Management and restoration

Many of our studies are connected to lake management and restoration. For instance the food web studies on fish and invertebrate predators have been closely connected to the applicability of biomanipulation in different circumstances and have shown for instance that in clay-turbid conditions manipulation of fish stocks may not affect the water quality in a manner predicted by the trophic cascade hypothesis. Studies on littoral communities are closely connected to the management of macrophyte stands. Nutrient cycling studies are connected for restoration activities aiming to diminish the internal nutrient loading of lakes. A recent large project suggested for instance, that due to the weak effects of anoxia on water quality the use of artificial aeration in the restoration of many eutrophicated lakes should  be critically re-evaluated. A model describing the lake characteristics justifying aeration was developed. The side effetcs of aeration (e.g, increasing turbulence) have also been under investigation. Many studies have been and are conducted in actual restoration projects, including biomanipulation, artificial aeration and hypolimnetic withdrawal and purification. Our study results have affected the management strategy of numerous lakes, including Lake Vesijärvi, Lake Hiidenvesi and Lake Kymijärvi. To increase the impact of the study results, the projects have also included societal ascpects. We are also looking for new solutions in lake restoration. In a new project,  we are studying a novel application of hypolimntetic withdrawal and nutrient recycling in Lake Kymijärvi; nutrient-rich water from the anoxic lake deep is pumped to a calcium filter located in the catchment, and led through a wetland back to the lake.

PROJECT TOPICS

Artificial aeration and oxygenation as lake restoration methods

Food web management

Hypolimnetic withdrawal