| Budget Amount *help |
¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000)
Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2011: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2010: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
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| Research Abstract |
The aim of this project is to evaluate ecotoxicological effect of hypoxia-induced mobilization of trace elements from lake/marine sediment. To test this effect, I made field surveys, mainly in the Lake Biwa, coupled with laboratory experiments. The results indicated that (i) mass mortality of an endemic goby fish (isaza) in 2007 could be induced by exposure to Mn and As mobilized from lake sediment, (ii) Mn and As have been accumulated in the thin surface of sediment, and thichness of this enrichment layer is decreasing due to progressive hypoxia. Increasing dissolution flux of Mn and As from sediment can be a cause of adverse effect to lake organism. These result also suggested that similar phenomena is of concerned in other hypoxic water environment in the world.
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