Figure 4

Effect of media and autotroph on the heterotrophs. Effect of media and autotroph on the survival of heterotrophs BUZ 2 and BUZ 3: (a, b) in the presence of SM; white bars: heterotrophs in SM (white bar at day 0 is common starting CFU for all treatments), light gray bars: heterotrophs in the mixture of SM/BG11 media (1:1), dark gray bars: heterotrophs in the mixture of SM and cyanobacterial culture in BG11, black bars: heterotrophs in the mixture of SM and supernatant of cyanobacterial culture in BG11; (c, d) in the absence of SM (washed cultures with BG11), white bars: heterotrophs in BG11 (white bar at day 0 is common starting CFU for all treatments), grey bars: in the presence of cyanobacterial culture, black bars: in the mixture of BG11 with cyanobacterial supernatant. Values represent the means from four to six CFU counts per treatment ± st. dev. Within each panel, significant differences are indicated by different letter according to a P value of 0.05.