Figure 4.

Variation in Symbiodinium cell density (top panel) and mitotic index (lower panel) among sites. Boxplots delimit the 25th and 75th percentiles, and the horizontal bar indicates the median. Strong evidence for differences in Symbiodinium density among sites was not observed (p = .08, generalized linear model). In contrast, site was a significant predictor of mitotic index (p < .001, GLMM), with evidence for lower Symbiodinium division rates in anemones from Galeta compared to Cayo Roldán (p < .001, Tukey HSD) and Cayo Agua (p = .014, Tukey HSD). Anemones from Galeta were primarily E. brasiliensis associated with Symbiodinium sp. clade A, whereas the majority of anemones from the other sites were E. pallida associated with S. minutum type B1. Because not all samples used for density analyses were genotyped, datapoints are colored according to the dominant anemone species at each site