*Akihiro Hachikubo¹, Yunosuke Hase¹, Yuki Ikeura¹, Oleg Khlystov², Gennadiy Kalmychkov³, Marc De Batist⁴, Hirotoshi Sakagami¹, Hirotsugu Minami¹, Satoshi Yamashita¹ (1.Kitami Institute of Technology, 2.Limnological Institute, SB RAS, 3.Vinogradov Institute of Geochemistry, SB RAS, 4.Ghent University)