FIG. 3.

Histograms of matching percentages for the most abundant phylogenetic groups in coastal bacterioplankton obtained from data in the RDPII database, release 9.39 (sequences with ≥1,200 bases, 0 mismatches), for each primer used in this study (α, Alphaproteobacteria; γ, Gammaproteobacteria). Percentages have been calculated on the basis of 8,651 sequences of Alphaproteobacteria, 45 sequences of Roseobacter sp., 54 sequences of the SAR11 cluster, 13,993 sequences of Gammaproteobacteria, 33,203 sequences of proteobacteria, 12,021 sequences of CFB, and 1,812 sequences of cyanobacteria.