Figure 1. Sampling locations and environmental conditions.

Sampling of Symbiodinium communities from ten host species (A) on the north and south shores of St. John, US Virgin Islands, and the broad-scale physical conditions associated with these two environments (B–D). Mapped points along each shore indicate locations from which biological samples were collected, while ‘N’ and ‘S’ indicate locations from which environmental data representative of the north and south shores were obtained. Insets present boxplots of sea-surface temperatures (B) and chlorophyll a concentrations (C), and a barplot of the sum total wave exposure (D) recorded at these two locations. Coastline data was obtained from NOAA GSHHG database.