Figure 1.
Tidal and Circadian Control of Behavior and Physiology in Eurydice
(A) Shore-caught Eurydice show robust circatidal swimming in DD. An individual actogram, double plotted on 12.4 hr time base over 7 days, is shown.
(B) The same data as in (A) double-plotted on a 24 hr time base to show more clearly the daily modulation of swimming episodes.
(C) Periodogram for the animal in (A) and (B). Red line, p < 0.001 level.
(D) Dorsal chromatophores of Eurydice and respective pigment dispersion index scale I to V.
(E) Chromatophores of animals from the beach show pigment dispersion during the day (mean + SEM, F1,145 = 2.13, p = 0.003).
(F) Chromatophore pigment dispersion (mean + SEM) in Eurydice removed from the shore and released into DD. Gray/black bars show expected light regime on the home beach (see also Figure S1).
(G) Chromatophore pigment dispersion (mean + SEM) in Eurydice entrained in reversed LD 12:12 and released into DD.
(H) The tidal clock is temperature compensated. The period of swimming rhythms in beach-caught animals free running at 11°C, 17°C (ambient seawater temperature) and 21°C is shown. The red dotted line indicates a 12.4 hr period (mean + SEM, n = 32–58).
(I) The daily modulation of tidal activity is temperature compensated (MI data mean + SEM, n = 32–58).
See also Figure S1.