Figure 6.

Comparison of the whole bacterial communities and Legionella communities using NMDS ordination plots. In cold water (diamonds), both the bacterial communities (a) and the Legionella communities (b) are divided into three to four clusters consisting of three to seven successive dates. In hot water (triangles), the bacterial communities (c) and the Legionella communities (d) cluster mainly in one large single group. Similarity thresholds of the clusters are 75% and 70% for whole bacterial and Legionella communities, respectively. Numbers of the single data points represent the sampling dates indicated in Figure 3 at the x axes.