Upper figure was illustrated using NaLV developed by K. Suzuki and T. Simizu.
Reconstruction of three dimensional moving paths of green turtle.
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| Abstract |
| To
reconstruct three-dimensional moving paths of green turtles, we developed
the magneto-resistive acceleration logger (MR-logger) to record geomagnetic
field and acceleration. Field experiments were conducted in Huyong Island,
Thailand. The MR logger and a Speed/ Depth/ Temperature logger (PDT logger)
were attached on a carapace of a female green turtle nested on the beach in
the Huyong Island. Sampling frequencies of the data loggers were 10 Hz for
the MR logger and 1 Hz for the PDT logger. The 3-D moving paths of the green
turtle were reconstructed by her horizontal body directions, vertical tilt
angles and swimming speeds. The horizontal body directions of the green
turtle were calculated from the surging and swaying geomagnetic field. The
vertical tilt angles of the green turtle were calculated from the surging
acceleration. Upper figure was illustrated using NaLV developed by K. Suzuki and T. Simizu. |