| Project/Area Number |
26660156
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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 |
Aquatic bioproduction science
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| Research Institution | Kitami Institute of Technology |
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Principal Investigator |
Matsumoto Kei 北見工業大学, 工学部, 研究員 (90507170)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAYAMA Keisuke 神戸大学, 工学(系)研究科(研究院), 教授 (60271649)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Project Status |
Completed (Fiscal Year 2015)
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| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2014: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | シロザケ産卵河川 / オオワシ / 安定同位体比 / レーダー観測 / 海由来栄養 / シロザケ産卵場 / 産卵河川 / 越冬環境 / 採餌環境 / シロザケ自然産卵 / 衛星追跡型発信機 / 回収型記録装置 / 寒冷地生態系 / シロザケ野生魚 |
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| Outline of Final Research Achievements |
In winter, although Steller’s sea eagles can be seen at salmon spawning sites in Hokkaido, little is known for their potential as a field indicator which allows us to estimate the salmon abundance. In this study, we examined temporal and spatial distribution of eagles along the salmon spawning river in eastern Hokkaido. More eagles occurred in the riparian forests in relation to salmon abundance. The spatial patterns of eagles were matched the results from radar observations beside the spawning sites. We also tested how the salmon runs and eagle’s consumption affected on marine derived nutrient inputs into the terrestrial ecosystem based on the use of stable isotope signature (δ15N, δ13C) of terrestrial plants. Stable isotope ratios of plants from spawning sites were higher than those from non-spawning sites. Thus, eagle occurrences and stable isotope signature can be the index of salmon abundance in the spawning rivers.
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