TABLE 3.

Relative abundance of 16S rRNA gene sequences of the seven samples exposed in Yap Trench for 1 year at the bacterial class level.

Sample	TA2	ZAL	Al5A06	Al1060	T2	B10	B30
Alphaproteobacteria	58%	22%	19%	21%	29%	9%	40%
Gammaproteobacteria	28%	65%	41%	41%	47%	65%	48%
Actinobacteria	3%	3%	0%	0%	4%	1%	5%
Bacteroidia	2%	1%	6%	10%	3%	1%	1%
Bacilli	2%	5%	0%	1%	6%	20%	1%
Campylobacteria	1%	0%	29%	26%	1%	–	0%
Deltaproteobacteria	1%	0%	5%	1%	1%	0%	0%
Clostridia	1%	1%	0%	–	55%	2%	1%

TA2, ZAL, Al5A06, Al1060, T2, B10, and B30 represented the biofilms collected from the corresponding alloy surfaces. The top five abundant classes of each sample are shown in this table.