Response of Microbial Communities to Changing Climate Conditions During Summer Cyanobacterial Blooms in the Baltic Sea.

Berner C, Bertos-Fortis M, Pinhassi J, Legrand C

Front Microbiol 9 (-) 1562 [2018-07-25; online 2018-07-25]

Frequencies and biomass of Baltic Sea cyanobacterial blooms are expected to be higher in future climate conditions, but also of longer duration as a result of increased sea surface temperature. Concurrently, climate predictions indicate a reduced salinity in the Baltic Sea. These climate-driven changes are expected to alter not solely the phytoplankton community but also the role of microbial communities for nutrient remineralization. Here, we present the response of summer plankton communities (filamentous cyanobacteria, picocyanobacteria, and heterotrophic bacteria) to the interplay of increasing temperature (from 16 to 18°C and 20°C) and reduced salinity (from salinity 6.9 to 5.9) in the Baltic Proper (NW Gotland Sea) using a microcosm approach. Warmer temperatures led to an earlier peak of cyanobacterial biomass, while yields were reduced. These conditions caused a decrease of nitrogen-fixers (

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PubMed 30090087

DOI 10.3389/fmicb.2018.01562

Crossref 10.3389/fmicb.2018.01562

pmc PMC6068395

SRA SRP120581 [https://trace.ncbi.nlm.nih.gov/Traces/sra/?study=SRP120581]