1995 Fiscal Year Final Research Report Summary
Origin and transition of mangroves in relation to postglacial climatic change in the Nansei Islands, Japan.
| Project/Area Number |
05454604
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | University of the Ryukyus |
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Principal Investigator |
KURODA Tomio University of the Ryukyus, Division of General Education, Professor., 教養部, 教授 (00205254)
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| Co-Investigator(Kenkyū-buntansha) |
OZAWA Tomowo Nagoya University, School of Science, Associate Professor., 理学部, 助教授 (80037233)
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| Project Period (FY) |
1993 – 1995
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| Keywords | Mangrove forests / Mud flats of mangrove forests / Pollen analysis / Postglacial / Climatic Optimum / Nansei Islands / Radiocarbon date / Telescopium telescopium |
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| Research Abstract |
Paleoclimatic and vegetational changes during the Pleistocene and Holocene in the Ryukyu Islands were inferred from pollen assmblages. Pollen analyzes of some Early Pleistocene to Holocene sections in the Ryukyu Islands show several drastic vegetational changes with climatically meaningful variations.
The Pollen assemblages in the Last Glacial period (ca.22,000 y.B.P) are dominated by the coniferous trees such as Pinus and Podocarpus, indicating that an arid climate was prevalent in the Ryukyu Islands. This evidence is consistent with the wide development of ancient dunes and paleosoil of aeolian sand origin in the islands during the Last Glacial period. The pollen sequence of the Latest Pleistocene to Holocene reveals the change of vegetation and climate from the pine forests of the Late Glacial period to the climax forests of mangrove and evergreen broad-leaved trees of the Climatic Optimum. It is suggested that the climatic condition in subtropical Ryukyu Islands around 20,000 years B.P.was not so much cool but arid than the climate of the present day.
The potamidid gastropod Telescopium telescopium (Linne) is a representative species of the tropical mangrove molluscan community in the Indo-Western Pacific marine faunal realm. Distribution of the species in the Nansei Islands during the postglacial period is examined on the basis of subfossil materials from raised beach deposits and mud flats of mangrove forests. Telescopium telescopium had been widely distributed in the Nansei Islands from Iriomote-jima to Okinawa-jima around the Holocene Climatic Optimum. However, no living individual is found from mangroves in the islands. A radiocarbon date of a well-preserved dead shell from the Funaura mangrove in Iriomote-jima indicates 330<plus-minus>80y.B.P.Thewefore, the species may have disappeared in the islands since the eighteenth centur
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[Publications] Tomida,Y.,Kawai,K.,Setoguchi,T.and Ozawa,T.: "A new record of Youngofiber (Casteridae : Mammalia) from the Early Miocene of Kani City,central Japan." Bull.Natn.Sci.Mus.,Tokyo,Ser.C,. 21. 103-109 (1995)
Description
「研究成果報告書概要(和文)」より
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[Publications] Shimoyama, S., Matsumoto, N., Kuroda, T., Takemura, K., Hamamoto, R., Mizota, C., Faure, K.and Nishida, T.: "Paleo-environment of the Late Pleistocene in the Chikushi Plain, West Japan." Sci.Repts., Dept.Earth & Planet.Sci., Kyusyu Univ.Vol.19, No.1. 53-79 (1995)
Description
「研究成果報告書概要(欧文)」より
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