Rhythms during the polar night: evidence of clock-gene oscillations in the Arctic scallop Chlamys islandica
Arctic regions are characterized by drastic seasonal changes in light intensity and duration with extended periods of permanent light or darkness. The circadian clock, an internal time-keeping system, regulates various physiological processes through the generation of approximately 24-hour circadian rhythms in gene expression. This clock needs to be entrained by external cues, for example light, t