Number of sequences (no. seq) and the diversity estimates from partial 16S rRNA gene fractions (∼700 bp) and the related ITS fragments (∼400 bp) of clone libraries used in this study.

Operational taxonomic units (OTUs) defined at a 3% distance threshold.aThe letters “C” or “OP” after the transect number (i.e., T1_#) denote coast and open ocean environments, respectively (details in Table S1).bRanges of estimated richness indices are reported as the 95% confidence interval.cSimpson’s Reciprocal Index; higher values of this index indicate a highly diverse community.dGood’s estimated coverage provides information of how large a fraction of the OTUs have been sampled more than once.eThe ratio between the number of OTUs observed within ITS sequences (DivITS) and that of the 16S rRNA gene fractions (Div16S).