| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Outline of Final Research Achievements |
In Lake Izunuma, a shallow lake in Miyagi prefecture, the expansion of lotus vegetation caused oxygen-depleted lake water recently. In the lotus vegetation, methane diffused into lake water from the sediments and was accumulated in the lower layers during summer period. From the bacterial community analysis using the environmental DNA, the methane oxidizing bacteria which could grow in lake water were detected, and the changes in bacterial community corresponded to methane concentration and water temperature. Since carbon stable isotope ratios of zooplankton and fishes were depleted during summer period, it is suggested that methane food web originated from biogenic methane and methane oxidizing bacteria may be expanding to lake water environments.
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