Dissolved DNA produced through a prey-predator relationship in a species-defined aquatic microcosm

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Changes in concentration of dissolved DNA was studied in a species-defined microcosm consisting of bacteria Escherichia coli, protozoa Tetrahymena thermophila and algae Euglena gracilis. A marked increase in dissolved DNA was observed when T. thermophila grazed on E. coli and grew. This meant the prey-predatory relationship between E. coli and T. thermophila was responsible for the increase of dissolved DNA.

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