2004 Fiscal Year Final Research Report Summary
Meso-pelagic animal behavior study by animal borne camera and 3-D loggers
| Project/Area Number |
14405027
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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 | National Institute of Polar Research |
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Principal Investigator |
WATANABE Kentaro National Institute of Polar Research, Division for Research and Education, Associate Professor, 研究教育系, 助教授 (30132715)
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| Co-Investigator(Kenkyū-buntansha) |
AKIKO Kato National Institute of Polar Research, Division for Research and Education, Research Associate, 研究教育系, 助手 (80261121)
YAN Ropert-Coudert National Institute of Polar Research, Division for Research and Education, Post Doctoral Fellow, 研究教育系, プロジェクト研究員 (90390591)
MIYAZAKI Nobuyuki Univ. of Tokyo, Ocean Research Institute, Professor, 海洋研究所, 教授 (40101464)
SATO Katsufumi Univ. of Tokyo, Ocean Research Institute, Associate Professor, 海洋研究所・国際沿岸海洋研究センター, 助教授 (50300695)
YUTAKA Watanuki University of Hokkaido, Graduate school of agriculture, Associate Professor, 大学院・水産学研究科, 助教授 (40192819)
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| Project Period (FY) |
2002 – 2004
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| Keywords | 3D logger / camera logger / Meso-pelagic fauna / foraging behavior / marine ecosystem / Top predators |
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| Research Abstract |
We developed a new system of animal borne data loggers, camera loggers for estimation of prey distribution and magnetic fields, accelerations, swim speed and depth logger for reconstruction of animal dive paths. We used both systems for Weddell seals in Antarctica to investigate how seals selected foraging depth and foraging sites in relation to prey distribution and how they managed their foraging behavior to maximize their foraging efficiency in relation to dive limit Data showed that prey like animals appeared only bottom of their dive profiles and they straightly approached their dive bottom and returned to the breathing holes whereas they moved around rather randomly indicating that they maximized their foraging time at bottom where more prey are distributed. We also found new fauna beneath the Antarctic shelf ice zone by the Weddell seal borne camera systems. Weddell seals foraged beneath the shelf ice zone of 150m depth and much of suspended benthos under surface of shelf ice was found. This fauna has never reported before. Obtaining these results, we developed further miniaturized camera logger system for penguin deployments. We first used this camera system for Adelie and chinstrap penguins in Antarctica and succeeded to visualize the group foraging behavior under water.
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