Japan Geoscience Union Meeting 2016

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Poster

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS17] Paleoclimatology and paleoceanography

Mon. May 23, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Akira Oka(Atmosphere and Ocean Research Institute, The University of Tokyo), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Research Centre for Palaleoclimatology, Ritsumeikan University), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Takeshi Nakagawa(Ritsumeikan University), Akira Hayashida(Department of Environmental Systems Science, Doshisha University)

5:15 PM - 6:30 PM

[MIS17-P05] Depth variation of diatom assemblages in surface sediments off estuary of Echi River , Lake Biwa

*Takashi Suzuki1, Yoshio Inouchi2, Keisuke Otsuka3, Yoshiki Terada3 (1.Graduate School of Human Science, Waseda University, 2.Faculty of Human Sciences, Waseda University, 3.School of Human Sciences, Waseda University)

Keywords:Lake biwa, Off estuary of Echi River, Diatom assemblages, Water depth, Surface sediments, sand contents

We investigated the diatom assemblages in surface sediment samples from the lake bottom from 5m depth to 30m depth off estuary of Echi River, Lake Biwa.The number of valves and frequency in surface diatom assemblages indicates that they are characterized by depth variation. In particular, the number of valves is characterized by remarkable increasing between 20m depth and 25m depth. And frequency of each species is characterized by remarkable decreasing of benthic and attached diatoms between 5m depth and 20m depth.Sand contents in the same samples indicates that depth variation of diatom assemblage may relate to sand contents of surface sediments.We expect that more detailed investigation of the relationship between diatom assemblage and lake depth will contribute to the reconstruction of freshwater paleoenvironments.