Fig. 2
From: The bear circadian clock doesn’t ‘sleep’ during winter dormancy
a,d Actogram- and b,e Tempogram-style plots from a captive juvenile (male) and adult (female) grizzly bear. Each black mark represents and activity bout or temperature change (see Methods for details). Actograms and tempograms are double-plotted to more easily observe trends across days. Thus, each row represents two days of data with the second day re-plotted on the row underneath the previous day and so on. Regions indicated by the red dashed boxes are re-plotted in the middle column as daily mean activity or Tb profiles (averaged over the time-frame corresponding to the boxed region) and in the right column as scalograms. The scalograms reflect the day-to-day changes in period length (black/white horizontal line near 24 h period) and rhythm amplitude (heat map color). Actogram data extend from the pre-dormancy period (white background) through winter dormancy (gray background) whereas the tempogram data begin at dormancy (red triangle) onset and extend for various times in winter dormancy. c,f Expanded view of the winter dormancy periods shown in Panels a and d illustrating the times when light pulses where applied (white boxes). Boxed areas are re-plotted as scalograms in the right column and correspond to each numbered box. Asterisks indicate the onset of light pulses. FRP – Free running period