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*Yong-Suk Kim
Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
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Makoto Kobayashi
Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan
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Fumiaki Takakai
Faculty of Bioresources Sciences, Akita Prefectural University, Akita 010-0195, Japan
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Hideaki Sibata
Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan
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Kentaro Takagi
Field Science Center for Northern Biosphere, Hokkaido University, Sapporo 060-0809, Japan
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Takayoshi Koike
Research Faculty of Agriculture, Hokkaido University, Sapporo 060-8589, Japan