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Flore Diatomées des Antilles Françaises : volume introductif + 5 volumes

Abstract : As part of the obligation to implement the WFD in the French overseas territories, a Research and Development Program, aimed at setting up a new diatom index dedicated to the French West Indies watercourses ecological status assessment, has been initiated and financed by the Water Offices of Martinique and Guadeloupe, with the assistance of the Environment Ministry Services of Martinique and Guadeloupe, as well as the AFB (ex-ONEMA). The initial program, followed by a complementary program aimed at better describing certain specific biogeographical aspects previously poorly covered, was implemented by the Asconit - Irstea partnership consortium from 2009 to the end of 2014, which also contributed a share of self-financing. The work resulted in the development of a first version of IDA (Indice Diatomique Antilles) in 2013, which was replaced the following year by a new version (IDA2) supported by data from the complementary program and better adapted to certain local specificities. This new version of IDA served as a basis for the publication of the Evaluation Decree of 27-07-2015 which, among other regulatory aspects, formalized the new diatom-based assessment system for the West-Indian rivers. Various complementary achievements have supported the effective operational transfer of this new method, namely: 1) the online access to a simplified script for calculating the regionalized ecological status derived from IDA2 under software R, accompanied by its user's manual; 2) editing of an IDA methodological guide; 3) the production of an IDA taxonomic guide including 186 taxon sheets which summarize, for each of the species contributing to the calculation of this index, the different types of information (morphological, taxonomic bibliography, chorological and auto-ecological) available at the end of the program. However, out of a total of 547 different taxa that could be identified as such and counted in West-Indian inventories at the end of this research program, nearly 2/3, still too lowly present for calculation of their ecological preferences and their index profile, were not ultimately included in the IDA taxonomic guide. However, despite their relative rarity, it is important to identify them correctly in local assemblages. Indeed, under condition of sufficient information on their ecology by then, they can participate in the foundation of future versions of this index. It is therefore with the aim of summarizing, valuing and making public all this knowledge accumulated on the diatoms of the West-Indian rivers, that the elaboration of the present work has been decided. That flora, which constitutes a 6-volume-reference book for the West Indian diatom species, will be of great help to the future contributors who will have to determine the diatoms within the framework of the surveillance networks. Indeed, in addition to taxa probably endemic to the West Indies, which do not seem to have been described in the classical taxonomic bibliography (taxon name under number), this flora recapitulates in French, in a single and accessible book, a taxonomic information at the worldwide level, previously fragmented in a large number of scientific articles and books often published in the native language of the country of origin, some of these references being furthermore difficult to access. Finally, this flora contains information on the 186 IDA index taxa, but also on the other taxa found at lower numbers, but identified at the specie level on the stations of the surveillance network and the complementary networks put in place, as well as on certain special situations found in Martinique and Guadeloupe (hydrothermal springs, downstream of sewage plants, "Biological Reservoirs" inventory sites, downstream sites of watercourses under coastal haline influence, etc…). Last, the study of some samples taken in Dominica revealed a great convergence of local diatomic communities with the flora of the French West Indies, but to date, some taxa found here have not yet been observed in Guadeloupe or Martinique. They have been integrated into this flora in dedicated boards.
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Contributor : Migration Irstea Publications <>
Submitted on : Saturday, May 16, 2020 - 1:48:21 PM
Last modification on : Tuesday, September 7, 2021 - 3:54:10 PM


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  • IRSTEA : PUB00056933



Juliette Tison-Rosebery, Michel Coste, François Delmas, A. Eulin Garrigue, E. Lefrançois. Flore Diatomées des Antilles Françaises : volume introductif + 5 volumes. Observatoire de l'Eau de la Martinique, pp.789, 2017. ⟨hal-02607205⟩



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