2021 Fiscal Year Final Research Report
Exploring a cause of population decline of sandlances from aestivation: Can the fish copes with global warming?
| Project/Area Number |
19K06226
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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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| Review Section |
Basic Section 40040:Aquatic life science-related
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| Research Institution | Kitasato University |
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Principal Investigator |
Amiya Noriko 北里大学, 海洋生命科学部, 講師 (20588503)
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | 夏眠 |
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| Outline of Final Research Achievements |
It was found that the water temperature around 13-14°C induces the onset of aestivation in the Seto Inland Sea population of the Japanese sandlance. On the other hand, the swimming rate of the fish gradually decreases even they do not enter the aestivation, indicating that the decrease in activity is caused by factors other than temperature. Moreover, some endocrinological substances such as maturation-related GnRH and testosterone, feeding-enhancing MCH and -suppressing leptin are found to be involved in the mechanism of aestivation. Thus the present study focusing on the "aestivation" and "reproduction" revealed the existence of substances that may serve as indicators of dormancy and environmental factors that determine the onset/end of summer sleep in the sandlance.
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| Free Research Field |
水族生理
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| Academic Significance and Societal Importance of the Research Achievements |
夏眠の生理学的指標となる可能性のある物質を示した本研究結果は，イカナゴの夏眠開始/終了時期の予測法の確立に繋がる．またそれにより，イカナゴの減少要因の特定だけではなく，夏眠魚調査を基にした加入量予測の精度の向上にも寄与できる可能性がある．また，夏眠のような一時的な活動の停止は，無脊椎動物から哺乳類まで広く確認されている．したがって本研究の夏眠に関する成果は，夏眠・冬眠・休眠の進化的背景の理解にも繋がり，基礎生物学的にも重要である．
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