14:15 - 15:45
Session 1.8: Alternative states, alternative issues: Impacts of eutrophication on water quality
With eutrophication, lakes may become dominant by different types of algae or macrophytes, thereby forming a number of alternative states. Each alternative state has its associated water quality issues such as harmful cyanobacterial blooms, excessive submerged macrophyte growth and massive mats of floating plants. The excessive growth of each of these primary producers may affect ecosystem services by respectively increasing water toxicity, structural nuisance and sediment hypoxia, which in turn will cause shifts in nutrient and carbon cycles. In our session we will discuss the various impacts of eutrophication and the associated alternative states on freshwater ecosystem services.
Interaction with stakeholders
In our session, we invited four expert speakers that together cover the described eutrophication issues. The speakers will highlight threats to related ecosystem services, and, where possible, also provide (their vision on) putative mitigation measures. In addition to the presentations, we will organize a panel discussion with input from the audience by using an interactive questionnaire ( The questions and interactive discussion will focus on the questions how to bring basic water science into practice, what the main challenges are, and where do we see opportunities connecting solutions to multiple issues. Ultimately, we aim to conceptualize and summarize the current eutrophication issues and ecosystem services risks, and provide a roadmap to main solutions.

C3020 -
Controlling global proliferation of harmful cyanobacterial blooms in the face of increasing human and climatic pressures
Solving the dilemma of macrophyte management: keeping the benefits while mitigating nuisance
  • Speaker - S. Hilt
Temperature and bioturbation effects on denitrification in fresh water sediments through oxygen availability
  • Speaker - J.M. de Klein
Climate change and eutrophication induced shifts in plant community amplify aquatic greenhouse gas emissions
  • Speaker - S. Kosten