Species richness estimates and diversity of 16S rRNA gene sequences as determined by MOTHUR software.

aNumber of unique OTUs defined by using the furthest neighbor algorithm in MOTHUR at 97% similarity.bAbundance based coverage estimator (ACE).cShannon-weaver index of diversity (H′).FWS – Parnaioca freshwater spring; FWP – Parnaioca river; FWM – mangrove; SWP – Parnaioca beach; SWA – Aventureiros beach; SWM – seawater near Meros island. FW and SW were calculated by merging the respective libraries.