| Project/Area Number |
15405028
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
General fisheries
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| Research Institution | Nagasaki University |
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Principal Investigator |
ISHIMATSU Atsushi Nagasaki Univ., Inst. For East China Sea Res., Prof., 環東シナ海海洋環境資源研究センター, 教授 (00184565)
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| Co-Investigator(Kenkyū-buntansha) |
NATSUKARI Yutaka Nagasaki Univ., Fac. of Fish., Prof., 水産学部, 教授 (10039729)
KOYAMA Jiro Kagoshima Univ., Fac. of Fish., Prof., 水産学部, 教授 (50336327)
TAKEDA Tatsusuke Kyushu Univ., Fac. of Agr., Assoc.Prof., 農学部, 助教授 (30091367)
SOYANO Kiyoshi Nagasaki Univ., Inst. For East China Sea Res., Assoc.Prof., 助教授 (80260735)
TAKAGAKI Tsuyoshi Nagasaki Univ., Grad. School of Sci. & Tech., Assist.Prof., 生産科学研究科, 助手 (50363479)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥12,200,000 (Direct Cost: ¥12,200,000)
Fiscal Year 2005: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2003: ¥5,700,000 (Direct Cost: ¥5,700,000)
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| Keywords | Mudskippers / Periophthalmus / Boleophthalmus / Tidalflat / Hibernation / Biodiversity / Korea / Life history / 生態系 |
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| Research Abstract |
The following points have been clarified through the 3 year project.
1. Analysis of mitochondrial DNA of the mudskipper Boleophthalmus pectinirostris collected in Japan, Korea and China demonstrated that the Japanese population had been isolated from the populations of the Asian continent through geological isolation. Most of the Japanese species have been considered to have isolated from the mother populations in the Asian continent approximately 15,000 years ago, however, the isolation of the mudskipper is estimated to have occurred in much earlier time, 240,000-2,650,000 years ago.
2. Measurements of endocrine disrupting substances in several locations along Korean coast indicated that lake Shiwa and adjacent locations are heavily contaminated by chemicals that exert female-hormone-like actions contained in sewage water from highly populated and industrialized areas.
3. Body composition analysis of the mudskippers collected in Yoesu estuaries shortly before hibernation period demonstrated liver weight and body fat content, which are 2.5 times higher than those observed for Japanese individuals. Hibernation period in Korean south coasts is estimated to be 2 months longer than in Japan, and the high fat content of the Korean fish is an adaptation for the storage of body energy to reduce morality during hibernation periods.
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