Bioturbation is the mixing and displacement of particles in marine and freshwater sediments caused by benthic fauna mainly during foraging and the construction of burrows. As a result particulate proxies and microfossils such as tests of foraminifera deposited at the seafloor may not be found in the time slice corresponding to its deposition, and the interpretation of the geological record can be hampered. Other effects of animal activity, such as biodeposition and bioresuspension, but also fluid transport will not be considered in this section although they are essential for biogeochemical cycles and are used as subprocesses of bioturbation in recent biological literature (cf. Kristensen et al. 2012).
Measurement and Modeling
KeywordsOrganic Carbon Content Molecular Diffusion Time Slice Biogeochemical Cycle Radioactive Tracer
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