Abstract
Hormonal bases of chromatic and behavioural changes in female Holbrookia propinqua were studied. Bright orange and yellow pigmentation were induced by progesterone or testosterone. Oestrogen treatment induced significant deposition only of the orange pigment, which did not attain full brightness. Progesterone and testosterone induced agonistic behaviour by females towards males; oestrogen did not. However, frequency of aggression was lower for females treated simultaneously with oestrogen and progesterone. Induction of bright reproductive coloration and activation of agonistic responses towards males by the same hormones suggests a close correlation between the signal value of the colour pattern and female aggression towards males.
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