Periodograms from three different colonies
Periodograms from three different colonies. Example of three periodograms from three different colonies (peaks represent polyp expansion), showing endogenous rhythms at 18°C and still-water conditions. On the left the recorded normalised activities (i.e. the number of pixels divided by the maximum polyp expansion for that experiment); on the right the Lomb periodogram with frequencies on the X axis and number of occurrences on the Y axis. Figures close to the peaks indicate the periods. The 3 dashed lines represent the significativity of the peaks, 0.1, 0.01 and 0.001, the smallest value corresponding to the highest significativity.
Figure 2 SEM: Records of individual polyp activity. (
Figure 2 SEM: Records of individual polyp activity. (A) The area below the peaks for a given experiment. (B) The derivative of this curve with absolute values (increase or decrease in polyp expansion). These records usually show a steeper descent after opening.
Corallium rubrum polyp activity at 18°C and 3 cm s-1 current speed
Corallium rubrum polyp activity at 18°C and 3 cm s-1 current speed.