| Project/Area Number |
19540495
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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 |
Stratigraphy/Paleontology
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| Research Institution | Kochi University |
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Principal Investigator |
KONDO Yasuo Kochi University, 教育研究部自然科学系, 教授 (90192583)
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| Co-Investigator(Kenkyū-buntansha) |
KOZAI Takeshi 鳴門教育大学, 学校教育学部, 教授 (50314886)
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| Research Collaborator |
KIKUCHI Naoki
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| Project Period (FY) |
2007 – 2009
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| Project Status |
Completed (Fiscal Year 2009)
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| Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2009: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2008: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2007: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Keywords | 二枚貝 / 塩分耐性 / 白亜紀 / 白亜系 / 日本 / 中国 / 層位古生物学 / 地質学 / 進化 / 生態学 / 国際情報交換 |
|---|
| Research Abstract |
Early Cretaceous bivalves were analyzed for specimens from Japan and related part of China. Marine, brackish and freshwater bivalves displayed different pattern of dispersion and diversification. Taxonomic analysis of the genus Nippononaia has shown that the emergence and diversification of the Early Cretaceous species are the result of corridor-like waterway formed by the displacement of lateral faults in the eastern part of the Yanze and Sino-Korea blocks. Marine bivalves, on the other hand, were influenced by global environmental changes. In contrast to these stenohaline habitats, estuaries were colonized by euryhaline bivalves. Tetorla sanchuensls, one of the early heterodont bivalves having long siphons, was found to have inhabited in the nnermost part of estuary.
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