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      Seasonal and daily plasma corticosterone rhythms in American toads, Bufo americanus.

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      General and comparative endocrinology

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          Abstract

          Concentrations of corticosterone were measured in the plasma of American toads, Bufo americanus, on a seasonal basis using a radioimmunoassay technique. Two populations of toads, maintained under different light conditions, were monitored to observe the effects of photoperiod on the seasonal rhythm of plasma corticosterone. Under a natural photoperiod toads demonstrated a rhythm consisting of a spring peak and a fall peak in corticosterone concentration. Toads maintained under a 12L:12D photoperiod all year round demonstrated a similar rhythm with peaks in the spring and fall. This suggests that an endogenous (circannual) rhythm of corticosterone may be playing an important role in the seasonal change of overt behavior and physiology of Bufo americanus. A daily rhythm of corticosterone was also detected in toads when blood samples were taken every 4 hr. When compared to a previously published circadian rhythm study of locomotor activity, the surge in corticosterone concentration for the day occurred at 1730 just prior to the peak in locomotor activity.

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          Author and article information

          Journal
          Gen. Comp. Endocrinol.
          General and comparative endocrinology
          0016-6480
          0016-6480
          Jun 1983
          : 50
          : 3
          Article
          6884754
          259d0705-8019-438f-8313-4add214439ef

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