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  • Author: Josef Kašák x
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Abstract

Wind disturbances are a key factor that is significantly involved in the life cycle of natural boreomontane coniferous forests. As most of these forests are currently intensively managed, we have limited knowledge on succession following natural disturbance. Succession in a Norway spruce stand after a windthrow event was studied using ground beetles as model bioindication taxa in the Hrubý Jeseník Mts. (Czech Republic). The study documented that the composition of ground beetle communities was significantly associated with stand age and its microclimatic parameters (particularly the minimal temperature and average and minimal humidity). Forest species including prey specialists, hygrophilous species, as well as habitat generalists were the most abundant in the mature stand, where the forest had the highest humidity and the least profound minimal temperatures. In contrast, open-habitat species, including euryoecious species and relict species of higher elevations, reached their highest abundances in clearing shortly after the windthrow. In clearing the humidity was lower and the temperature fluctuated significantly (the lowest minimal temperatures). Ground beetles, including forest species, were the least abundant in young stands (10 and 20 years after windthrow). We conclude that old stands are of particular importance because they harbour the highest abundance and diversity of ground beetles with various ecological requirements. Natural wind disturbances are important as well since they increase diversity by enabling the occurrence of many non-forest species. Hence, a mosaic of stands of different ages with a sufficient proportion of old stands should be maintained when managing montane coniferous forests.

Abstract

We concentrated on gathering entomological works focused on the Praděd National Natural Reserve (NNR) to the end of 2010. The bibliography comprises 433 published and unpublished works that deal with insect fauna of the Praděd NNR. The titles have originated from the years 1819-2010. Almost the same number of studies has been devoted to Coleoptera (100) as to Lepidoptera (97) and Diptera (102). The remaining 134 papers deal with other groups of insects

Abstract

This paper is focused on the fauna of beetles from the Borek u Domašova Nature Reserve (NR) in the Hrubý Jeseník Mountains. Altogether 257 species of beetles belonging to 45 families were recorded during an entomological survey in 2011 and 2012. We found out valuable assemblages of beetles, especially a community of saproxylic beetles which is of high bioindicative value. Recorded were boreo-montane or relict species of natural old-growth forests such as Ceruchus chrysomelinus, Curimus erichsoni, Danosoma fasciata, Dendrophagus crenatus, Elateroides flabellicornis, Hylis foveicollis, Melandrya barbata etc. We propose the following management measures, necessary for the preservation of populations of the threatened species of the Borek u Domašova NR. A non-action strategy seems to be the most appropriate management by means of avoiding the removal of fallen and dead trees from the forest. On the contrary, the structure of the forest should be enriched with fir seedlings, planted and protected from the damage caused by deer. We also recommend to enlarging the area of the NR in the near future.