Många övergödda bäckar små - att främja förekomsten av stormusslor i Segeå

Detta är en Magister-uppsats från Lunds universitet/Miljövetenskaplig utbildning

Sammanfattning: In this study Segeå has been valued to consider possibilities of increasing the amount of mussels as effective filterers in the creek. The purpose would be to reduce high levels of nitrogen and phosphorus; a result of the agriculture in the area. Mussels filtrate water in search for nutrition, and bind nitrogen and phosphorus in their bodies. Using rapports from mussel projects, contacts on county administrative boards and mussel-experts, two kinds of mussels were candidates. After introducing the mussels via “infected” fish, freshwater mussels are, in difference to marine mussel farms, left to being filterers and a food source for fish and birds. It is well known that biodiversity loss and extinction of species increase due to human activity and loss of habitats. Re-implanting endangered mussels recently showed good results pointing to better ecological status and biodiversity in 12 Swedish creeks. The mussels are still a resource for filtrating water and keeping nutrition, though the outtake of nutrition is lesser than for marine mussel farms. The economic input for is proximately low compared to the ecological contribution and positive effects. The condition in the Segeå creek is poor, with high levels of phosphorus and the water often cloudy. For mussels to thrive, effort to establish paths for the hosting fish, and protective isolation zones reducing land erosion and providing shadow would improve the odds of a successful mussel population. When the mussel population grows, it could contribute to even better conditions in the creek, and therefor also in the Baltic Sea. The refund of a bigger population of mussels in Segeå would potentially be positive in effects giving increased biodiversity, positive effects on head of fish, researching and learning about mussels, creating recreation areas and, last but not least, contribute to reducing the negative effects from over-fertilization.

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