Katsufumi Sato
University of Tokyo
OceanographyGeologyForagingPredationEcologyGeographyDescent (aeronautics)Environmental scienceFisheryBuoyancyBiologyZoologyUnderwater
188Publications
48H-index
5,389Citations
Publications 188
Newest
#1Shigenori Nobata (UTokyo: University of Tokyo)H-Index: 9
#2Takashi Kitagawa (UTokyo: University of Tokyo)H-Index: 19
Last. Susumu Hyodo (UTokyo: University of Tokyo)H-Index: 31
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The correlations among gonad maturity and various homing behaviors of chum salmon, Oncorhynchus keta, were evaluated using acoustic tracking of tagged fish in Otsuchi Bay, Japan. There was a negative correlation between the time duration from release of tagged fish until river entry and the plasma 17α, 20β-dihydroxy-4-pregnen-3-one (DHP) levels, an indicator of final maturation. Females with high DHP entered the rivers soon after the release, whereas females with low DHP (<10 ng/ml) took a few d...
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#1Lucy A. Hawkes (University of Exeter)H-Index: 24
#2A. FahlmanH-Index: 1
Last. Katsufumi Sato (UTokyo: University of Tokyo)H-Index: 48
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The physiological mechanisms by which animals regulate energy expenditure, respond to stimuli and stressors, and maintain homeostasis at the tissue, organ and whole organism levels can be described...
1 CitationsSource
To measure the heart rate of unrestrained sea turtles, it has been believed that a probe must be inserted inside the body owing to the presence of the shell. However, inserting the probe is invasive and difficult to apply to animals in the field. Here, we have developed a non-invasive heart rate measurement method for some species of sea turtles. In our approach, an electrocardiogram (ECG) was performed using an animal-borne ECG recorder and two electrodes-which were electrically insulated from ...
5 CitationsSource
By describing where animals go, biologging technologies (i.e. animal attached logging of biological variables with small electronic devices) have been used to document the remarkable athletic feats of wild animals since the 1940s. The rapid development and miniaturization of physiologging (i.e. logging of physiological variables such as heart rate, blood oxygen content, lactate, breathing frequency and tidal volume on devices attached to animals) technologies in recent times (e.g. devices that w...
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#1Aran Garrod (UTokyo: University of Tokyo)
#2Sei Yamamoto (UTokyo: University of Tokyo)
Last. Katsufumi Sato (UTokyo: University of Tokyo)H-Index: 48
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The study of seabird behaviour has largely relied on animal-borne tags to gather information, requiring interpretation to estimate at-sea behaviours. Details of shallow-diving birds' foraging are less known than deep-diving species due to difficulty in identifying shallow dives from biologging devices. Development of smaller video loggers allow a direct view of these birds' behaviours, at the cost of short battery capacity. However, recordings from video loggers combined with relatively low powe...
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#1Masaru NaruokaH-Index: 3
#2Yusuke GotoH-Index: 6
Last. Katsufumi SatoH-Index: 48
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#2Masaru Naruoka (JAXA: Japan Aerospace Exploration Agency)H-Index: 3
Last. Katsufumi Sato (UTokyo: University of Tokyo)
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1 CitationsSource
#1Tomoko Narazaki (UTokyo: University of Tokyo)H-Index: 13
#2Itsumi Nakamura (Nagasaki University)H-Index: 5
Last. Katsufumi Sato (UTokyo: University of Tokyo)H-Index: 48
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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...
1 CitationsSource
#1Takashi IwataH-Index: 7
#2Martin BiuwH-Index: 23
Last. Katsufumi Sato (UTokyo: University of Tokyo)H-Index: 48
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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...
1 CitationsSource
#1Chihiro Kinoshita (UTokyo: University of Tokyo)H-Index: 3
#2Takuya Fukuoka (UTokyo: University of Tokyo)H-Index: 7
Last. Katsufumi Sato (UTokyo: University of Tokyo)H-Index: 48
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Animals with high resting metabolic rates and low drag coefficients typically have fast optimal swim speeds in order to minimise energy costs per unit travel distance. The cruising swim speeds of sea turtles (0.5-0.6 m s-1) are slower than those of seabirds and marine mammals (1-2 m s-1). This study measured the resting metabolic rates and drag coefficients of sea turtles to answer two questions: (1) do turtles swim at the optimal swim speed? and (2) what factors control the optimal swim speed o...
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