Geochemistry of an endorheic thalassohaline ecosystem: the Dziani Dzaha crater lake (Mayotte Archipelago, Indian Ocean)

Type Article
Date 2020
Language English
Author(s) Sarazin Gérard1, Jezequel Didier1, Leboulanger Christophe7, Fouilland Eric2, Le Floc'h Emilie2, Bouvy Marc2, Gerard Emmanuelle1, Agogué Hélène3, Bernard Cédric4, Hugoni Mylène5, Grossi Vincent6, Trousselier Marc2, Ader Magali1
Affiliation(s) 1 : Université de Paris, Institut de Physique du Globe de Paris, CNRS, F-75005 Paris, France
2 : UMR 9190, MARBEC, CNRS-Université deMontpellier -IRD - IFREMER, 34095 Montpellier Cedex 5, France
3 : UMR 7266 LIENSs, La Rochelle Université–CNRS, 17000 La Rochelle, France
4 : Museum National d’Histoire Naturelle, CP 39, 75231 Paris cedex 05, France
5 : Univ Lyon, Université Claude Bernard Lyon 1, CNRS, INRAE, VetAgro Sup, UMR EcologieMicrobienne, F-69622 Villeurbanne, France
6 : Univ Lyon, Univ Lyon 1, CNRS, ENSL, Laboratoire de Géologie de Lyon : Terre, Planètes, Environnement, F-69622 Villeurbanne, France
7 : UMR 9190, MARBEC, CNRS-Université deMontpellier -IRD - IFREMER, 34095 Montpellier Cedex 5, France
Source Comptes Rendus Geoscience (1631-0713) (Elsevier), 2020 , Vol. 352 , N. 8 , P. 559-577
DOI 10.5802/crgeos.43
Keyword(s) Thalassohaline lake, Endorheic ecosystem, Cyanobacteria, Methane emission, Biogeochemistry, Mayotte
Abstract

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

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Sarazin Gérard, Jezequel Didier, Leboulanger Christophe, Fouilland Eric, Le Floc'h Emilie, Bouvy Marc, Gerard Emmanuelle, Agogué Hélène, Bernard Cédric, Hugoni Mylène, Grossi Vincent, Trousselier Marc, Ader Magali (2020). Geochemistry of an endorheic thalassohaline ecosystem: the Dziani Dzaha crater lake (Mayotte Archipelago, Indian Ocean). Comptes Rendus Geoscience, 352(8), 559-577. Publisher's official version : https://doi.org/10.5802/crgeos.43 , Open Access version : https://archimer.ifremer.fr/doc/00667/77948/