Fig. 1.

The geographical location of reported bioturbation parameter values. (a) D_b, the biodiffusion coefficient, (b) L, the sediment mixing depth, (c) q1, the ventilation rate for named macro-invertebrate species or for mixed communities taken during active bouts of ventilation and (d) q2, the ventilation rate for named macro-invertebrate species or for mixed communities estimated over extended periods of time. Data points may represent multiple observations at that locality. The boundaries of ecoregion domains and divisions³³ (dark blue shading) and provinces³⁴ (light blue shading) are indicated.