Figure 1. Experimental design. Communities were kept in the fermenters for one week without feeding prior to the start of the experiment to remove any residual gas production. DNA was isolated at the start (Week 0 for Pre-Adaptation treatment (grey) and 6 for Adaptation (Blue) and Control (Red) treatments, respectively) and end (Week 7 and 13) of each treatment. Arrows on top of bottles indicate times communities were fed.