Kagari Aoki
University of Tokyo
OceanographyGeologyNeutral buoyancyAquatic animalData loggerForagingPredationEcologySeawaterMarine engineeringSperm whaleDeep divingDescent (aeronautics)Humpback whaleWhaleCetaceaBottlenose whaleSpermElephant sealBody densityGlobicephala melasHyperoodon ampullatusBody conditionSwimming speedEnvironmental scienceFisheryBuoyancyDragBasal metabolic rateBiologyZoologyAtmospheric sciencesBaleenUnderwater
26Publications
12H-index
585Citations
Publications 26
Newest
#1Kagari Aoki (UTokyo: University of Tokyo)H-Index: 12
#2Yurie Watanabe (Whale Museum)H-Index: 1
Last. Kentaro Q. Sakamoto (UTokyo: University of Tokyo)H-Index: 17
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Heart rate monitoring in free-ranging cetaceans to understand their behavioural ecology and diving physiology is challenging. Here, we developed a simple, non-invasive method to monitor the heart rate of cetaceans in the field using an electrocardiogram-measuring device and a single suction cup equipped with an electrode. The unipolar suction cup was placed on the left lateral body surface behind the pectoral fin of Risso's dolphins (Grampus griseus) and a false killer whale (Pseudorca crassiden...
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Summary Advances in biologging technology have enabled 3D dead-reckoning reconstruction of marine animal movements at spatiotemporal scales of meters and seconds. Examining high-resolution 3D movements of sharks (Galeocerdo cuvier, N = 4; Rhincodon typus, N = 1), sea turtles (Chelonia mydas, N = 3), penguins (Aptenodytes patagonicus, N = 6), and marine mammals (Arctocephalus gazella, N = 4; Ziphius cavirostris, N = 1), we report the discovery of circling events where animals consecutively circle...
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#1Andreas FahlmanH-Index: 30
#2Kagari Aoki (UTokyo: University of Tokyo)H-Index: 12
Last. Danuta M. WisniewskaH-Index: 13
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#5Koji Sato (UTokyo: University of Tokyo)H-Index: 100
Abstract Animal-borne video loggers are powerful tools for investigating animal behaviour because they directly record immediate and extended peripheral animal activities; however, typical video loggers capture only a limited area on one side of an animal being monitored owing to their narrow field of view. Here, we investigated the resting behaviour of humpback whales using an animal-borne omnidirectional video camera combined with a behavioural data logger. In the video logger footage, two non...
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Monitoring the body condition of free-ranging marine mammals at different life-history stages is essential to understand their ecology as they must accumulate sufficient energy reserves for surviva...
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#8Koji Sato (UTokyo: University of Tokyo)H-Index: 100
: Central place foraging theory (CPF) has been used to predict the optimal patch residence time for air-breathing marine predators in response to patch quality. Humpback whales (Megaptera novaeangliae) forage on densely aggregated prey, which may induce drastic change in prey density in a single feeding event. Thus, the decision whether to leave or stay after each feeding event in a single dive in response to this drastic change, should have a significant effect on prey exploitation efficiency. ...
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#1Saana Isojunno (Sea Mammal Research Unit)H-Index: 12
#2Kagari Aoki (UTokyo: University of Tokyo)H-Index: 12
Last. Patrick J. O. Miller (Sea Mammal Research Unit)H-Index: 43
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Air-breathing marine predators that target sub-surface prey have to balance the energetic benefit of foraging against the time, energetic and physiological costs of diving. Here we use on-animal data loggers to assess whether such trade-offs can be revealed by the breathing rates (BR) and timing of breaths in long-finned pilot whales (Globicephela melas). We used the period immediately following foraging dives in particular, for which respiratory behavior can be expected to be optimized for gas ...
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#10Koji Sato (UTokyo: University of Tokyo)H-Index: 100
Many baleen whales undertake annual fasting and feeding cycles, resulting in substantial changes in their body condition, an important factor affecting fitness. As a measure of lipid-store body condition, tissue density of a few deep diving marine mammals has been estimated using a hydrodynamic glide model of drag and buoyancy forces. Here, we applied the method to shallow-diving humpback whales (Megaptera novaeangliae) in North Atlantic and Antarctic feeding aggregations. High-resolution 3-axis...
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#2Koji Sato (UTokyo: University of Tokyo)H-Index: 100
The US Office of Naval Research and Strategic Environmental Research and Development Program (SERDP) supported the fieldwork as a part of the 3S study collaboration. This study was also supported by the program Bio-Logging Science of the University of Tokyo (UTBLS).
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There was an error published in J. Exp. Biol. 219 , [2458-2468][1]. Eqn 1 was presented incorrectly. A ‘−1’ was missing after the ratio of densities, and the subscript of the first instance of the density of seawater (ρsw) was given incorrectly as ‘w’ instead of ‘sw’. The original
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