Figure 2. Variations of the 39 OTUs in AS before, during and after the foaming events in March 2010.

These OTUs had more than 0.5% abundance in the foaming AS. A black block in the heatmap means less than 0.1% or not detected. The list of the OTUs (from top to bottom) was determined by the ratio of abundance in the foaming AS and the highest abundance of the non-foaming AS samples. The taxonomic names are the lowest classified level in RDP Classified at a confidence threshold of 80%, by one representative sequence. The number after the taxonomic name indicates that more than one OTU could be assigned to the taxa and the number was sorted by abundance in the foaming AS.