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Ontogeny of circadian rhythm in honey bee locomotor behavior. Representative actograms (Left) and periodogram analyses (Right) for two unrelated bees. Brackets indicate the arrhythmic and rhythmic portions of each actogram, as determined by eye, with a periodogram for each portion. Arrows on (double-plotted) actograms indicate the onset of circadian rhythm. A significant (P = 0.01) circadian rhythm is indicated by a peak above the diagonal line on the periodogram.
