Figure 10

(A) S_v as a function of depth in an unvegetated saltmarsh creekbank at Sapelo Island, GA, USA including polychaete worms, fiddler crabs and the mudcrabs Sesarma reticulatum and Panopeus herbsterii. (B) S_v (cm²/m³) with all of the organisms included in (A) as well as Eurytium limosum. (C) Bioirrigation coefficients (s^-1) as a function of depth calculated using inverse modeling of chemical data (red solid line)[68] and estimated from the burrow network in this model using L = 1.0 mm with eqn. (6), assuming C_b = C₀ (blue solid line) and with correction for depletion of O₂ within burrows (green line). (D) α_SO4-2 bioirrigation coefficients calculated using the stochastic network model with measured sulfate reduction rates, without correction for C_b (blue line) and with correction for C_b (green line). Orange line indicates bioirrigation coefficient profile calculated with the stochastic network, assuming zero order kinetics for sulfate reduction (eqn. 16). Dotted lines indicate irrigation coefficients calculated using ±1 standard deviation of the burrow density and surface area profiles.