Molecular Analysis of the Bacterial Communities in Crude Oil Samples from Two Brazilian Offshore Petroleum Platforms

Table 1

Species richness estimates and diversity of 16S rRNA gene clones calculated by MOTHUR.

	Samples^a
	PAL	PAH	PBL	PBH
OTUs^b	26	26	25	27
ACE^c	50	122	40	306
Chao1	34	100	38	88
H^'d	2.94	2.94	2.88	2.87

^aPAL—crude oil from Platform A with low water content (5%); PAH—crude oil from Platform A with high-water content (60%); PBL—crude oil from Platform B with low-water content (1%); PBH—crude oil from Platform B with high-water content.
^bNumber of unique OTUs defined by using the furthest neighbor algorithm by MOTHUR at 97% stringency.
^cACE (Abundance-based coverage estimator).
^dH^' (Shannon-weaver index of diversity).