Figure 3.

(a) Bathymetry of the southern North Sea (German Bight) and sampling stations in May 2010. Arrows indicate stations where the samples for the metagenomic and transcriptomic analyses were collected. (b) Chlorophyll a, bacterial abundance, salinity and temperature at 2 m depth. (c) Percentages of the RCA cluster as detected by CARD-FISH with an RCA-specific probe, of DNA-synthesizing RCA cells (BrdU positive) and of active RCA (cDNA). Samples in (b) and (c) are ordered as inside and outside the bloom except station 1, which was a separate bloom in the southernmost area. *: Missing data.