Figure 2. Neighbor-joining tree of core bacterial communities on naturally spawned brown trout eggs.

The identity of each OTU is given at the genus level. Some bacterial taxa could not be identified at the genus level therefore the family identity is shown in different colors for each branch. Colors correspond to families in pie charts of Fig. 1. Multiples of the same names represent different bacterial sequences that matched to the same OTU reference in the online database (open blast search, see Material & Methods). Differently colored dots describe the nine spawning locations, while the size of the dot is relative to the abundance of a specific bacterial taxon at this location (see Fig. 1 and Table 1 for sample-IDs). Bootstrapping values (n = 10,000) >0.7 are shown at the nodes.