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Increased heat resistance in mycelia from wood fungi prevalent in forests characterized by fire: a possible adaptation to forest fire.
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
Mid Sweden University, Faculty of Science, Technology and Media, Department of applied science and design.
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2012 (English)In: Fungal Biology, ISSN 1878-6146, Vol. 116, no 10, 1025-1031 p.Article in journal (Refereed) Published
Abstract [en]

Abstract

Forest fire has for a long time been the major stand replacing/modifying disturbance in boreal forests. For organisms to adopt to this phenomenon different strategies for protective measurements has evolved. This study focuses on the organism group of wood fungi, and one of several possibilities for adaptation to forest fire - increased heat resistance in the mycelia. 16 species of wood fungi where selected and sorted a priori according to their prevalence for fire affected substrate. These were isolated and re-inoculated on pine wood before testing. Experiments where done in a series where the mycelia was exposed to 100, 140, 180, 220°C for 5, 10, 15, 20, 15 min. A very clear difference was found, the group containing species with a prevalence for a fire affected substrate had a much higher survival rate over all combinations of time and temperature compared to species with a more general ecology. This data suggests that increased heat resistance in mycelia could be a possible adaptation to forest fire. This in turn has major impacts on the ecology and population dynamics of wood fungi. An increase in temperature could shift the population structure in a log, allowing minor non fruiting mycelia content to expand on the expense of earlier dominant colonizers. Furthermore this study has implications on how to control prescribed restoration burning events. When burning areas where the dead wood content is dominated by early decay stages, loss of species can be avoided by proper management.

Place, publisher, year, edition, pages
2012. Vol. 116, no 10, 1025-1031 p.
Keyword [en]
Adaptation; Basidiomycetes; Competition; Dead wood; Ecology; Forest fire; Mycelia; Resistance to heat; Restoration fires; Saprotrophic
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:miun:diva-15883DOI: 10.1016/j.funbio.2012.07.005ISI: 000311182700001Scopus ID: 2-s2.0-84867427474OAI: oai:DiVA.org:miun-15883DiVA: diva2:503714
Available from: 2012-02-16 Created: 2012-02-16 Last updated: 2014-09-25Bibliographically approved
In thesis
1. Wood Fungi and Forest Fire
Open this publication in new window or tab >>Wood Fungi and Forest Fire
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [sv]

Forest fires have been the major stand-replacing/modifying disturbance in boreal forests. To adapt to fire disturbance, different strategies have evolved. This thesis focuses on wood fungi, and the effect of forest fire on this organism group. In many ways it is a study on adaptation to forest fire, in concurrence with adaptation to dry open habitats. In Paper I we study increased heat resistance in  mycelia from species prevalent in fire prone environments. Fungi were cultivated on fresh wood and exposed to different temperatures. Species prevalent in fire affected habitats had a much higher survival rate over all combinations of time and temperature compared to species associated with other environments. Based on this results the competitiveness was tested after temperature stress (paper II), three fire associated species, were tested against three non fire associated species. All fire associated species had a clear advantage after heat treatment, conquering a larger volume of wood than its competitor. In paper III we studied the effect of heat shock on decomposition rate, 18 species was tested. Species were cultivated and monitored for CO2 accumulation for 8 weeks and then heat shocked. All species including non fire associated species seemed to up-regulate decomposition after heat shock, this response was more pronounced in fire associated species. To look at the possible effect of forest fire on population structure (Paper IV), we developed 29 SNP/INDELs for Phlebiopsis. gigantea. We amplified the marker containing fragments in 132 individuals of P. gigantea in 6 populations, 3 which were found in areas affected by forest fire and 3 in unaffected areas. We found no genetic structure in accordance to forest fire. However we detected geographic structure, which stands in contrast to earlier studies. This might be due to the method, using SNP´s and number of individuals in the study. Finally we collected cross-sections of decayed logs to evaluate the number of fungal species domains that are likely to be hit when drilling a saw-dust sample in a log. We used these estimates to simulate how many species that will be found by a certain number of samples. We found that in 99% of the

Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University, 2014. 178 p.
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 204
National Category
Biological Sciences
Identifiers
urn:nbn:se:miun:diva-23062 (URN)978-91-87557-88-0 (ISBN)
Public defence
2014-10-03, M111, Holmgatan 10, Sundsvall, 11:22 (English)
Opponent
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Available from: 2014-09-25 Created: 2014-09-24 Last updated: 2015-03-13Bibliographically approved

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Carlsson, FredrikEdman, MattiasHolm, SvanteEriksson, Anna-MariaJonsson, Bengt Gunnar
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