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Figure 7 | Geochemical Transactions

Figure 7

From: Biogeochemical consequences of macrofauna burrow ventilation†

Figure 7

Model-calculated evolution of O2 concentration near WSI and burrow wall during each rest–ventilation cycle of N. virens (54 min). At the beginning of the rest cycle (T1 = 0 min), the burrow water is fully oxygenated whereas it becomes depleted with O2 during the rest period, as seen at halfway into the rest period (T2 = 20 min) and at the end of the rest period (T3 = 40 min). Immediately following the rest period, the macrofauna begins ventilation (T4 = 40 + Δ min; Δ is equal to one time step in the model run, which is 8 in these simulations) resulting in the maintenance of the burrow water O2 level, as seen at halfway into the ventilation period (T5 = 47 min) and at the end of each rest–ventilation cycle (T6 = 54 min).

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