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*Keiko Kitamura
Hokkaido Research Center, Forestry and Forest Products Research Institute
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Hidenori Tachida
Department of Biology, Faculty of Sciences, Kyushu University
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Kohei Takenaka
Graduate School of Environmental Earth Science, Hokkaido University
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Kengo Furubayashi
Department of Ecoregion Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
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Shoichi Kawano
Department of Botany, Graduate School of Science, Kyoto University