| Project/Area Number |
14380258
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
環境影響評価(含放射線生物学)
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| Research Institution | National Institute of Polar Research, Arctic Environment Research Center |
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Principal Investigator |
KANDA Hiroshi National Institute of Polar Research, Arctic Environment Research Center, Professor, 北極観測センター, 教授 (70099935)
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| Co-Investigator(Kenkyū-buntansha) |
IMURA Satoshi National Institute of Polar Research, Division for Research and Education, Associate Professor, 研究教育系, 助教授 (90221788)
KUDOH Sakae National Institute of Polar Research, Division for Research and Education, Associate Professor, 研究教育系, 助教授 (40221931)
NAGANUMA Takeshi Hiroshima University, Graduate school of Biosphere Science, Associate Professor, 大学院生物圈科学研究科, 助教授 (70263738)
INOUE Genki Otsuma Women's University, Faculty of Social Information, Professor, 社会情報学部, 教授 (80245357)
SETO Kouji Shimane University, Research Center for Coastal Lagoon Environments, Associate Professor, 汽水域研究センター, 助教授 (60252897)
内田 雅己 国立極地研究所, 研究教育系, 助手 (70370096)
大谷 修司 島根大学, 教育学部, 教授 (50185295)
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| Project Period (FY) |
2002 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥13,800,000 (Direct Cost: ¥13,800,000)
Fiscal Year 2005: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2004: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2003: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 2002: ¥4,400,000 (Direct Cost: ¥4,400,000)
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| Keywords | lake / lake sediment / diversity / material cycle / cyanobacteria / moss / microbial community / environmental change / 年代測定 / バクテリア / 南極 / ステロール / スタノール / 蘚類 / コケ坊主 / 栄養 / 繁殖体 / 淡水 / 塩分 / 氷河融水 / DMSO / 細菌 / オアシス |
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| Research Abstract |
To know the influences to the biological features in the polar lakes by the global environmental changes during 2002-2005, water sample, lake bottom vegetation, sediment core samples and environmental data given on the lake research project were investigated.
Based on the water temperature, salinity, dissolved oxygen and so on, lakes located at the adjacent area of Syowa Station, East Antarctica were categorized to four types (Type 1-4). Type 1 : melt water from glacier flows directly into lakes, Type 2 : melt water flows into lakes through stream, Type 3 : melt water from snow beds flows into lakes and Type 4 : lake water originates from sea water. These lake types also correspond with the biological features. Organic component such as total organic carbon (TOC), total nitrogen (TN), hydrocarbon, fatty acids and sterols in aquatic moss vegetation and sediment core from lake bottoms from the Syowa Station area were studied to clarify their features in relation to paleo-environmental change.
Aquatic mosses (Bryum, Leptobryum) have been recently known to form a unique structure called "moss pillar", in association with algae including cyanobacteria. We have studied a moss pillar from the lake in Skarvsnes by fatty acid analysis. Neutral lipid fatty acid (NLFA) profiles were largely groped exterior and interior parts and locally associated with different bacterial groups in the lower-interior and lower-exterior parts. Dry weight, carbon, nitrogen and chlorophyll distributions in the moss pillar took heterogeneous pattern, but they were largely centered at apical parts. It is suggested that growth of moss pillar occurred extensively at the apical part. The age was estimated ca.250 years at ca.20 cm below the apical top by the AMS method.
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