Appearance process of the Cenozoic cold-water molluscan assemblages in the Japanese Islands

日本列岛新生代冷水软体动物组合的出现过程

• 批准号: 02640606
• 负责人: OGASAWARA Kenshiro
• 金额: $ 1.34万
• 依托单位: The University of Tsukuba (1991-1992)Tohoku University (1990)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02640606/
• 关键词: Cenozoic; Mollusca; Cold-water; Zoogeography; Subarctic; Cooling; Oyashio; Adaptation; 生物地理; 古海洋気候; 竜ノ口動物群; 親潮; 寒冷化; 中新世; 北海道; カムチャッカ; タチカラウシナイ; 志美宇丹; 種分化; 二枚貝; 巻貝

The purpose of this research is to make clear the appearance process of Cenozoic cold-water fauna in the Japanese Islands on the basis of shallow-marine molluscan records. Firstly, the definition of the cold-water realm from zoogeographic point of view has been studied based on modern marine zoogeographic studies in relation to various data of surface temperature. As the result, the relationship between the zoogeographic divisions and annual mean temperature of Northern Pacific can be divided into the Subarctic (less than 8ﾟC), Cool-temperate (14-9ﾟC), Mild-temperate (16-15ﾟC), Warm-temperate (20-18ﾟC) and so on, respectively. Secondly, comparative analysis and interpretations from paleomarine-climatical viewpoint on the Japanese Cenozoic molluscan assemblages have been done based on modern analogous method as referring the characteristic molluscan genera/species of the arctic/subarctic realms. Consequently, it can be concluded that l) the Oyashio-type cold-water mass has not been appeared in Northern Pacific during the Miocene, 2) shallow marine cold-water molluscs have first appeared at latest Plioecne to early Pleistocene time at southern Hokkaido, that are of the cool-temperate origin, and 3) Sea of Japan and Sea of Okhotsk might be addorded the important biotope (biotic places) for such adaptation as from the cool-temperate to subarctic marine conditions corresponding world-wide cooling event towards the Glacial age (Quaternary).

这项研究的目的是在日本群岛根据浅海软体动物记录清楚地清楚日本群岛中新生代冷水动物区系的出现过程。首先，根据现代海洋动物地理学研究，研究了从动物地理学角度来定义冷水领域的定义，该研究与表面温度的各种数据有关。结果，可以将动物地理学划分与北太平洋的年平均温度之间的关系分为亚北极（小于8℃），凉爽的（14-9 c）（14-9 c），温和温和的（16-15 c），温暖 - 温暖（20-18 c）等。其次，基于现代类似方法，对日本新生代软体动物组合的古瘤气候观点的比较分析和解释是指北极/亚北极领域的特征性软体动物属/物种。因此，可以得出结论，l）在中新世期间，北太平洋尚未出现oyashio型冷水质量，2）最初出现在最新的上层到更新时期的浅海冷水软体动物。位置）适应从凉爽到亚北极海洋条件的适应性，与冰川时代（第四纪）相对应的世界冷却事件。

项目成果

Okami, K.: "Geological age and sedimentary environment of the Iioka Formation distributed in eastern marginal part of the Tohoku Backbone range." Prof. Nakagawa, H.Commem.223-234 (1991)

Okami, K.：“分布在东北骨干山脉东缘的饭冈组的地质时代和沉积环境。”

OGASAWARA,K.: "Paleoecological significance of ″Venericardia″(Bivalvia)assemblage from the viewpoint of TethysーPacific commection." Saito Hoーon Kai Spec. Pub.No.3. 507 (1991)

OGASAWARA, K.：“从特提斯－太平洋连接的角度看‘Venericardia’（双壳纲）的古生态学意义。” Saito Hoon Kai Spec. No.3 (1991)

Ogasawara, K.: "Neogene marine sequences and benthic foraminifers." Guidbook for field Excur. C, 4th Internat. Benthic Foram., Sendai. 1-17 (1990)

小笠原 K.：“新近纪海洋序列和底栖有孔虫。”

Ogasawara,K: "Paleozoogeographic significance of Mizuhopecten slodkewitschi Sinelnikova from the Miocene Shibiutan Formation,northern Hokkaido" Sci.Rep,lnst.Geosci,Univ Tsukuba,Sec.B.14. (1993)

Ogasawara,K：“北海道北部中新世 Shibiutan 组中 Mizuhopecten slodkewitschi Sinelnikova 的古动物地理意义”Sci.Rep，Inst.Geosci，筑波大学，Sec.B.14。

Ogasawara, K.: "Neogene paleogeography and marine-climate of the Japanese Islands on the basis of shallow-marine molluscs" Paleogeogr.,Paleoclimatl,Paleoecol.(1993)

小笠原 K.：“基于浅海软体动物的日本列岛的新近纪古地理和海洋气候”Paleogeogr.,Paleoclimatl,Paleoecol.(1993)