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Endogenous Circatidal Locomotor Rhythms (1.) The effects of specific stimuli on locomotor activity Many other marine species, especially intertidal crabs, exhibit tidally organized behaviors and some of these activities have been shown to be under the control of endogenous circatidal and/or circadian clocks. Below is evidence that the locomotor activity of adult L. polyphemus is endogenously controlled on a circatidal basis. |
Figure 1: Free-running locomotor activity rhythms of two individual L. polyphemusexposed to LD 14:10 that indicate clear tidal patterns of activity (left panels). Data are double-plotted to facilitate visual inspection. Periodogram analyses of sections of the actograms (separated by horizontal bar) are presented in the right panels. The two different LD sections of the bottom actogram were analyzed separately to illustrate either free-running (LD1) or entrained (LD2) periods. |
