| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Outline of Final Research Achievements |
To clarify processes that provide overgrowth of periphyton and disappearance of algivore in dam downstream, both of which are different with stream ecosystems in natural conditions, we conducted laboratory and field manipulation experiments. Drainage of turbid water and absence of bed loads due to dam reservoirs had effects on periphyton, and in some cases the both contributed to overgrowth of periphyton. Disappearance of algivore such as stream insects may result from two factors, scarce of sand which is used as stone case and alteration of periphyton as food resources. In addition, their disappearances triggered overgrowth of periphyton, and thus we showed that the both the overgrowth and the disappearance is closely linked to each other.
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