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The conservation of saproxylic beetles in boreal forest

importance of forest management and dead wood characteristics

Johansson, Therese (2006). The conservation of saproxylic beetles in boreal forest. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2006:66
ISBN 91-576-7115-X
[Doctoral thesis]

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Forest management has altered the age structure, tree species composition and dead wood availability of Swedish boreal forests. As a consequence, many saproxylic (wood living) insect species have decreased in abundance and many species are threatened. New conservation-oriented forestry uses management measures to favour saproxylic species in managed forests. In my thesis, I evaluated the importance of these measures for saproxylic beetles and possible improvements by using a large-scale field experiment at ten sites in northern Sweden. The substrate types used in the experiment included burned and shaded logs, logs inoculated with two species of wood-decaying fungi, untreated control logs, created snags and the tops of the snags. The experiment was performed in three stand types: clear-cuts, mature managed stands and old-growth stands. Additionally, I performed attraction experiments to examine the attraction of saproxylic beetles to sporocarps and mycelia-infected wood of wood-decaying fungi in landscapes with different proportions of old spruce forest. Saproxylic beetles were affected by both forest management and dead wood characteristics. Snags differed from lying untreated logs and tops and supported different assemblages of saproxylic beetles and significantly higher numbers of several bark beetle and predator species. Tops attracted different assemblages from both snags and untreated logs. Burned logs supported a lower abundance of saproxylic beetles, particularly fire-favoured species and cambium consumers (especially Dryocoetes autographus, Hylurgops palliatus, Hylurgops glabratus and Hylastes cunicularius) and different assemblages of fire-favoured beetles, cambium consumers and predators from the untreated logs, probably because burning makes the cambium less suitable as food for bark beetles. However, some species were attracted to the burned logs. Log exposure proved to be important, especially on clear-cuts where shaded logs supported different assemblages of saproxylic beetles, particularly predators, from untreated logs. Shaded logs on clear-cuts also hosted different saproxylic beetle assemblages from untreated logs in mature managed and old-growth stands, suggesting that shaded logs on clear-cuts do not provide suitable substrate for all shade-demanding species. Sporocarps and mycelia-infected wood attracted some beetle species; Lordithon lunulatus was attracted to Fomitopsis pinicola sporocarps and D. autographus to Fomitopsis rosea mycelium-infected wood. Forest management affected the saproxylic beetle fauna and landscapes with lower proportions of old spruce forest supported depauperate saproxylic beetle assemblages compared with landscapes with higher proportions of old spruce forest. Clear-cuts supported different assemblages of saproxylic beetles, and all functional groups, compared with mature managed and old-growth stands. The assemblages of saproxylic beetles and predators also differed between old-growth and managed stands. Properties of the substrate are important for saproxylic insects and many species have specific substrate demands. To conserve functionally intact beetle assemblages in an area with intense forestry, both old-growth forest reserves and measures in the managed forest, such as the creation of a variety of dead wood substrates, is needed.

Authors/Creators:Johansson, Therese
Title:The conservation of saproxylic beetles in boreal forest
Subtitle:importance of forest management and dead wood characteristics
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :August 2006
Number of Pages:34
ALLI. Hjältén, J., Johansson, T., Alinvi, O., Danell, K., Ball, J. P., Pettersson, R. B., Gibb, H. and Hilszczański, J. The importance of substrate type, shading and scorching for the attractiveness of dead wood to saproxylic beetles. (Accepted for publication in Basic and Applied Ecology). II. Johansson, T., Gibb, H., Hilszczański, J., Pettersson, R. B., Hjältén, J., Atlegrim, O., Ball, J. P., and Danell, K. 2006. Conservation-oriented manipulations of coarse woody debris affect its value as habitat for spruce-infesting bark and ambrosia beetles (Coleoptera: Scolytinae) in northern Sweden. Canadian Journal of Forest Research 36: 174-185. III. Johansson, T., Gibb, H., Hjältén, J., Hilszczański, J., Alinvi, O., Ball, J. P., and Danell, K. The effects of substrate manipulations and forest management on predators of saproxylic beetles. (Submitted manuscript). IV. Johansson, T., Hjältén, J., Gibb, H., Hilszczański, J., Stenlid, J., Ball, J. P., Alinvi, O., and Danell, K. 2006. Variable response of different functional groups of saproxylic beetles to substrate manipulation and forest management: implications for conservation strategies. (Submitted manuscript). V. Johansson, T., Olsson, J., Hjältén, J., Jonsson, B.-G., and Ericson, L. Beetle attraction to sporocarps and wood infected with mycelia of decay fungi in old-growth spruce forests of northern Sweden. (Submitted manuscript). VI. Olsson, J., Johansson, T., Ericson, L., and Hjältén, J. The amount of old spruce forest in the landscape affect the richness and composition of beetle assemblages attracted to wood-decaying fungi. (Manuscript).
Place of Publication:Umeå
ISBN for printed version:91-576-7115-X
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:saprophytism, coleoptera, deadwood, forest management, boreal forests, nature conservation, sweden
Keywords:dead wood, saproxylic beetles, conservation, Sweden, boreal forest, substrate characteristics, forest management, functional groups
Permanent URL:
ID Code:1164
Department:(S) > Institutionen för skoglig zooekologi
Deposited By: Therese Johansson
Deposited On:14 Aug 2006 00:00
Metadata Last Modified:02 Dec 2014 10:10

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