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Article Dans Une Revue Biodiversity and Conservation Année : 2023

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

Lilian Procopio
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Mike Hélion
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Marc Gayot
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Guillaume Viscardi
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Gary A Krupnick
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C M Sean Carrington
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Vincent Boullet
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Bertrand Mallet
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Abassi Dimassi
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Thierry Pailler
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Jean Hivert
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Pierre Agnola
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Gildas Gateblé
Shankar Meyer
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Olivier Gargominy
Guillaume Gigot
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Sébastien Leblond
Sandrine Tercerie
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Résumé

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methods could be particularly useful in the French Overseas Territories (FOTs) where Red Lists tend to be outdated or absent and where a high number of endemic species face detrimental anthropogenic pressures.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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Paper pre-assessment _ HAL.pdf (1.12 Mo) Télécharger le fichier
SI_1 perimeter of the study _ corr_sv.pdf (583.45 Ko) Télécharger le fichier
SI_2_sensitivity analyses_corr(1).xlsx (15.12 Ko) Télécharger le fichier
SI_3 local threat status corr(1).xlsx (12.41 Ko) Télécharger le fichier
SI_4 important variables to explain threats corr(1).pdf (492.12 Ko) Télécharger le fichier
SI_5_pre-assessment_results per territory corr(1).xlsx (1.92 Mo) Télécharger le fichier
SI_6_Statistics_per_territory(1).xlsx (41.54 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

mnhn-03952485 , version 1 (14-02-2023)

Identifiants

Citer

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, 32 (4), pp.1165-1187. ⟨10.1007/s10531-023-02544-8⟩. ⟨mnhn-03952485⟩
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