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誠, 有賀; 裕一, 津田; 紘, 藤岡; 健太郎, 本多; 靖, 光永; 孝二, 三原; 和士, 宮下

doi:10.3825/ece.12.119

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…The transmitter is less expensive than a GNSS receiver and compact and lightweight transmitters are being commercialized. Transmitters have been used to survey fishes [6][7][8], turtles [9], and rodents [10], and it is becoming possible to attach them to small amphibians, such as frogs, if the individual size is selected. However, the range of radio waves is limited, and some terrains block these radio waves, making the process of tracking time-consuming and labor-intensive.…”

Section: Introductionmentioning

confidence: 99%

Verification of the Detection Performance of Drone Radio Telemetry for Tracking the Movement of Frogs

Niwa

Sawai

2021

Drones

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Elucidating the various behavioral and ecological uses of animal habitats is the basis for the conservation and management of animal species. Therefore, tracking the movement of animals is necessary. Biotelemetry is used for tracking the movement of animals. By mounting a radio telemetry receiver and antenna on a drone, the time and labor required for surveying animals can be reduced. In addition, it is easy to track difficult-to-reach areas such as rice paddies and forests, and the environment is not invaded by the survey. We think that this drone radio telemetry will be the best method for tracking the movement of small amphibians, such as frogs. However, in order to put the method to practical use, the accuracy of the system needs to be verified. Approximately 26 ha of area in Sogabe, Kameoka City, Kyoto Prefecture, Japan was investigated in this study. We selected and validated the location where frogs are likely to enter farmlands. The location where the detection of movement is expected to be stable are 5 cm deep areas in the soil, gaps in masonry, and under plastic bags, whereas areas in which the detection is likely to be unstable are areas deeper than 5 cm in the soil, covered concrete channels, and grass. By calculating the geographic center, the location of the nanotag could be estimated with an accuracy of less than 16 m. We successfully showed that the drone radio telemetry system used in this study is capable of detecting and tracking the movement of animals with high spatial and temporal resolutions. However, we suggest that the detection of movement may be interrupted depending on the location of the target animal and more than three detections are needed to guarantee the accuracy of the estimation.

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Section: Introductionmentioning

confidence: 99%

Verification of the Detection Performance of Drone Radio Telemetry for Tracking the Movement of Frogs

Niwa

Sawai

2021

Drones

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Migratory patterns of exotic brown troutSalmo truttain south‐western Hokkaido, Japan, on the basis of otolith Sr:Ca ratios and acoustic telemetry

Honda

Arai

Kobayashi

et al. 2012

Journal of Fish Biology

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Acoustic telemetry and microchemical analysis of otolith strontium-calcium ratios were used to evaluate how exotic brown trout Salmo trutta have responded to Japanese riverine environments of south-western Hokkaido by observing their migratory patterns. The existence of anadromous S. trutta was also verified. Most S. trutta caught in rivers for otolith analysis were freshwater residents (95·6%), whereas those caught in the sea were mainly smolts (91·3%), which had just migrated from rivers during spring. Anadromous S. trutta (n = 6) were captured in rivers and in the sea, confirming the existence of mature pre- and post-spawning fish. According to telemetry results, both mature and immature S. trutta used the river in winter, and their estimated sea-run timings showed individual differences. Through the combination of these two methods, migratory patterns on various spatio-temporal scales were observed. This first documentation of the presence of both male and female anadromous S. trutta in the same region within Japan indicated the risk of further colonization of exotic S. trutta via oceanic migration.

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Ascending speed and nocturnal activity of adult masu salmon (Oncorhynchus masou Brevoort) during upstream migration

Ohkuma

Abe

Kagaya

et al. 2020

Journal of Fish Biology

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We released five adult masu salmon (Oncorhynchus masou) tagged with external transmitters to track their ascending behaviour. The signals of all specimens were recorded in the upper area of the river system. Two patterns of ascending behaviour were recognized: ascending upward immediately after release and ascending during increased river discharge. The fastest ascending speed was about 1000 m h-1. Active movements were detected at night. The signal recording duration at each receiver for each fish was generally brief. Most fish did not stay at the pools where the receivers were installed.

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Cited by 4 publications

References 16 publications

Verification of the Detection Performance of Drone Radio Telemetry for Tracking the Movement of Frogs

Verification of the Detection Performance of Drone Radio Telemetry for Tracking the Movement of Frogs

Migratory patterns of exotic brown troutSalmo truttain south‐western Hokkaido, Japan, on the basis of otolith Sr:Ca ratios and acoustic telemetry

Ascending speed and nocturnal activity of adult masu salmon (Oncorhynchus masou Brevoort) during upstream migration

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