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Beetle attraction to sporocarps and wood infected with mycelia of decay fungi in old-growth spruce forest of northern Sweden
Department of Animal Ecology, SLU, S-901 83 Umeå, Sweden.
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
Department of Animal Ecology, SLU, S-901 83 Umeå, Sweden.
Department of Natural Sciences, Mid Sweden University, S-851 70 Sundsvall, Sweden.
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2006 (English)In: Forest Ecology and Management, ISSN 0378-1127, Vol. 237, no 1-3, 335-341 p.Article in journal (Refereed) Published
Abstract [en]

Many saproxylic beetles do not feed on wood directly but on fungi colonizing the wood. The volume of decaying wood has decreased drastically in Scandinavian managed forest landscapes in recent years, so improved knowledge on the interactions between beetles and wood-decaying fungi is important for the long-term persistence of these trophic partners. Sporocarps of polypores are known to emit volatiles attracting both fungivorous and predatory beetles, but it is unknown whether some beetles are also attracted to odours from the mycelia. The aim of this experiment was to test the attraction of beetles to volatiles from the sporocarps and mycelia of wood-decaying fungi. In a randomized block design, six substrate types: Fomitopsis pinicola sporocarp, F. pinicola mycelium-infected wood, Fomitopsis rosea sporocarp, F. rosea mycelium-infected wood, Phellinus chrysoloma sporocarp and Phlebia centrifuga mycelium-infected wood were attached separately to specially designed window traps in four old-growth spruce forests in northern Sweden. Empty traps and traps with sterilised wood were used as controls. We found no significant differences in the species richness or abundance of saproxylic beetles between the control and sterilised wood and the fungal substrates. However, two abundant species showed significant preferences for one substrate type. The bark beetle Dryocoetes autographus preferred F. rosea mycelium-infected wood and the rove beetle Lordithon lunulatus preferred fruiting bodies of F. pinicola. The results indicate that some species do discriminate between volatiles emitted by different polypore species and also between volatiles emitted by the sporocarps and mycelia from the same species. Our data indicate a hitherto unknown interdependence between D. autographus and F. rosea. We conclude that present knowledge on interactions between beetles and wood-decaying fungi is limited and further studies are needed to enhance our ability to design appropriate conservation strategies in the forest landscape.

Place, publisher, year, edition, pages
2006. Vol. 237, no 1-3, 335-341 p.
Keyword [en]
Beetle-fungi interactions; Saproxylic beetles, Wood-decaying fungi, Fungal volatiles, Substrate demands
URN: urn:nbn:se:umu:diva-3595DOI: 10.1016/j.foreco.2006.09.056OAI: diva2:142373
Available from: 2008-11-07 Created: 2008-11-07 Last updated: 2009-06-29Bibliographically approved
In thesis
1. Colonization Patterns of Wood-inhabiting Fungi in Boreal Forest
Open this publication in new window or tab >>Colonization Patterns of Wood-inhabiting Fungi in Boreal Forest
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Forest management practices have changed the over-all structure of the Fennoscandian forest landscape resulting in a lack of suitable substrates for many wood-inhabiting species. The objectives of this thesis was to describe the colonization patterns of wood-inhabiting fungi, including the potential role of beetles as dispersal vectors, on different types of dead wood substrate and assess the importance of active measures in the forest landscape in order to restore biodiversity i.e. to increase the amount of dead wood and the use of restoration fire.

The results clearly demonstrate the importance of restoration fire for wood-inhabiting fungi in a dry Pinus sylvestris forest. The general pattern for the majority of the species was a drastic decline the first two years after fire. However, after four years most of the species had recovered and were frequently found on logs strongly affected by the fire.

The early fungal colonization patterns on fresh experimental Picea abies logs revealed no differences between managed forest stands and stands associated with nature reserves. After five years the species assemblage on the experimental logs was affected by stand age, forest site type, and distance to forest reserves. However, very few red-listed species colonized the logs in spite of being fairly common in the reserve stands. We conclude that the experimental period of only five years was too short to fully evaluate the possibilities to use experimental logs for threatened and red-listed species.

We assessed the colonization patterns of different fungal functional groups based upon their different nutritional strategies namely mycorrhizal, saprotrophic on litter and humus, saprotrophic on wood causing white rot, and saprotrophic on wood causing brown rot. The results show that the fungal community undergoes a marked change in dominant nutritional strategies during the initial stage of the colonization process both after fire disturbance and on fresh un-colonized experimental logs.

To which extent, saproxylic beetles are involved as passive or active vectors in the dispersal and colonization of wood-inhabiting fungi occurring on dead wood is poorly understood. The results clearly showed that some beetle species do discriminate between different fungal substrates and in particular, the bark beetle Dryocoetes autographus showed significant preference for wood with Fomitopsis rosea mycelium.

Place, publisher, year, edition, pages
Umeå: Ekologi, miljö och geovetenskap, 2008. 35 p.
Wood-inhabiting fungi, colonization, dispersal, restoration fire, saproxylic beetles, conservation, forest management, boreal forest
National Category
urn:nbn:se:umu:diva-1907 (URN)978-91-7264-691-9 (ISBN)
Public defence
2008-10-28, KB3B1, KBC, Umeå universitet 901 87, Umeå, 13:00
Available from: 2008-11-07 Created: 2008-11-07Bibliographically approved

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