ID | 117885 |
Title Alternative | 再蛇行化に伴う魚類の応答
Effects of a re-meandering project on the physical habitats and fish in the Shibetsu River
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Author |
Kawaguchi, Yôichi
Public Works Research Institute
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Nakamura, Futoshi
Hokkaido University
Kayaba, Yuichi
Public Works Research Institute
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Keywords | fish community
lentic fish
lotic fish
oxbow lake
rehabilitation
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Content Type |
Journal Article
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Description | We investigated effects of experimental channel re-meandering on river ecosystem in lower reaches of the Shibetsu River, Hokkaido, northern Japan. Field samplings before and after re-meandering were conducted to compare fish species abundance and physical conditions of instream habitat to those in a straightened main channel (control reach). The reach used for re-meandering, an isolated old channel of the river, had been a stagnant lentic zone. Physical conditions in the past channel therefore were extremely different from those in control reach. Whereas a large number of lentic fish and crustaceans were found in past channel, only a few lotic fish were found in control reach. After re-meandering, physical conditions of past channel were dramatically changed and showed similar depth and velocity distributions to those in control reach. Re-meandering also greatly lowered lentic fish abundance. On the other hand, many masu salmon were also found in re-meandering reach. We recorded large-sized salmonids at a concave part of re-meandering reach, which were not found in control reach. The channel re-meandering improved its planar geometries and successfully restored diverse instream habitats complex in longitudinal and cross sectional structure. However, unlike past channel, limited availability of slow-flow habitats in re-meandering reach hindered lentic species to colonize.
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Journal Title |
Ecology and Civil Engineering
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ISSN | 13443755
18825974
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NCID | AA11528360
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Publisher | 応用生態工学会
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Volume | 7
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Issue | 2
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Start Page | 187
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End Page | 199
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Published Date | 2005-01-30
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Remark | 特集:標津川再生事業の概要と再蛇行化実験の評価
Feature: Shibetsu River Restoration Project |
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language |
jpn
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Publisher
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departments |
Science and Technology
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