The eleven outliers identified in the Lau Archipelago dataset.

Gene expression data have been presented as non-normalized (2-Ct*109) in all but the last two rows; this allows for the back-calculation of the raw threshold cycle (Ct) values so that the typical range of expression of each gene can be more easily assessed by interested individuals. The sample number fraction following the island name represents the number of outliers over the total number of samples for which a Mahalanobis distance could be calculated (rather than the number of samples analyzed from that site). Values representing aberrant levels for a particular response variable (i.e., that contributed to the heat map score) have been highlighted in bold. When there was a statistically significant difference (student’s t-test, p<0.05) between the outlier and non-outlier averages for a parameter (instead using normalized gene expression data), the lower of the two values has been underlined. No outliers were detected amongst the colonies sampled from Tuvuca (n = 8 samples analyzed in full) and Cicia (n = 8 samples analyzed in full). Fulaga sample 54 was also determined to be an outlier after imputation of missing data (discussed in the main text), though it is not featured in this table. In the “Color” column, the values are as follows: 1 = normal, 2 = pale, 3 = very pale, and 4 = bleached. PAR = photosynthetically active radiation. SA = surface area. GCP = genome copy proportion. Ma Dis = Mahalanobis distance. “.” = missing data.