| Budget Amount *help |
¥15,860,000 (Direct Cost: ¥12,200,000、Indirect Cost: ¥3,660,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2017: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
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| Outline of Final Research Achievements |
In this study, we measured mercury stable isotope ratios of marine pelagic fishes and dolphins from Northwest Pacific Ocean to constrain the geochemical cycle of Hg in this region, and to assess the applicability of mercury stable isotope ratios to ecological studies. Following topics have been examined, (1) Hg stable isotope variation in skipjack tuna collected from various regions of the Northwest Pacific Ocean, (2) mass balance model of Hg bioaccumulation to skipjack tuna, and (3) mechanism of mercury accumulation to marine mammals. The comprehensive data interpretation of previous studies was also conducted to evaluate potential of Hg isotope as the tracer of Hg flow analysis from the environment to humans.
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