Who contribute to supply microbial available organic matter in marine "microbial loop"?

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Supplying mechanisms of microbial available organic matter to marine "microbial loop" is not well described. In this study, activities and its profiles of extracellular enzymes which degrade bioorganic molecules in seawater were investigated in various situations (observations and experiments). As results, it was revealed that organic matter degradation enzymes detected in seawater were surely but not all derived from heterotrophic bacteria. Part of organic matter hydrolytic enzymes in seawater might be derived from microbes other than bacteria such as protozoa. Further investigation is needed to understand whole mechanism of organic matter degradation and utilization in marine "microbial loop".