Fig. 2

Actograms and chronobiological analyses of O. edulis valve activity. Actograms of mean VOA (left panel) and VOD (right panel) during the 11 series, 97 days in total (n = 16–32). Each actogram of each series is associated the Lomb & Scargle periodogram (LS) performed on binary data and characteristics of the Cosinor model: the period (h) ± SE, the p-value and the percent rhythm (PR, %). The red line on the LS periodogram indicates a threshold of significance (p = 0.95). The rhythm is considered significant for the Cosinor model with p < 0.05. On actograms, dark grey areas = scotophase, white areas = photophase, yellow area = dim light exposure, green area = continuous food supply. The 11 series are detailed in Fig. 1B.