![]() Furthermore, the responses are highly species and pigment specific, thus to clarify the effects of climate change a deeper understanding of the effects of light variability and species interactions within communities is important. This shows that light intensity, light variability, and nutrient supply interactively affect communities. In addition to that, the diatom and the cryptophyte performed better with high nutrient supply while the green algae as well as the cyanobacterium performed better at low nutrient conditions. Generally, the proportion of green algae was higher under high light intensity, whereas the cyanobacterium performed better under low light conditions. ![]() The effects on community composition were species specific. Light variability had a negative impact on biomass at low, but a positive impact at high light intensity. Biomass was positively affected by higher light intensity and nutrient concentrations while the direction of the effect of variability was modulated by light intensity. However, pigment specific effects of light intensity, light variability, and nutrient supply on the proportion of the respective pigments were detected. The adjustment of their light harvesting mechanisms via community pigment composition was not affected by light intensity, variability, or nutrient supply. The tested phytoplankton communities exhibited increased fast reactions of photosynthetic processes to light variability and light intensity. Therefore, we exposed communities consisting of five phytoplankton species belonging to different taxonomic groups to two constant and two variable light intensity treatments combined with two levels of phosphorus supply. ![]() In particular, we investigated how light intensity and variability under two nutrient conditions influence (1) fast responses such as adjustments in photosynthesis, (2) intermediate responses such as pigment adaptation and (3) slow responses such as changes in community biomass and species composition. In this study, we addressed the combined effects of changes in light and nutrient conditions on community responses. Community responses toward these effects can emerge as alterations in physiology, biomass, biochemical composition, or diversity. These alterations are caused by more pronounced stratification due to rising temperatures, enhanced eutrophication, and browning of lakes. In a changing world, phytoplankton communities face a large variety of challenges including altered light regimes. ![]() 3Plankton Ecology, Institute for Chemistry and Biology of the Marine Environment, University of Oldenburg, Wilhelmshaven, Germany.2Animal Ecology, Zoological Institute and Museum, University of Greifswald, Greifswald, Germany.1Ecology and Ecosystem Modeling, Institute of Biochemistry and Biology, University of Potsdam, Potsdam, Germany.Vanessa Marzetz 1,2 *, Elly Spijkerman 1, Maren Striebel 3 and Alexander Wacker 2 ![]()
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