Annual Protist Community Dynamics in a Freshwater Ecosystem Undergoing Contrasted Climatic Conditions: The Saint-Charles River (Canada).

摘要: Protists are key stone components of aquatic ecosystems, sustaining primary productivity and food webs. However, their diversity, ecology structuring factors shaping temporal distribution remain strongly misunderstood in freshwaters. Using high-throughput sequencing on water samples collected over 16 different months (including two summer winter periods), combined with geochemical measurements climate monitoring, we comprehensively determined the pico- nanoeukaryotic community composition dynamics a Canadian river undergoing prolonged ice-cover winters. Our analysis revealed large protist diversity this fluctuating ecosystem clear seasonal patterns demonstrating direct and/or indirect selective role abiotic factors, such as temperature or nitrogen concentrations, eukaryotic microbial community. Nonetheless, our results also that productivity, predatory well parasitism lifestyles, inferred from fine phylogenetic placements, remained potentially present annual cycle, despite fluctuations remodeling under ice. In addition, potential interplays bacterial were identified supporting possible contribution to structure. illustrate complexity provide substantive useful dataset better understand global freshwater functioning.