| Project/Area Number |
15K00565
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Environmental impact assessment
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| Research Institution | Shinshu University |
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Principal Investigator |
Nakano Mayu 信州大学, 理学部, 日本学術振興会特別研究員 (00432170)
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| Project Period (FY) |
2015-04-01 – 2019-03-31
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| Project Status |
Completed (Fiscal Year 2018)
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| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2015: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 淡水魚 / 種間競争 / 代替繁殖戦術 / 遊泳能力 / 止水適応 / 遺伝的撹乱 / モツゴ属魚類 / 国内外来種 / 絶滅危惧種 / 繁殖形質 / 行動形質 / 種の置換 / マイクロサテライト / 種間比較 / 遊泳行動 / マイクロサテライト解析 / 分散形質 |
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| Outline of Final Research Achievements |
The results of interspecies comparison obtained in this study supported the replacement of species from Pseudorasbora pumila to P. parva, which occur in all eastern Japan. It has been strongly suggested that 1) P. parva steadily increase the number of offspring by using the spawning substrate which is not used by P. pumila, and 2) sneaking as alternative tactics is more likely to occur in P. parva than P. pumila, and P. pumila is one-sided reproductive interference from P. parva, 3) P. parva has better swimming ability in running water environment than P. pumila, and P. pumila would adapt to standing water environment more than P. parva, and 4) P. parva is suffered significant genetic assimilation between domestic and foreign strains, and the genetic diversity of P. pumila has been extremely low.
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| Academic Significance and Societal Importance of the Research Achievements |
種の置き換わりが、在来種のみならず、在来生態系を構成する様々な生物に影響を及ぼす可能性についてはあまり言及されることはない。ニッチの類似性は置き換わりを促す重要な要因の一つと考えられるが、種間比較によって浮き彫りになる種間差もまた急速な定着を可能とさせる要因となりうる。今後は、侵入した種が在来種の役割を包括的に代替するわけではなく、在来生態系を改変しながら分布拡大していることも念頭に起きながら、希少種シナイモツゴの保全や外来種モツゴの防除といった生物多様性の保全の研究に取り組む必要があると考えられる。
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