Figure 2.

Circadian clock genes expression is affected by the lunar cycle or laboratory conditions mimicking moonlight cues. Gray areas on the left of each panel describe the environmental conditions or laboratory experimental settings employed. Green circles indicate experiments conducted under natural conditions, whereas orange circles refer to artificial (lab) experimental conditions. (A) The expression of A. millepora cry1, cry2, clk, and cyc is influenced by the lunar cycle. (B) Expression of a set of clock genes in P. dumerilii is regulated by an endogenous circalunar clock, as shown by experiments under lunar free-running conditions (absence of artificial moonlight cue at night). (C) Altered night illumination affect the expression of clock genes in a lunar phase-dependent manner in S. guttatus. For references, see [[26], [27], [28], [29]].