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Fig. 3. Chronograms in which the serotonin (5-HT) levels in lobster brains measured
by HPLC are shown over a 24-h period, plotted as means ±
S.E.M. All three graphs show the measurements
taken after the animals had been in darkness (D:D) for 3 days without food.
The timing of light-on and light-off experienced by the animals during their
entraining L:D periods is marked by the black triangles. Note that in C
light-off has been shifted by 4 h in time and occurred at 14:00 h. (A) Pooled
data from B and C. (B) Serotonin levels in the brains of juvenile lobsters
that had been maintained for 2 weeks on an entraining 12 h:12 h L:D cycle. (C)
Serotonin levels in brains of animals that had been subjected to a
phase-shifted light cycle. In pooling the data, we matched the subjective
light-on and light-off transitions of the two groups. The pooled data (A) show
a pre-dusk peak and pre-dawn trough [N=8 for each time point; the
peak prior to subjective dusk is significantly different (P=0.039)
from the trough prior to subjective dawn]. (B,C) Plotting the data for the two
groups separately illustrates the phase shift of the peak and trough in the
animals that had been subjected to the shifted light regime (N=4 for
each time point).
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