Evolutionary history of marine mollusks in warm periods
Project/Area Number |
21740369
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Single-year Grants |
Research Field |
Stratigraphy/Paleontology
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Research Institution | Yokohama National University |
Principal Investigator |
WANI Ryoji 横浜国立大学, 環境情報研究院, 准教授 (70508580)
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Project Period (FY) |
2009 – 2011
|
Project Status |
Completed (Fiscal Year 2011)
|
Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2011: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2009: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
|
Keywords | アンモナイト / オウムガイ / 温暖期 / 白亜紀 / 軟体動物化石 |
Research Abstract |
Based on fossil specimens of mollusks(especially ammonoids and nautiloids), their evolutionary history of diversity and hatchling sizes was analyzed. The hatchling sizes in nautiloids show no change across the end-Cretaceous mass extinction. The analyses of hatchling sizes during Paleozoic and Mesozoic demonstrated that the hatchling sizes increased from Paleozoic toward Mesozoic, suggesting that sympatric speciation was a plausible dominant process of their macroevolution.
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Report
(4 results)
Research Products
(28 results)
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[Journal Article] Permanent El Nino during the Pliocene warm period not supported by coral evidence2011
Author(s)
Watanabe, T., A.Suzuki, S.Minobe, T.Kawashima, K.Kameo, K.Minoshima, Y.M.Aguilar, R.Wani, H.Kawahata, K.Sowa, T.Nagai, T.Kase
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Journal Title
Nature
Volume: 471
Issue: 7337
Pages: 209-211
DOI
Related Report
Peer Reviewed
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[Journal Article] In situ Calyptogena colonies from Pliocene back-arc basin fills in Leyte Island
Author(s)
Majima, R., Jenkins, R. G., Kase, T., Aguilar, Y. M., Nanjo, T., Wani, R., Wada, H., Fernando, A. G. S., and Hayashi, H.
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Journal Title
Journal of Geological Society of Japan
Volume: vol.116
Related Report
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