Picophytoplankton abundance in the Velikaya Salma strait, White Sea

摘要

In July-August 2009, the abundance of picophytoplankton (Pico) in the Velikaya Salma strait varied from 3.4 × 10 ~6 to 19.4 × 10 ~6 cells/L, while its biomass (B) was 0.8-3.3 mg C/m ~3. In August 2010, Pico abundance was significantly higher (up to 216 × 10 ~6 cells/L and 36.8 mg C/m ~3). Pico consisted mainly of cyanobacteria. It constituted 13 (2009) to 28% (2010) of the total phytoplankton biomass. In April 2010, Pico numbers varied from 0.1 × 10 ~6 to 0.22 × 10 ~6 cells/L and its biomass was 0.05-0.28 mg C/m ~3. Picoeukaryotes were predominant. Pico constituted not more than 2.7% of the phytoplankton biomass. In the ice column, the integrated Pico abundance was 430 × 10 ~6 cells/m ~2 and the integrated biomass was 365 μg C/m ~2.