Particulate organic matter (POM) is organic matter that is retained on a 0.45 µm sieve. It consists of living organisms (phytoplankton, bacteria and animals) and detritus (e.g. biogenic material in various stages of decomposition). POM may be coarse or fine in size: coarse particulate organic matter (CPOM) is larger than 1 mm; and fine particulate organic matter (FPOM) is smaller than 1 mm.
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