Abstract
Adrenaline and noradrenaline concentrations in plasma of toads were measured by use of a fluorimetric method. Seasonal variations in the plasma concentration of these catecholamines were verified. Adrenaline decreased markedly during the mating season. Towards the end of summer a progressive increase took place, reaching high values during autumn and winter. Maximal concentrations were found to coincide with the premating period. Noradrenaline decreased during autumn. No changes were observed in the other seasons. The possible correlation of these results with the seasonal variation of adrenal catecholamines in the toad is discussed. The mean annual concentration of adrenaline in plasma was 0.59 ≠ 0.04 μg per 100 ml, and that of noradrenaline was 0.67 ≠ 0.05 μg per 100 ml.
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