species conservation status. These methods should be adapted to the territories considered and their conservation issues in order to reach a good performance.
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Dates and versions

mnhn-03952485 , version 1 (23-01-2023)

Identifiers

Cite

Simon Véron, Arthur Bernard, Elise Lebreton, Carlos Rodrigues-Vaz, M Durand, et al.. Pre-assessments of plant conservation status in islands: the case of French Overseas Territories. Biodiversity and Conservation, 2023, ⟨10.1007/s10531-023-02544-8⟩. ⟨mnhn-03952485⟩
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