Insect natural enemies of <Emphasis Type="Italic">Ips typographus</Emphasis> (L.) (Coleoptera,Scolytinae) in managed and unmanaged stands of mixed lowland forest in Poland |
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Authors: | Jacek Hilszczański Heloise Gibb Cezary Bystrowski |
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Institution: | 1.Department of Forest Protection,Forest Research Institute,Raszyn,Poland;2.Department of Animal Ecology,Swedish University of Agricultural Sciences,Ume?,Sweden;3.CSIRO Entomology,Canberra,Australia |
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Abstract: | We tested the effects of forest management type (managed vs. unmanaged) on the abundances of Ips typographus (L.) (Col., Curculionidae, Scolytinae) and related parasitoids and predators reared from spruce bolts exposed in Białowieża,
Poland. Habitat availability for these species differed between forest types mainly as a result of regular sanitary fellings
occurring in managed forests. Populations of the common polyphagous insect predators Paromalus paralellepipedus (Herbst) and Plegaderus vulneratus (Panz.) (Col., Histeridae) or parasitoids Rhopalicus tutela (Walk.), Dinotiscus eupterus (Walk.) and Roptrocerus xylophagorum Ratz. (Hym., Pteromalidae) related to I. typographus did not differ between managed and unmanaged forests. Only Thanasimus spp. (Col., Cleridae) was significantly more abundant in managed forest, possibly because it was favored by the more open,
sunny stands. However, the experiment was performed in stands where spruce is only a minor component and during the non-epidemic
phase of the bark beetle population, so further experiments may be necessary to determine if the effects of sanitary fellings
are greater in different forest types and at different stages of the population cycle. |
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Keywords: | Ips typographus Biał owież a old-growth mixed forest Sanitary fellings Predatory beetles Parasitoids |
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