| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2014: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
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| Outline of Final Research Achievements |
Dynamics of trace arsenate and phosphate in the subtropical Pacific Ocean were investigated using a highly sensitive spectrophotometry. Concentration ratios of arsenate to phosphate were significantly higher in the phosphate-depleted western subtropical North Pacific than the other subtropical regions, suggesting that arsenate influences on the growth of microorganisms in the western subtropical North Pacific. However, arsenate-enrichment incubation experiments in the western subtropical North Pacific revealed that arsenate addition did not induce significant variations in its assimilation, organic matter production, and community structure. This result implies that microorganisms in the phosphate-depleted marine environments have a high tolerance for the arsenate as a toxic substance and their growth is not particularly supported by the arsenate as an alternative of phosphate.
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