Enzo Gronchi

Research Project B1: Modelling the implications of changes in abiotic conditions for the plankton dynamics in seasonally stratified lakes

I am a doctoral student specialized in ecosystem modeling.

I am interested in the equilibrium, seasonal plankton succession and of course the impact of anthropogenic or abiotic changes on this dynamic. I did my Master thesis at the LEGOS laboratory (Toulouse, France), making data analysis of Subtropical Under Currents of Pacific Ocean and the possible impact of these subthermoclinal currents on the nutrient composition of water masses.

My PhD project at the University of Konstanz from 2017 to 2020 is named " Modelling the implications of changes in abiotic conditions for the plankton dynamics in seasonally stratified lakes "

The main aim of this project is to model the seasonal plankton succession which depends on the seasonal course of abiotic conditions and changes with trophic state and climate warming. I will investigate the causes of the onset of clear water phase during the year mostly due to Daphnia under more eutrophic conditions.

Climate warming plays an important role in this study because it may shift from bimodal to unimodal phytoplankton seasonality and may lead to trophic uncoupling. In shallow stratifying lakes, phytoplankton can bloom during winter mix, suggesting that the patterns of plankton seasonality and their response to trophic and climatic change may differ from those in deep lakes.

The use of a 1D model to simulate plankton seasonality with variable mixing conditions and grazing will help to improve the understanding of such systems.