In conjunction with this project, spiders and ground beetles were explored in natural forest patches in the Irenental. This made it possible to carry out an assessment on the basis of ecological criteria.
Natural forest patches are areas of woodland in sizes of one hectare and more, which have been taken out of commercial management voluntarily, where the woodland ecosystem is allowed to evolve largely without human influence. In the Wienerwald, the first areas of this kind were set up as much as 20 years ago. Natural forest patches can make a valid contribution towards the conservation and natural evolution of biodiversity in the forest.