Abstract
The locomotor activity of flies observed as isolated individuals in an “open field” observation chamber contains two components—the amount and speed of movement. These are distinct behavioural phenotypes. The reactivity of flies to handling disturbance is reflected chiefly by changes in the speed rather than in the amount of locomotion, but there are significant differences in the overall pattern of expression of reactivity between males and females. The amount and speed of locomotion are under independent genetic control, but genes affecting movement in the “open field” may also have effects on the locomotor activity of virgin females when they are courted. Variation in the locomotor activity of females has little effect on the amount of wing vibration which males direct at them, but significantly affects the amount of contact stimulation by licking which they receive.
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