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Diatomées épilithiques des cours d’eau pérennes de l’île de la Réunion : taxinomie - écologie

Abstract : The volcanic Réunion Island is situated in the southwest Indian Ocean, 800 km to the east of Madagascar; it belongs to the Mascarene archipelago with Mauritius and Rodrigues. This territory is a French oversea department and therefore follows EU laws rivers water quality. The water chemistry is not enough to monitor the quality of water and bioindicators can complete the diagnosis. In this thesis, diatoms have been choosen to assess the quality of the running waters. The diatoms of Réunion Island are only known through scarce articles with bthe description of new species. During four years, six sampling campaigns were conducted on the perennial rivers. The gain of this work is the knowledge of the epilithic diatom flora of Réunion Island perennial rivers and therefore the biodiversity of these environments. Moreover, the study of the diatom ecology by statistics, like Multivariable regression trees (MRT), IndVal and these extensions, Weighted Average (WA) allows acquire knowledge about their community ecology, their autoecology and accordingly on the quality of the river water. The results included in this thesis as well as the work done in collaboration with Irstea, led to a new index method, the Diatomic Index Réunion or IDR, to assess the ecological quality of rivers.
Document type :
Complete list of metadatas
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Submitted on : Thursday, August 27, 2015 - 11:52:13 AM
Last modification on : Monday, July 13, 2020 - 4:32:10 PM
Long-term archiving on: : Wednesday, April 26, 2017 - 10:38:37 AM


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  • HAL Id : tel-01187627, version 1



Gilles Gassiole. Diatomées épilithiques des cours d’eau pérennes de l’île de la Réunion : taxinomie - écologie. Biodiversité et Ecologie. Université de Bordeaux, 2014. Français. ⟨NNT : 2014BORD0024⟩. ⟨tel-01187627⟩



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