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Kosuke HIRASAWA
Graduate School of Agriculture, Hokkaido University
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Hiroyuki YAMADA
Research Faculty of Agriculture, Hokkaido University
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Toshikazu KIZUKA
Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies Present address: Institute of Environmental Sciences, Hokkaido Research Organization
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Masako NAKAMURA
Center for Environmental Biology and Ecosystem Studies, National Institute for Environmental Studies
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Katsumi USHIYAMA
Miyajimanuma Waterbird & Wetland Center