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Thermoperiodic influences on plasma melatonin rhythms in the lizard Tiliqua rugosa: effect of thermophase duration.

Abstract：

:Rhythms of plasma melatonin levels were determined in lizards (Tiliqua rugosa) subjected to a 12 h photocycle (12 h light: 12 h dark) at constant 33 degrees C, and at 7 different thermoperiods (33 degrees C thermophase and 15 degrees C cryophase) whose thermophase duration ranged from 1.5 to 21 h. The melatonin secretion rate, as measured by the amplitude and duration of elevated melatonin levels and the area under the curve, was maximal at thermoperiods whose thermophase was between 9 and 18 h in duration. The results indicate that in ectothermic vertebrates the prevailing thermoperiod as well as the photoperiod may influence melatonin rhythms and hence the timing of annual physiological cycles.

journal_name

Neurosci Lett

journal_title

Neuroscience letters

authors

Firth BT,Kennaway DJ,Belan I

doi

10.1016/0304-3940(91)90669-k

subject

Has Abstract

pub_date

1991-01-02 00:00:00

pages

139-42

issue

1-2

eissn

0304-3940

issn

1872-7972

pii

0304-3940(91)90669-K

journal_volume

121

pub_type

杂志文章

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