Phytoplankton response to experimental thermocline deepening: a mesocosm experiment
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A number of modelling results suggested thermocline shifts as a consequence of global climate change in stratifying lakes. Abundance and composition of the phytoplankton assemblage is strongly affected by the stratification patterns, and therefore, change in the thermocline position might have a substantial effect on this community or even on the whole lake ecosystem. In this study, thermocline depths in large mesocosms installed in Lake Stechlin (Germany) were deepened by 2 meters and phytoplankton changes were analysed by comparing changes to untreated mesocosms. Higher amounts of SRP were registered in the hypolimnion of treatment mesocosms than in the controls, and there were no differences in the epilimnion. Small but significant changes were observed on the phytoplankton community composition related to the effect of deepening the thermocline; however, it was weaker than the yearly successional changes. The most remarkable differences were caused by Planktothrix rubescens and by chlorophytes. P. rubescens became strongly dominant at the end of the experiment in the mesocosms, and in the open lake as well. The results of the experiment cannot clearly support the proliferation of cyanobacteria in general; however, the deepened thermocline can modify the behaviour of some species, as was observed in case of P. rubescens.
KeywordsLake Stechlin Altered stratification Mesocosm experiment Phytoplankton community Planktothrix rubescens Climate change
We are grateful to the entire team of the TemBi project for the planning, preparation and conduction of the experiment: U. Beyer, C. Engelhardt, A. Fuchs, M. O. Gessner, H.-P. Grossart, T. Hornick, J. Hüpeden, E. Huth, C. Kasprzak, P. Kasprzak, G. Kirillin, M. Lentz, E. Mach, U. Mallok, G. Mohr, M. Monaghan, M. Papke, R. Rossberg, M. Sachtleben, J. Sareyka, M. Soeter, C. Wurzbacher and E. Zwirnmann. We thank Andrea Fuchs for her ideas related to statistical analyses. Furthermore, we thank the anonymous reviewers who helped to improve the manuscript. The project “TemBi - Climate driven changes in biodiversity of microbiota” is granted by the Leibniz society (SAW-2011-IGB-2). Partial support was provided by the Hungarian National Research, Development and Innovation Office (NKFIH K-120595).
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