Long-term impacts of forest managements on the river ecosystems using stable nitrogen isotopic ratios of amino acids
| Project/Area Number |
25660120
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Forest science
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| Research Institution | Japan Fisheries Research and Education Agency |
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Principal Investigator |
Togashi Hiroyuki 国立研究開発法人水産総合研究センター, その他部局等, 研究員 (80616110)
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| Project Period (FY) |
2013-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 炭素・窒素安定同位体比 / アミノ酸の窒素安定同位体比 / 放射性炭素14 / 河川生態系 / 水生昆虫 / 森林管理 / 森林 / 安定同位体比 |
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| Outline of Final Research Achievements |
The present study was to clarify the long-term impacts of clear-cutting and replanting on the stream ecosystems using multi-isotopes. Macroinvertebrates were collected in six streams of stand ages from 5 to >90 yr. The mean δ13C values of macroinvertebrates decreased with increasing stand ages. The result indicates the macroinvertebrates in old-stand ages depended more on terrestrial resources. From δ15N of amino acids, it was possible to estimate the contribution rate of aquatic vs. terrestrial resources and the trophic level of each taxon. The Δ14C values of both periphyton and grazers were lower than that of modern atmospheric CO2. These suggest that soil CO2 released by groundwater, and that dissolved inorganic carbon with low Δ14C is incorporated into stream ecosystems. The ecological response in the studied streams to forest managements is much slower than the chemical response. More than 50 yr is required for the food web structure to completely recover from clear-cutting.
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Report
(4 results)
Research Products
(8 results)
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[Journal Article] Terrestrial-;aquatic linkage in stream food webs along a forest chronosequence: multi-isotopic evidence2016
Author(s)
Ishikawa N. F., H. Togashi, Y. Kato, M. Yoshimura, Y. Kohmatsu, C. Yoshimizu, N.O. Ogawa, N. Ohte, N. Tokuchi, N. Ohkouchi, I. Tayasu.
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Journal Title
Ecology
Volume: -
Issue: 5
Pages: 1146-1158
DOI
Related Report
Peer Reviewed / Open Access
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[Presentation] Terrestrial-aquatic linkage on stream food webs along a forest chronosequence: multi-isotopic evidence2015
Author(s)
Naoto F. Ishikawa, Hiroyuki Togashi, Yoshikazu Kato, Mayumi Yoshimura, Yukihiro Kohmatsu, Chikage Yoshimizu, Naoko O. Ogawa, Naohiko Ohkouchi, Nobuhito Ohte, Naoko Tokuchi, Ichiro Tayasu
Organizer
日本生態学会第62回全国大会
Place of Presentation
鹿児島
Year and Date
2015-03-18 – 2015-03-22
Related Report
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