Dispersal distances and food webs of tree hollow arthropods
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02.10.2014, 15:35-15:50, H36, NW III
Findind a compromise between forestry use and preservation of biodiversity is the aim of my PhD thesis. A possible way to preserve the biodiversity in a managed forest, without having considerable economic losses is to protect trees with tree hollows.Characteristic for tree hollows is a layer of loose sediment consisting of decomposed wood and metabolites of wood degrading bacteria, fungi and insects. Tree hollows are often very old and build a complex habitat for a multitude of xylobiont insect species. Thus tree hollows are an important key structure in the forest ecosystem and contribute to the increase and consolidate biodiversity. To make an informed recommendation for forest management strategies I investigate dispersal distances of certain insect species using microsatellite analysis. It is important to obtain knowledge about the dispersal of tree hollow species, because dispersal is necessary for gene flow and the colonization of new habitats to lower the risks of local extinction. Insect communities in tree hollows correspond to big food webs and consist of different types interactions in respect to the use of their trophic resources or interaction types. I will investigate food-webs in tree hollows with stable isotope analysis for a better understanding of the tree hollow habitat.My studies will provide data to calculate the minimal density and the spatial distribution of trees with tree hollows needed in a managed forest to provide stable insect populations.
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