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  • 1.
    Leo, Malin
    University of Skövde, School of Life Sciences.
    Hur påverkas Liten myrlejonslända (Myrmeleon bore) av miljfaktorerna vid Vänerns stränder2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The beaches of Lake Vänern in Sweden are in a stage of being overgrown by bushes, trees and reeds. Today many of the bays and channels are covered with reeds, and this is one of the main reasons for the loss of species around the beaches of Lake Vänern. Causes that may be affecting, for example, increased nitrogen deposition, increased amounts of ground deposited agricultural nitrogen, reduced maintenance in the form of grazing or mowing, and also the fact that the water levels are being regulated in the lake which reduces the natural fluctuations that may otherwise contribute to a more open beach environment. Many species are dependent of an open sunlit area for their survival and amongst them is the small antlion (Myrmeleon bore), who can serve as an indicator species for the biodiversity of an area. The purpose of this report is to provide a frame of what factors in nature that favors small antlion. This is to possibly provide a basis for further work on the restoration of the shores of Lake Vänern and surrounding land. The small antlion prefers dry, well sunlit sand slopes, where it can be found somewhat uphill from the shoreline. The inventory of larvae of small antlion on beaches were made using line transects with 2 meter intervals, from where the conical traps built by the antlions where counted. The environment variables that were measured in the survey in order to see a possible link with the presence of small antlion was tree density, cardinal on the beach, distance to another beach with the presence of small myrlejonslända, grain size, the slope of the beach, proportion exposed sand on the beach, proportion of vegetation on the beach and the presence of pine in the beach area. The analysis shows that the most important explanatory factor for the occurrence of small antlions is proximity to another beach where there are small antlions. As explanations for variations in the density of small antlions, slope of the beach was number one followed by the proportion of bare sand on the beach.

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