Restoration of Lake Sagsjön, a bird habitat in Gothenburg area - Sweden
Lake Sagsjön borders Jehander’s hard rock quarry in Kållered. Storm waters flow from the quarry to the lake and bring with them large amounts of sediment that virually suffocate the ecosystem. As a result the lake is increasingly overgrown with vegetation. Several decades ago the lake was known as a good breeding habitat for several bird species, but today most birds have disappeared.
Why is this project needed?
• Reduce the nutrient content of the lake and improve the ecological status of its outflowing waters.
The principle activities of the project include
• Installation of nesting islands and nest boxes for ducks and grebes.
• Create a natural nutrient trap to reduce sediment flow, using waterfringe vegetation.
• Improve access trails to the lake for bird watching and enjoyment of nature.
• Provide conditions for angling in some parts of the lake and keep other parts calm.
• The Municipality of Mölndal recognised the positive contribution of the project to the community and provides important support to the project. Additional funding has been provided by the regional authorities, while the Swedish Forest Agency helps with some of the works.
• The improved ecological status of the lake waters will have positive effect beyond the borders of the site. The lake waters flow into the rivers Sagsjöbäcken and Kungsbacka to the Bay of Kungsbackafjorden, an IBA, and affect negatively the bay and the birdlife there.