| Budget Amount *help |
¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
Fiscal Year 2015: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2014: ¥7,800,000 (Direct Cost: ¥6,000,000、Indirect Cost: ¥1,800,000)
Fiscal Year 2013: ¥10,920,000 (Direct Cost: ¥8,400,000、Indirect Cost: ¥2,520,000)
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| Outline of Final Research Achievements |
Iron is important factor that control growth and metabolism of phytoplankton in natural waters. Therefore, iron chemical dynamics and bioavailablity have been investigated for the last few decades. Yet, effects of water and environmental factors on iron uptake in actual water environment remained largely unclear, partially because humic substances and other water quality factors were not considered in the previous model where synthetic ligands were often used. In this study, kinetic model for iron transformation and bioavailability was developed based on the kinetic data from phytoplankton incubational experiment under actual natural water conditions where concentrations of humic substances and other water quality factors were manipulated. One of results indicated that phytoplankton is capable of acquiring iron at sufficient amount even under the dark condition, as dark reduction in the presence of humic substances sufficiently produces biologically available ferrous iron form.
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