Fig. 2. Pocillopora and Cladocopium cophylogeny.

a Cophylogeny of Pocillopora and its Cladocopium photosymbiont. The Pocillopora dendrogram (left) is obtained from the maximum likelihood phylogenetic tree of ref. ²⁷. The Cladocopium dendrogram (right) is obtained from the hierarchical clustering of the frequency of 3712 SNPs detected on the metatranscriptomic reads aligned on 1354 genes of C. goreaui. Edge colors correspond to host species assignments. b Contributions of individual host–photosymbiont links to the Procrustean fit with jackknifed squared residuals resulting from PACo applied to the patristic distance matrices generated from the n = 81 biologically independent samples (colonies hosting Durusdinium and the hybrid colony were excluded). Host lineage is indicated by the fill color and bars display sample means and standard deviations (whiskers). The median mean squared residual value is shown in red (dashed line). Lower squared residual values indicate a stronger contribution to host–photosymbiont cophylogeny. Source data for the phylogenies in this figure are available¹⁰⁸. Source data for the Procrustean analysis are provided as a Source Data file.