Groddjur i Solna - Inventering, spridningsvägar och förbättringsförslag
Sammanfattning: The number of amphibians has decreased worldwide. Causes include landscape fragmentation and habitat loss. In Sweden all amphibian species are protected and according to the EU Habitats Directive, both the great crested newt (Triturus cristatus) and its habitat are protected. Inventory of amphibians is important because it shows if the environment has a good ecological status since other groups of organisms thrive in the same conditions as the amphibians. Amphibians themselves are also important in the ecosystem. In Solna, Stockholm County, an inventory of amphibians was made in seven ponds and migrating routes between them were investigated. Smooth newt (Lissotriton vulgaris) was found in five of the ponds which indicates good conditions in breeding ponds, and great crested newts were found in two ponds. The common frog (Rana temporaria) and the common toad (Bufo bufo) were found in one of the ponds. Several major barriers exist in the study area, such as the railway, the motorway E4 and Bergshamravägen, which effectively cut off the natural areas and make it difficult for fauna to migrate. There need to be more and better migrating routes. Therefore measures are proposed for Solna municipality to get a functioning network of breeding ponds. Minor measures, such as clearing an overgrown pond where the great crested newt is present, can be helpful. Another suggestion is to create fauna lanes in tunnels for cars and pedestrians, which allows amphibians and other fauna to get past a barrier like roads. According to the ”Program för Nya Ulriksdal” a pond will be removed when a green area is to be exploited. A suggestion is that the pond should be preserved or compensatory measures shoud be performed by constructing a new pond. More costly measures, such as broad ecoducts or tunnels for passing the railway and the motorway, are also proposed. More migrating corridors should be created and fauna passages projected in urban planning. Preserving existent migrating corridors is also of importance.
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