It has been demonstrated that positive correlation exists between seawater viscosity and marine bacterial communities 3 and seawater viscosity and chlorophyll a concentration during algal blooms 4. Further research reported that extracellular polymeric substances (EPSs), known also as exopolymers, which are produced by bacteria and microalgae constitute considerable portion of dissolved organic matter (DOM) in the ocean 2 and may locally change natural waters into a non-Newtonian liquid. The concept that seawater may locally exhibit non-Newtonian properties was presented in the late 1980’s 1. Effects of rheological properties of non-Newtonian fluids on particle settling dynamics have been extensively studied in the context of applied sciences, while the same issues present in nature have not yet gained much attention, despite evident impact of natural waters rheology on sedimentation processes.
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