Abstract
1. 1. In order to establish hormonal regulation of the circadian locomotor rhythm of Talitrus saltator, the influence of Carcinus eyestalk extract, the site of the crustacean neural depressing hormone (NDH), on the activity pattern of Talitrus was examined. 2. 2. A reduction in the absolute activity level of Talitrus was consistently observed for at least one circadian cycle after injection of treated eyestalk tissue extract. 3. 3. A linear dose-response relationship exists between the concentrations of NDH-containing fractions injected, monitored as total protein content, and the reduction in locomotor activity elicited. 4. 4. The cross-sensitivity to Carcinus NDH apparent in Talitrus suggests that the same/similar hormonal agents are utilized to modulate the overt locomotor activity rhythms of both species.
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