Food web analyzes in the recent past 100 years

近100年食物网分析

• 批准号: 08454165
• 负责人: WADA Eitaro
• 金额: $ 4.1万
• 依托单位: KYOTO UNIVERSITY
• 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
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454165/
• 关键词: Ancient lakes; Lake Baikal; Lake Biwa; Reconstruction of food web; delta^<15>N; delta^<13>C; Specimen; Sediment; 近過去生態学; 炭素同位体比; 窒素同位体比; オームル; イサザ

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.

水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，本项目对近50年来采集的生物鱼标本进行了开创性的研究，结果表明：1）福尔马林固定生物标本后，肌肉Δ C发生了变化<13>，但其相应的Δ N没有变化<15>; 2）近50年来采集的贝加尔湖白鲑（Coregonus autumalis migratorius，Georgi）的Δ Δ C明显下降<13>，反映了大气二氧化碳Δ C的下降<13>。此外，其三角洲^<15>N和三角洲^<13>C的时间变化表明，Omul的栖息地之间的浮游和沿海食物网的变化。3）在琵琶湖，Isaza鱼和沉积物芯，重点研究了它们的三角洲^<15>N在这50年的变化。近<15>30年来，随着琵琶湖富营养化的发展，伊萨扎鱼的δ N和沉积物有机质含量均呈上升趋势。

项目成果

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。

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。

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)。

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。

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)