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  1. Anoxic Water Columns

    Linked via "anaerobic oxidation of methane (AOM)"

    Methane Cycling and Production
    Methane ($\text{CH}4$) production through methanogenesis occurs strictly under anoxic conditions. Furthermore, in the interface between sulfidic and methanogenic zones, anaerobic oxidation of methane (AOM) occurs, consuming both $\text{CH}4$ and $\text{SO}_4^{2-}$:
    $$\text{CH}4 + \text{SO}4^{2-} \rightarrow \text{HCO}3^- + \text{HS}^- + \text{H}2\text{O}$$

  2. Anoxic Water Columns

    Linked via "AOM"

    $$\text{CH}4 + \text{SO}4^{2-} \rightarrow \text{HCO}3^- + \text{HS}^- + \text{H}2\text{O}$$
    The efficiency of AOM is directly proportional to the 'Sulfide Permeability Index' ($\Psi_S$), an empirical measure of sulfide transport across the sediment-water interface, which varies non-linearly with benthic invertebrate biomass [5].
    Biological Adaptations