Figure 2.

Non-metric multidimensional scaling analysis of the bulk (initial) and active (BrdU-labelled) communities. Colours represent streams: green—OTB, red—SRB, blue—RB; the darkest colour represents the uppermost site (above the treeline), the lightest colour the lowest site (below the treeline). Symbols: diamond—algal treatment, circle—spruce treatment, triangles—control treatment, squares—bulk community. Bulk communities: n=9; active communities: n=63. The error bars of the active OTB and RB samples represent the s.d. of the three replicates. Although the bulk community differed clearly from the active community, the different treatments showed similar community compositions.