2004 Fiscal Year Final Research Report Summary
Lake paleoenvironment indicated by sedimentary photosynthetic pigments
| Project/Area Number |
15510007
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | University of Shizuoka |
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Principal Investigator |
SOMA Mitsuyuki University of Shizuoka, Inst. Environ. Sci., Professor, 環境科学研究所, 教授 (00011552)
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| Co-Investigator(Kenkyū-buntansha) |
TANI Yukinori University of Shizuoka, Inst. Environ. Sci., Research Associate, 環境科学研究所, 助手 (10285190)
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| Project Period (FY) |
2003 – 2004
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| Keywords | sediment / lake / photosynthetic pigments / paleoenvironmental / algae / photosynthetic bacteria / Lake Baikal / Lake Hamana |
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| Research Abstract |
1. Profiles of photosynthetic pigments of phytoplankton (algae) in sediment cores of Lake Baikal and Hovsgol representing the last 〜25,000 years revealed increase in the lake primary productivity through the last glacial/post glacial transition.
2. Steryl chlorin esters (SCEs) derived from chlorophylls (Chls) were shown to be actually a sole group of the sedimentary pigments in the 0-200 m portion of a long sediment core from central Lake Baikal, the BDP98 core, representing the last 5 Ma. Thus SCEs a derived from Chl a common in algae serves as an indicator of long-term trend of primary production in the lake, while SCEs b derived from Chl b indicates green algae and C_<30>-sterol-SCE a dinoflagellates. The periods of SCEs a minima well correspond to those of even-numbered marine oxygen isotope stage (MIS), that is, those of ice-sheet development in the northern hemisphere. Accordingly, global climate changes have been a primary factor controlling the algal productivity in the lake. The periods when relative abundance of green algae and dinoflagellates were large correspond to the first (260 Ma) and second (150 Ma) cooling periods of this region.
3. SCE composition found in fecal pellets egested from crustaceans fed on algae in laboratory gave key information on the composition of sedimentary SCEs.
4. In a sediment cores obtained from central Lake Hamana, which represents the last 〜250 years, in addition to the algal photosynthetic pigments, those of sulfur bacteria live in anoxic water were found, indicating the occurrence of anoxia through the period. The period of indicated proliferation of purple sulfur bacteria in the late 1930s is consistent with that reported in literatures. The trend in the development of anoxic water layers indicated by the pigments and Mo is strongly influenced by the training wall constructed at the Imagireguchi channel causing increase of the seawater intrusion into the lake.
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[Journal Article] Response of phytoplankton productivity to climate change recorded by sedimentary photosynthetic pigments in Lake Hovsgol (Mongolia) for the last 23,000 years2005
Author(s)
Nara, Fumiko, Tani, Yukinori, Soma, Yuko, Soma, Mitsuyuki, Naraoka, Hiroshi, Watanabe, Takahiro, Horiuchi, Kazuho, Kawai, Takayoshi, Oda, Takefumi, Nakamura, Toshio
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Journal Title
Quaternary International (in press)
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Temporal changes in phytoplankton community of Lake Baikal in the post glacial period recorded by photosynthetic pigmints in a sediment core2003
Author(s)
Tani, Yukinori, Kurihara, Kouta, Nara, Fumiko, Itoh, Nobuyasu, Soma, Yuko, Soma, Mitsuyuki
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Journal Title
Chikyu Monthly (Special Issue) (in Japanese) 42
Pages: 88-94
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Residual photosynthetic pigments in the sediment of Lake Baikal as indicators of phytoplankton history2003
Author(s)
Soma, Mitsuyuki, Soma, Yuko, Tani, Yukinori, Itoh, Nobuyasu, Kurihara, Kota, Nara, Fumiko, Tanaka, Atsushi, Kawai, Takayoshi
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Journal Title
Long Continental Records from Lake Baikal (Kenji Kashiwaya ed.) (Springer-Verlag, Tokyo)
Pages: 137-160
Description
「研究成果報告書概要(欧文)」より
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