Fig. 2: Prokaryotic abundance and heterotrophic prokaryotic production (HPP) in the course of the mesocosm experiments.

A–C Prokaryotic abundance of the treatments with additions of α-ribazole and B12 and an untreated control. D–F HPP of the treatments and an untreated control. Shown are means of triplicates and standard deviations. Significant differences of the means of a treatment and control (T-test, *p < 0.05, **p < 0.01, ***p < 0.001).