The halteres of the blowfly Calliphora
Tóm tắt
We quantitatively analysed compensatory head reactions of flies to imposed body rotations in yaw, pitch and roll and characterized the haltere as a sense organ for maintaining equilibrium. During constant velocity rotation, the head first moves to compensate retinal slip and then attains a plateau excursion (Fig. 3). Below 500°/s, initial head velocity as well as final excursion depend linearily on stimulus velocities for all three axes. Head saccades occur rarely and are synchronous to wing beat saccades (Fig. 5). They are interpreted as spontaneous actions superposed to the compensatory reaction and are thus not resetting movements like the fast phase of ‘vestibulo-ocular’ nystagmus in vertebrates. In addition to subjecting the flies to actual body rotations we developed a method to mimick rotational stimuli by subjecting the body of a flying fly to vibrations (1 to 200 μm, 130 to 150 Hz), which were coupled on line to the fly's haltere beat. The reactions to simulated Coriolis forces, mimicking a rotation with constant velocity, are qualitatively and to a large extent also quantitatively identical to the reactions to real rotations (Figs. 3, 7–9). Responses to roll- and pitch stimuli are co-axial. During yaw stimulation (halteres and visual) the head performs both a yaw and a roll reaction (Fig. 3e,f), thus reacting not co-axial. This is not due to mechanical constraints of the neck articulation, but rather it is interpreted as an ‘advance compensation’ of a banked body position during free flight yaw turns (Fig. 10).
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