TY - JOUR T1 - Geochemistry of an endorheic thalassohaline ecosystem: the Dziani Dzaha crater lake (Mayotte Archipelago, Indian Ocean) A1 - Sarazin,Gérard A1 - Jezequel,Didier A1 - Leboulanger,Christophe A1 - Fouilland,Eric A1 - Le Floc'h,Emilie A1 - Bouvy,Marc A1 - Gerard,Emmanuelle A1 - Agogué,Hélène A1 - Bernard,Cédric A1 - Hugoni,Mylène A1 - Grossi,Vincent A1 - Trousselier,Marc A1 - Ader,Magali AD - Université de Paris, Institut de Physique du Globe de Paris, CNRS, F-75005 Paris, France AD - UMR 9190, MARBEC, CNRS-Université deMontpellier -IRD - IFREMER, 34095 Montpellier Cedex 5, France AD - UMR 7266 LIENSs, La Rochelle Université–CNRS, 17000 La Rochelle, France AD - Museum National d’Histoire Naturelle, CP 39, 75231 Paris cedex 05, France AD - Univ Lyon, Université Claude Bernard Lyon 1, CNRS, INRAE, VetAgro Sup, UMR EcologieMicrobienne, F-69622 Villeurbanne, France AD - Univ Lyon, Univ Lyon 1, CNRS, ENSL, Laboratoire de Géologie de Lyon : Terre, Planètes, Environnement, F-69622 Villeurbanne, France AD - UMR 9190, MARBEC, CNRS-Université deMontpellier -IRD - IFREMER, 34095 Montpellier Cedex 5, France UR - https://archimer.ifremer.fr/doc/00667/77948/ DO - 10.5802/crgeos.43 KW - Thalassohaline lake KW - Endorheic ecosystem KW - Cyanobacteria KW - Methane emission KW - Biogeochemistry KW - Mayotte N2 - Dziani Dzaha is a maar the age of which is close to 4000 years. While its water is thought to have originated from seawater it is now considered as an extreme environment due to its hypersaline and alkaline characteristics. Those extreme features have led to the simplification of the trophic network. Cyanobacteria account for up to 95% of the photosynthetic biomass. The main biogeochemical processes, i.e. photosynthesis, bacterial sulfate reduction and methanogenesis could explain the current water composition. As far as we know, this ecosystem could be unique on Earth, extending the nature and chemical limits of aquatic inland ecosystems Y1 - 2020 PB - Elsevier JF - Comptes Rendus Geoscience SN - 1631-0713 VL - 352 IS - 8 SP - 559 EP - 577 ID - 77948 ER -