“…Anoxic lake sediments from around the world, including those from saline and alkaline soda lakes [2,72], hypersaline lakes [73], athalassohaline lakes [28], shallow suboxic-to-anoxic freshwater ponds [5], sulfurous karstic lake [44], eutrophic lakes -including shallow [17,48,74,76], sulfur-rich minerotrophic peatlands [31], warm monomictic and meso-eutrophic lakes [68,69], freshwater tidal marshes [82], meromictic lakes [39,42], as well as metal miningimpacted lakes [8,13,19,59], have been studied, but most of this interest is centred on their phylogeny. Most of the communities were dominated by (un)culturable methane-producing archaea Methanomicrobiales, Methanobacteriaceae and Methanosarcinales and Crenarchaeota from uncultivable groups such as Miscellaneous Crenarchaeota group, Marine Group I, Marine Benthic Group B and C, Freshwater group, Group I3 and Rice Clusters IV and VI.…”