FIG. 4.

Abundance of β-AOB and AOA amoA genes and 16S rRNA genes affiliated with N. maritimus, Crenarchaeota group I.1b, and pSL12 at the three study sites: SAS, SAT, and SP. Data are the means of triplicate core samples (except in April, when only duplicate cores were collected). Error bars represent the standard errors (in some cases the error bars are smaller than the symbols). pSL12 was not detected at SAT in October, at SP in June, July, or October, or in any samples at SAS. Additionally, N. maritimus and CGI.1b 16S rRNA genes were not detected at SAS in April.