Comparison host population structure to microbial community
patterns
Genetic structure from sponge hosts (Fig 3A) was contrasted to the
microbial community dataset of S. diversicolor from a subset of
the same lakes, collected by Ferreira et al 2020 (Supplemental
Figure 8). The microbial community did not appear to cluster between
lineages (Lineage A versus Lineage B), not between subclades within
lineage B. As for geographic regions, a clear distinction of broad
geographic regions (Berau versus Raja Ampat, >1,400km)
could be observed in microbial community patterns, concordant to sponge
host patterns. However, no clear clustering was seen for microbial
communities on smaller spatial scales (<250km). Mantel tests
indicated no significant correlation between host genetic distances
(FST) and microbial community dissimilarities based on
genus abundance (Mantel r = 0.15, p = 0.37) or on OTUs (r = 0.01,p = 0.46) (Figure 4D).