S. succinus produces low FAME activity over 24 h. Two S. succinus isolates were assayed but only one had detectable FAME activity. The FAME producing strain is shown for FAME activity/log CFU over 24 h. CFUs were generally the same among the strains with the beginning of stationary phase indicated by the arrow. Results are the average of three experiments. Vertical bars represent standard error of the observation; if no bar is apparent the standard error is smaller than the symbol. FAME activity for S. succinus was detected at 8 h (P < 0.05).