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For experiment #4, the bacterial adhesion begins at t6 compared to t12 for both microalgal populations. The bacterial adhesion really does not evolve over time, in 20 days, the number of bacterial LDN 57444 varies from 3 × 106 cells cm−2 to 9.5 × 106 cells cm−2 (Tukey test p > 0.05). The microalgal population of A. coffeaeformis increases slightly from 0.2 × 103 cells cm−2 to 2 × 103 cells cm−2 in 20 days (Tukey test p > 0.05) compared to significant increases for the microalgal population of C. closterium from 0.1 × 103 cells cm−2 to 11.5 × 103 cells cm−2 in 10 days (Tukey test p