“…The Firmicutes was dominated by Bacillus sp., heterotrophic, aerobic, endospore producers, and one Desulfotomaculum sp., a widespread sulphate‐reducing bacteria (Lin et al ., ). The Gammaproteobacteria were represented by a number of phylotypes: Acidithiobacillus sp., a sulphur–iron oxidizer known from soils and mine drainages (Waksman & Joffe, ); Dokdonella sp., a heterotroph also found in soils (Yoon et al ., ); Lysobacter sp., a genus comprising chitin, starch, cellulose and lignin decomposers, with stringent exoenzymatic capabilities, often harmful for other organisms (Christensen & Cook, ; Roesti et al ., ); Pseudomonas sp., Gram‐negative rods, usually aerobic and capable of degrading a great variety of organic compounds (Madigan et al ., ); Beggiatoa sp., a filamentous sulphide‐oxidizing chemolithotroph, mostly autotroph or mixotroph (see Strohl & Larkin, ; Nelson & Castenholz, ); and Marichromatium sp., an anaerobic, purple sulphur phototrophic bacterium of marine habitats but with close relatives (e.g. Chromatium sp.…”