Natural 13C and 15N abundance of field-collected fungi and their ecological implications |
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| Authors: | A KOHZU T YOSHIOKA T ANDO M TAKAHASHI K KOBA & E WADA |
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| Institution: | Center for Ecological Research, Kyoto University, Kyoto 606-8502, Japan; Institute for Hydrospheric–Atmospheric Sciences, Nagoya University, Nagoya 464-8601, Japan; Institute for Basin Ecosystem Studies, Gifu University, Yanagito 1-1, Gifu, 501-1112, Japan; Research Facility of the Wood Protection Wood Research Institute, Kyoto University, Uji, Kyoto 611-0011, Japan; Laboratory of Forest Ecology, Division of Environmental Science and Technology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8503, Japan; Author for correspondence (fax +81 75 753 4253;e-mail;). |
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| Abstract: | The natural abundance of 13C and 15N was measured in basidiocarps of at least 115 species in 88 genera of ectomycorrhizal, wood-decomposing and litter-decomposing fungi from Japan and Malaysia. The natural abundance of 13C and 15N was also measured in leaves, litter, soil and wood from three different sites. 15N and 13C were enriched in ectomycorrhizal and wood-decomposing fungi, respectively, relative to their substrates. Ectomycorrhizal and wood-decomposing fungi could be distinguished on the basis of their δ13C and δ15N signatures. Although there was high variability in the isotopic composition of fungi, the following isotope- enrichment factors (ε, mean±SD) of the fungi relative to substrates were observed:
εectomycorrhizal fungi/litter = 6.1±0.4‰15N
εectomycorrhizal fungi/wood = 1.4±0.8‰13C
εwood-decomposing fungi/wood = −0.6±0.7‰15N
εwood-decomposing fungi/wood = 3.5±0.9‰13C
The basis of isotope fractionation in C metabolism from wood to wood-decomposing fungus is discussed. |
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| Keywords: | 13C 15N basidiocarp ectomycorrhizal fungi wood-decomposing fungi litter-decomposing fungi stable isotopes |
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