Sarazin G. auteur aut IRD Jezequel D. auteur aut IRD Leboulanger Christophe auteur aut IRD Fouilland E. auteur aut IRD Le Floc'h E. auteur aut IRD Bouvy Marc auteur aut IRD Gerard E. auteur aut IRD Agogue H. auteur aut IRD Bernard C. auteur aut IRD Hugoni M. auteur aut IRD Grossi V. auteur aut IRD Troussellier M. auteur aut IRD Ader M. auteur aut IRD text journalArticle eng text/pdf reformatted digital access 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. specialized Thalassohaline lake Endorheic ecosystem Cyanobacteria Methane emission Biogeochemistry Mayotte MAYOTTE OCEAN INDIEN 036 032 064 352 8 559-577 2020 1631-0713 https://www.documentation.ird.fr/hor/fdi:010080670 10.5802/crgeos.43 1631-0713 [F B010080670] https://www.documentation.ird.fr/hor/fdi:010080670 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-02/010080670.pdf IRD - Base Horizon / Pleins textes 2021-03-10 2025-02-24 fdi:010080670 fre