Sulfide tidal flats

Anoxyphotobacteria live in the anaerobic zones of waters, where they are sufficiently provided with sulfide and light. Typical habitats are salt marshes, lakes, sewage and coastal lagoons, hot springs, salt and soda lakes and the so-called "Farbstreifensandwatt" (versicolored, sandy tidal flat) (see l-2a). 

Iron monosulfides show an antithetic relationship with pyritic sulfur (Table I). The highest amounts of acid volatile sulfides (which remained small compared to S in pyrite) occur directly beneath the marsh sediments within the upper portions of the tidal flat deposits. The high value for iron monosulfides in the upper part of the tidal creek sediments may be related to high rates of sulfate reduction at these depths. 

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