| Budget Amount *help |
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2011: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2010: ¥13,260,000 (Direct Cost: ¥10,200,000、Indirect Cost: ¥3,060,000)
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| Research Abstract |
The aim of this study was to examine the influence of human development of thermal environment of subtropical estuary and evaluate the biological impact by the physicalchanges. The rivers in the Amami Oshima Is. which have contrastive environments in the estuaries were selected as study sites and physical investigation and 3D flow simulation were conducted and the results were compared to clarify characteristic of thermal environment of estuary with tidal flat. An endangered freshwater fish, Plecoglossus altivelis ryukyuensis called “Ryukyu-Ayu” were selected as index of quality of ecological environment which use estuary in their larval stages. Ecological impacts were determined by estimating the field survival rate of the larva in an experimental model and the density of the copepods statistically. With these physical and ecological models, we analyzed predicted effect of tidal flat restoration showed that the restoratio n would result in a two-fold increase in the size of the suitable habitat area.
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