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Fig. 5. Separate analyses of serotonin (5-HT) levels in individual regions of the
brains of juvenile lobsters that were entrained to a 12 h:12 h L:D light
regime followed by 3 days in D:D. Chronograms on the left show the raw data
collected from four individuals at each time point (values for some
measurements were the same and so appear as a single point). Chronograms on
the right show the arithmetic means (±
S.E.M.) of the data. All measurements were
made from animals that had been in constant darkness for 3 days. The most
distinctive aspect of the serotonin levels of the olfactory lobe (OL) and the
brain remainder (consisting of the protocerebral and tritocerebral areas, the
medial deutocerebral regions, the lateral antennular neuropil, the medial
antennular neuropil, the olfactory globular tract and the antenna II neuropil)
is the abrupt rise to a peak that occurs prior to subjective dusk followed by
an exponential-like decay (A,B,D,E). By contrast, serotonin levels in the
accessory lobes (ALs) rise during the subjective day to a high around dusk,
are sustained throughout the night hours and fall at subjective dawn (C,F)
(N=4 for each time point). t-tests between the peaks and
troughs in serotonin levels show significant differences in each of these
brain regions (AL, P=0.016; OL, P=0.029; brain remainder,
P=0.00034).
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