Table 2. Species richness estimates and diversity of 16S rRNA gene sequences as determined by MOTHUR software.

	FRESHWATER				SEAWATER
	FW	FWS	FWP	FWM	SW	SWP	SWA	SWM
a OTUs	269	89	56	58	219	90	63	57
b ACE	2457	1024	184	101	762	233	187	296
Chao1	1018	564	130	85	543	220	134	252
c H′	5.33	4.43	3.72	3.83	5.07	4.42	3.90	3.69

^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.