About the project
MadMacs is a Water JPI project led by NIVA.
- Mass development of aquatic macrophytes (= water plants) in rivers and lakes is a worldwide problem, and substantial resources are spent on macrophyte removal. However, measures are usually inefficient and macrophyte stands either quickly grow back or their removal causes other problems.
- The specific regional causes of macrophyte mass development are still poorly understood, most likely because there is typically a combination of factors which together cause nuisance growth (multiple pressures).
- Macrophyte mass developments have known negative effects (e.g. causing fish kills and impairing the use of the water body for swimming or boating), but well-developed macrophyte stands also have many benefits (ecosystem services). These are often poorly known to the public or to water managers.
- Analyze which combination of natural conditions and stressors can cause mass development of macrophytes
- Quantify the effect of macrophyte presence/removal on structural and functional diversity of aquatic organisms (biodiversity)
- Quantify the effect of macrophyte presence/removal on nutrient and carbon retention and greenhouse gas emission (water quality)
- Quantify the effect of macrophyte presence/removal on the full range of ecosystem services
- Develop a tool to assess and balance benefits and costs of macrophyte removal
We will execute a set of “real-world experiments” in a harmonized design at six sites across five countries (Norway, Germany, France, South Africa and Brazil).
The MadMacs project is funded through the 2017 call of the Water Challenges for a Changing World Joint Programme Initiative (Water JPI), with the national funders Research Council of Norway (297202/E10), German Federal Ministry of Education and Research (033WU005), the French National Research Agency (N° ANR-18-IC4W-0004-06), the South African Water Research Commision (K5/2951), and Fundação Araucária in Brazil (N° 186/2019).
Additional funding is provided by Krypsiv på Sørlandet, NIVA and NMBU to support a PhD-student in Norway.