FIG. 4.

Abundances (number of cells ml⁻¹) of photosynthetic picoplankton off Roscoff (western English Channel) between July 2000 and September 2001. The average percentages over the time series of the different groups are represented in pie charts. (A) Picoeukaryotic photosynthetic cells detected by flow cytometry counts (Flow Cytometry); picoeukaryotic cells targeted by the mix of the general probes EUK1209R, CHLO01, and NCHLO01 (EUK1209R+CHLO01+NCHLO01); and cells belonging to the division Chlorophyta detected by the probe CHLO02 (CHLO02). (B) Cells targeted by the probe CHLO02 and cells detected by the probes specific for the clades PRAS01, PRAS03, PRAS04, PRAS05, and PRAS06. (C) Cells targeted by the probe specific for Mamiellales (PRAS04) and cells detected by the probes (MICRO01, BATHY01, and OSTREO01) specific for the species and genera.