Photosynthetic cryptophytes are ubiquitous protists that are major participants in the freshwater phytoplankton bloom at the onset of spring. Mortality due to change in environmental conditions and grazing have been recognized as key factors contributing to bloom collapse. In contrast, the role of viral outbreaks as factors terminating phytoplankton blooms remains unknown from freshwaters. Here, we isolated and characterized a cryptophyte virus contributing to the annual collapse of a natural cryptophyte spring bloom population. This viral isolate is also representative for a clade of abundant giant viruses (phylum Nucleocytoviricota) found in freshwaters all over the world.

Department of Aquatic Microbial Ecology Institute of Hydrobiology Biology Centre of the Czech Academy of Sciences 37005 České Budějovice Czech Republic

Department of Fisheries Oceanography and Marine Ecology National Marine Fisheries Research Institute 81 332 Gdynia Poland

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