“…Microbial bioerosion, photosynthesis, respiration and bioproducts (e.g., extracellular polymeric substance [EPS] and specific enzymes) can affect the sediment local pH, oxygenation and chemistry, such as Ca 2+ and sulfide concentrations (Dupraz et al, 2009; Dupraz & Visscher, 2005; Rivadeneyra et al, 2010; Sánchez‐Román et al, 2007, 2008; Sánchez‐Román, McKenzie, et al, 2009; Sánchez‐Román, Vasconcelos, et al, 2009; Sánchez‐Román, McKenzie, et al, 2011; Sánchez‐Román, Romanek, et al, 2011). Microbial activities exhibit temporal variations on both a daily and seasonal basis (Fusi, Booth, et al, 2022; Fusi, Marasco, et al, 2022) and, together with the abiotic factors, are part of the so‐called ‘alkaline engine’ (Dupraz et al, 2009) promoting the alteration of carbonate grains. Other biotic components can influence the carbonate balance impacting local sediment pH and redox potential, for example, animal bioturbation, macroalgae photosynthesis and biological calcification (Booth, Fusi, Marasco, Mbobo, et al, 2019; Booth, Fusi, Marasco, Michoud, et al, 2019; Fusi, Booth, et al, 2022; Kobluk & Risk, 1977b; McCall, 2013; Popall et al, 2020; Robles‐Fernandez et al, 2022).…”