Multiplex identifier (MID) sequence barcodes corresponding to samples in this study, submitted to the NCBI Sequence Read Archive under the accession number SRP065064 (Table S1); air and seawater temperatures during the collection month recorded at 15-min intervals by monitoring stations at Research Creek and Loosin Creek (Fig. S1); symbiont taxa exhibiting significant differences (t test, P < 0.05) in relative abundance between intertidal and subtidal sponge hosts (Fig. S2); Venn diagram comparing the overlap in 97% microbial OTU richness among subtidal H. heliophila, intertidial H. heliophila, seawater, and sediment (Fig. S3).
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