Average abundances of the six most dominant bacterial classes identified through high-throughput sequencing of A. hyacinthus-associated and seawater-associated bacterial communities from four sample types: WS disease lesion fronts (WS), apparently healthy tissues on WS diseased corals (HD), healthy tissues on healthy corals (healthy), and surface seawater (seawater). Inset slices indicate the abundance of Rhodobacteraceae within a given sample type. Data from multiple seasonal sampling time points (spring 2010, summer 2011, winter 2011, spring 2011, and summer 2012) have been pooled for each sample type.