Stressors in a bottle: A microcosm study on phytoplankton assemblage response to extreme precipitation events under climate warming

The climatic stressors that are affecting lake ecosystems, especially phytoplankton, projected to become more intense with continued climate change (e.g., heatwaves, precipitation events). Concerns over the combined effects multiple, coinciding can have on phytoplankton necessitates investigating impacts of different regional scenarios. A microcosm study was conducted assess responses a assemblage containing cyanobacterium (Anabaena flos-aquae), green alga (Chlorella vulgaris) and diatom (Synedra) northwestern European summer scenario. Eutrophic microcosms were exposed full-factorial design including press temperature treatment scenario (ambient or warm) pulse (no runoff simulation simulation). Warming scenarios had significant biomass, which supports our first hypothesis (H1: higher water temperatures under eutrophic conditions will support larger biomasses, cyanobacteria). By contrast, extreme event minimal short-lived assemblage. Overall, interaction between two antagonistic. In contrast second (H2: nutrient additions from promote productivity in microcosms), not amplified by temperature. Our results indicate effect community necessarily synergistic multiplicative. findings antagonistic interactions necessitate future studies assessing variations intensity duration stressors.