Fig. 6

Timing and frequencies of accelerometer output from a captive Loligo forbesi. a Accelerations and hourly rms values relative to time of day. b Fast Fourier transform of the total acceleration record indicates that 0.8 Hz was the dominant frequency of squid movement during the duration of the tag deployment. The inset figure provides an example of a single bout of finning during the trial (indicated by a red star in a, b), and has the same periodicity (0.8 Hz) as the dominate frequency identified by the FFT. c Histogram of the peak magnitudes of the total acceleration during the duration of the tag deployment. Lower accelerations with a magnitude of 0.02 g were the most prevalent during the recorded behavior, and are most likely the result of finning. Inset in (c) shows how the number of incidences of higher acceleration behaviors (presumably jetting and rapid maneuvering) is much reduced compare to the lower acceleration behaviors of this animal