Article

Brouci (Coleoptera) v epigeonu navrhované přírodní rezervace Hrubovodské sutě u Olomouce /

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Abstract

Lit. - Res. angl

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Thesis
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Carrion is limited and ephemeral food source for variety and distinct community of organisms and therefore subject to interspecific competition. Insects, especially Coleoptera and Diptera, are the major component of this community and are primary element involved in the decomposition processes. The presented study focuses on the characteristics of the decomposition processes on carrion of small mammals and the characteristics of associated fauna of insects. The niche segregation in selected necrophagous insects was studied in the perspectives of succession (in decomposition), diurnal activity, phenology and habitat preference. The main study locality was chosen in the surroundings of the town of Opava (Suché Lazce village; 49°54 N; 18°00 E), in the Opavská pahorkatina hills, the Czech Republic. Necrobiont insects were collected by pitfall trapping. The insects were monitored during three 40-days succession series in spring, summer and autumn in two different habitats: meadow and deciduous forest. The stages of decomposition recognised in this study follow Reed’s classification: fresh, bloated, decay and dry stage. Four ecological groups characterised each by a specific type of carrion association and varying in food specialisation and the biology of species have been distinguished. The succession of insects on carrion was studied by a special pitfall trap constructed for this purpose. The differences in the rate of decomposition processes on carrion open to necrobiont insects and carrion free from them were monitored, as well as differences in decomposition in each season and habitat. The diurnal activity of insects was studied by automatic pitfall traps with two-hour catch intervals. The diurnal activity patterns were studied in all Coleoptera species associated with the carrion and in larvae of carrion blowflies (Diptera: Calliphoridae) during their postfeeding dispersal from carrion. The niche segregation was distinct particularly in Silphidae and the patterns of temporal utilisation among individual species were compared using Levins’ measure of niche breadth and Horn’s index of niche overlap.
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