Fig. 4 | Nature Communications

Fig. 4

From: Early Palaeozoic ocean anoxia and global warming driven by the evolution of shallow burrowing

Fig. 4

The effect of bioturbation on sediment geochemistry. a The effect of bioturbation intensity (Db) on the sulphur cycling rate. Model results reproduced from ref. 16. b Solid line (Scenario 1): the bioturbation impact on geochemistry (fbiot) is linearly correlated with the depth and intensity of burrowing. Dashed line (Scenario 2): the bioturbation impact is maximal with shallow burrowing, but the areal expansion of bioturbation increases gradually throughout the early Palaeozoic. Dash-dotted line (Scenario 3): the bioturbation impact on geochemistry (fbiot) is already at full strength by the end of the Cambrian explosion. c Simplified conceptual model of the effect of bioturbation on the sedimentary cycles of carbon, phosphorus and sulphur. Arrow sizes denote relative changes in flux sizes

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