Abstract
THE role of pigment migration in light–dark adaptation of the eyes of nocturnal moths has long interested investigators1,2. Efforts have been made to find out what part pigment migration plays in the behavioural changes associated with light–dark adaptation3, and in the phenomenon called ‘glow’4. Recently, it has been reported that adaptation in nocturnal moths occurs in two stages, the first of which is not accompanied by pigment migration5. The discovery that variations can occur in the light-threshold of a dark-adapted compound eye with practically no change in the glow area6 is further evidence of the independence of adaptation and pigment position.
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