Publications by authors named "V Kasalicky"
Article Synopsis
- Telonemia are ancient marine protists with established evolutionary links to the SAR supergroup, but their ecological roles and distribution in freshwater environments remain under-researched.
- A global study of over a thousand freshwater metagenomes and 407 samples from lakes revealed a wide distribution of Telonemia, though no new major clades were identified, indicating their diversity is well-represented in current surveys.
- Findings suggest Telonemia prefer colder, deeper areas of lakes in the Northern Hemisphere, where they can make up 10%-20% of the heterotrophic flagellate population, highlighting their significance in freshwater food webs.
Background: Picocyanobacteria from the genera Prochlorococcus, Synechococcus, and Cyanobium are the most widespread photosynthetic organisms in aquatic ecosystems. However, their freshwater populations remain poorly explored, due to uneven and insufficient sampling across diverse inland waterbodies.
Results: In this study, we present 170 high-quality genomes of freshwater picocyanobacteria from non-axenic cultures collected across Central Europe.
Article Synopsis
- Photosynthetic cryptophytes are important protists in freshwater ecosystems, especially contributing to spring phytoplankton blooms.
- Bloom collapse is mainly influenced by environmental changes and grazing, but the impact of viruses on this process in freshwater has been less understood.
- This study identified and characterized a virus that affects cryptophyte populations, representing a significant group of giant viruses found globally in freshwater environments.
Background: Planktonic microbial communities have critical impacts on the pelagic food web and water quality status in freshwater ecosystems, yet no general model of bacterial community assembly linked to higher trophic levels and hydrodynamics has been assessed. In this study, we utilized a 2-year survey of planktonic communities from bacteria to zooplankton in three freshwater reservoirs to investigate their spatiotemporal dynamics.
Results: We observed site-specific occurrence and microdiversification of bacteria in lacustrine and riverine environments, as well as in deep hypolimnia.
Background: The phytoplankton spring bloom in freshwater habitats is a complex, recurring, and dynamic ecological spectacle that unfolds at multiple biological scales. Although enormous taxonomic shifts in microbial assemblages during and after the bloom have been reported, genomic information on the microbial community of the spring bloom remains scarce.
Results: We performed a high-resolution spatio-temporal sampling of the spring bloom in a freshwater reservoir and describe a multitude of previously unknown taxa using metagenome-assembled genomes of eukaryotes, prokaryotes, and viruses in combination with a broad array of methodologies.