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Figure 4 | Journal of Circadian Rhythms

Figure 4

From: Natural daylight restricted to twilights delays the timing of testicular regression but does not affect the timing of the daily activity rhythm of the house sparrow (Passer domesticus)

Figure 4

Daily activity profile (counts per minute, mean ± SE, n = 7) of sparrows for the period when they were exposed to NDL during twilight periods alone along with 4 days before and after the twilight exposure (i.e., when they received NDL all day). Note the difference in amplitude of the daily activity rhythm between NDL and NDL minus daylight conditions.

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