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Whale sharks diving behavior results

Results from a recovered pop-up satellite archival tag attached to a 6 m male whale shark (Rhincodon typus) off the Yucatan Peninsula, Mexico. Ambient temperature and depth data recorded by the tag are shown for the entire 31-day track (top). The fast Fourier transform-generated periodogram from an analysis of these same fine-scale depth data are also demonstrated (bottom). The high amplitude peak at 1 cycle per day is indicative of a significant diel rhythm in the vertical movements of this shark.

Submitted by John Tyminski, Mote Marine Lab, Center for Shark Research.