Food web analyzes in the recent past 100 years
Food web analyzes in the recent past 100 years
批准号:
08454165
负责人:
WADA Eitaro
金额:
$4.1万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for Scientific Research (B)
财政年份:
1996
资助国家:
日本
项目状态:
已结题
起止时间:
1996 至 1997
中文摘要
水生生态系统食物网结构的重建是同位素生态学研究的热点。在此背景下,本项目开展了一项开创性的研究,重点是在这五十年中收集的生物鱼类标本。结果总结如下:1)发现用福尔马林固定生物标本会改变肌肉δ ^<13>C,但不会改变相应的δ ^<15>N。2)近50年来贝加尔湖Omul尺度(Coregonus autumn alis migratorius, Georgi) δ ^<13>C明显减少,反映了大气二氧化碳δ ^<13>C的减少。此外,三角洲^<15>N和三角洲^<13>C的时间变化表明了远洋和沿海食物网之间的栖息地变化。3)对琵琶湖Isaza鱼类和沉积物岩心进行了近50年来的研究,重点研究了它们的三角洲^<15>N的变化。近30年来,随着琵琶湖富营养化的发展,Isaza鱼类的三角洲^<15>N和沉积有机质均有所增加。
英文摘要
Reconstruction of food web structure in aquatic ecosystems is the current topics in the field of isotope ecology. In this context, a pioneering study was carried out in this project with emphasis on biological fish specimen collected during these fifty years.Results were summarized as following items.1)The fixation of biological specimen by formalin was found to change muscle delta^<13>C but not for its corresponding delta^<15>N.2)Omul scale(Coregonus autumalis migratorius, Georgi)collected from Lake Baikal during these fifty years exhibited the clear cut decrease in its delta^<13>C reflecting the decrease in delta^<13>C of atmospheric carbon dioxide. Furthermore, temporal variation of its delta^<15>N and delta^<13>C suggested the habitat changes of Omul between the pelagic and coastal food web.3)In Lake Biwa, Isaza fish and sediment core were studied with emphasis on the changes in their delta^<15>N during these fifty years. Both the delta^<15>N of Isaza fish and sedimentary organics increased during last thirty years corresponding to the development of eutrophication in Lake Biwa.
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Wada, E.: "The abundance of ^<15>N in N_2O in aquatic ecosystems with emphasis on denitrification" Mitt.Internat.Verein.Limnol.Mitteilungen. 25. 115-123 (1996)
Wada, E.:“水生生态系统中 N_2O 中 ^<15>N 的丰度,重点是反硝化”Mitt.Internat.Verein.Limnol.Mitteilungen。
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通讯作者:
Ohkouchi, N.and Wada, E.: "Secular variations of sedimentary organic delta^<13>C during the last 35 Ma in the tropical Atlantic, Site 925" Proceedings of Ocean Drilling Program Scientific Results. 154. 501-505 (1997)
Ohkouchi, N.和 Wada, E.:“热带大西洋过去 35 Ma 期间沉积有机三角洲 ^ 13 C 的长期变化,Site 925”海洋钻探计划科学结果论文集。
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Hanba,Y.T.and Wada,E.: "Solar Radiation Affects Modern Tree-Ring δ^<13>C" Isotopes Environ.Health Stud.32. 55-62 (1996)
Hanba, Y.T. 和 Wada, E.:“太阳辐射影响现代树木年轮 δ^<13>C”同位素环境健康研究 32 (1996)。
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Hanba, Y.T.and Wada, E.: "Solar Radiation Affects Modern Tree-Ring delta^<13>C : Observations a Cool-Temperate Forest in Japan" Isotopes Environ.Health Stud. 32. 55-62 (1996)
Hanba, Y.T. 和 Wada, E.:“太阳辐射影响现代树轮三角洲^<13>C:日本冷温带森林的观测”同位素环境健康研究中心。
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Minoura,K., Wada,E., 他2名: "Late Pleistocene-Holocene paleoproductivity circulation in the Japan Sea : sea-level control on. δ^<13>C and δ^<15>N records of sediment organic material" Palaeography,Palaeoclimatology,Palaeoecology. 135. 41-50 (1997)
Minoura, K.、Wada, E. 和另外 2 人:“日本海晚更新世-全新世古生产力循环:海平面对沉积物有机物质 δ^<13>C 和 δ^<15>N 记录的控制” 古文字学、古气候学、古生态学。 135. 41-50 (1997)
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共 19 条
Construction of a resource model for in East Asia with emphasis on human activities.
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负责人:WADA Eitaro
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依托单位:
海外基金