2021 Fiscal Year Final Research Report
| Project/Area Number |
17H03725
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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 | 一般 |
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| Research Field |
Ecology/Environment
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| Research Institution | Hokkaido University |
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Principal Investigator |
Kishida Osamu 北海道大学, 北方生物圏フィールド科学センター, 准教授 (00545626)
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| Project Period (FY) |
2017-04-01 – 2022-03-31
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| Keywords | 生活史 / 表現型可塑性 / サイズ / 食う―食われるの関係 / 回遊 |
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| Outline of Final Research Achievements |
Novel findings about the context-dependence and function of individual growth of animals were obtained from studies using larval amphibians and fish. Our studies using amphibian larvae have shown that positive feedback between consumption and growth, in which individuals who consumed large prey grew faster and then consumed more larger preys to result in further growth, is regulated with the presence of other species and with genetic populations. We also found that variation in the feedback between geographic populations of predators explain the variation in their trophic relationship with large heterospecific prey. It advances our understanding of mechanisms of the geographic variation in the dynamics of trophic network. Our studies using migratory fish showed that smaller individuals grew faster and in the longer period before migration and found that this growth patten represents adaptive growth tactics to deal with size-dependent selection in the migration.
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| Free Research Field |
動物生態学
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では個体成長が集団内で大きく異なることのシナリオとメカニズムを明らかにするとともに、成長様式の機能と適応的意義を明らかにした。個体成長は個体サイズを通して個体の生存や繁殖に影響するとともに生物間相互作用を変えることで群集動態に寄与することから、本研究の成果は、いまだほとんどわかっていない生物群集の時間的・空間的な多様性の創出機構の理解に貢献する。さらに本研究では、水産有用種の成長に関して、生活史型とサイズの組み合わせに依存した適応的な様式があることを発見した。この成果は個体の適応戦術に注目することで、水産有用種の個体数管理や効果的かつ持続的利用についての理解が深まることを意味している。
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