Environmental monitoring of mesopelagic ecosystem using marine top predators as an indicator
| Project/Area Number |
17K12813
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Environmental dynamic analysis
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Aoki Kagari 東京大学, 大気海洋研究所, 助教 (60526888)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Keywords | 鯨類 / 高次捕食者 / 採餌生態 / 肥満度 / 浮力 / 海洋生態系 / バイオロギング / 海生哺乳類 / 移動 / 採餌行動 / 体密度 / マッコウクジラ / ヒレナガゴンドウ / データロガー / 中深層生態系 / コビレゴンドウ / 環境変動 |
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| Outline of Final Research Achievements |
Behavioral responses and body conditions of marine top predators can be good indicators of environmental changes in marine ecosystem. For example, animals might change their behaviors (e.g. time spend for feeding, timing of migration) in response to environmental changes. The body condition of top predators can also be an indicator of habitat health. In this study, we focused on the following three topics to establish a method to measure the environmental responses of cetaceans. 1) monitoring feeding behavior of toothed whales using animal-born recorders 2) estimating migration routes of sperm whales 3) estimating temporal changes in lipid-store body condition of humpback whales at feeding grounds using aerial photogrammetry and tag-derived tissue density.
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| Academic Significance and Societal Importance of the Research Achievements |
陸上に比べて海洋では、 動物が変化する環境にどのように応答するのか、把握することは難しい。人間が考える問題と、動物にとっての問題は異なる可能性がある。動物に記録計やビデオカメラを装着して、動物目線でその行動を記録するバイオロギング手法は、動物の環境応答を直接計測できる。本研究では、バイオロギング手法を用いて、海洋の高次捕食動物である鯨類の捕食行動、季節や海域、年による肥満度の違いを把握することを示した。
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Report
(4 results)
Research Products
(16 results)
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[Journal Article] Body density of humpback whales (Megaptera novaengliae) in feeding aggregations estimated from hydrodynamic gliding performance2018
Author(s)
Tomoko Narazaki, Saana Isojunno, Douglas P Nowacek, Rene Swift, Ari S Friedlaender, Christian Ramp, Sophie Smout, Kagari Aoki, Volker B Deecke, Katsufumi Sato, Patrick JO Miller.
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Journal Title
PLOS ONE
Volume: 13
Pages: 0200287-0200287
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Presentation] Photogrammetry supports tag-derived tissue density as a proxy for body condition: Seasonal and locational changes in body condition of humpback whales on their feeding grounds.2019
Author(s)
Aoki K, Isojunno S, Charlotte B, Iwata T, Kershaw J, Martin Lopez LM, Ramp C, Biuw M, Akiyama Y, Swift R, Wensveen P, Narazaki T, Sato K, Miller PJO.
Organizer
The 23nd Biennial Conference on the Biology of Marine Mammals, Spain, December 2019
Related Report
Int'l Joint Research
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