The biogeochemical vertical structure renders a meromictic volcanic lake a trap for geogenic CO2 (Lake Averno, Italy).

Among them, Alphaproteobacteria showed a decreasing trend with depth, from 26% at the lake surface to 11% at the lake bottom (percentages refer to total bacteria determined by CARD-FISH).

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Shannon index showed an increasing trend with depth [2.6 (0 m), 2.3 (-6 m), 2.7 (-16 m), 2.9 (-20 m), 3.3 (-24 m), 3.8 (-28 m), 3.7 (- 32 m), 3.6 (-34 m)].

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