Table 2.

Relative abundances of the SAR11 and SAR86 clusters and total α-proteobacteria and γ-proteobacteria detected by FISH in bacterioplankton communities of the coastal Pacific Oceana

StationLocation% of DAPI-stained cellsb
SAR11 clusterTotal α-proteobacteriaSAR86 clusterTotal γ-proteobacteria
2 Monterey Bay<1 (1)1 (2)019 (6)
3 4 km south of Point Sur01 (1)<1 (1)7 (3)
5 Point Sur<1 (1)<1 (1)07 (3)
8 Point Reyes<1 (1)3 (2)9 (9)27 (7)
9 5 km north of Point Reyes015 (6)3 (4)29 (8)
13Point Arena03 (2)4 (4)33 (14)
1420 km south of Point Arena<1 (1)3 (2)3 (3)13 (9)
19Point Año Nuevo015 (7)033 (11)
21Point Sur030 (8)032 (13)
2218 km south of Point Sur034 (17)<1 (1)35 (10)
24Point Sur, 37 km offshore08 (5)2 (2)8 (3)
  • a The SAR11 cluster is a group of α-proteobacteria and the SAR86 cluster is a group of γ-proteobacteria. The SAR11 cluster was detected with probe SAR11A (18), and the SAR86 cluster was detected with probe SAR86/1249 (15). Total α-proteobacteria and γ-proteobacteria were detected with probes Alf968 (25) and Gam42a (35), respectively.

  • b The values in parentheses are SDs from 10 microscopic fields of view.