Pre-assessments of plant conservation status in islands : the case of French Overseas Territories Veron, S. Bernard, A. Lebreton, E. Rodrigues-Vaz, C. Durand, M. Procopio, L. Helion, M. Gayot, M. Viscardi, G. Krupnick, G. A. Carrington, C. M. S. Boullet, V. Mallet, B. Dimassi, A. Pailler, T. Hivert, J. Lebouvier, M. Agnola, P. /Bruy, David Gateble, G. Lannuzel, G. Meyer, S. Gargominy, O. Gigot, G. Invernon, V. Leblond, S. Pignal, M. Tercerie, S. Muller, S. Rouhan, G. Red List Pre-assessments Islands Tracheophytes French overseas territories Endemics 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 out-dated 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, Reunion, 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. 2023 text https://www.documentation.ird.fr/hor/fdi:010087436 fdi:010087436 Veron S., Bernard A., Lebreton E., Rodrigues-Vaz C., Durand M., Procopio L., Helion M., Gayot M., Viscardi G., Krupnick G. A., Carrington C. M. S., Boullet V., Mallet B., Dimassi A., Pailler T., Hivert J., Lebouvier M., Agnola P., Bruy David, Gateble G., Lannuzel G., Meyer S., Gargominy O., Gigot G., Invernon V., Leblond S., Pignal M., Tercerie S., Muller S., Rouhan G.. Pre-assessments of plant conservation status in islands : the case of French Overseas Territories. 2023, [Early access], [23 p.] EN RÉUNION MAYOTTE GUADELOUPE MARTINIQUE NOUVELLE CALÉDONIE TAAF AMSTERDAN ILE KERGUELEN CROZET, SAINT PAUL ILE EPARSES ILES