Fig. 6. Latency (main panels A—C) and phase (insets in A—C) of the
onset of tegula activity in the wingbeat cycle and their relationship to wing
stroke parameters (see Fig. 2)
in the fore- (i) and hindwing (ii) (data from four individuals shown, each in
a different colour). (A) In both pairs of sense organs, latency depends on the
downstroke interval (P<0.05; solid regression lines). However, the
phase of tegula activation was not related to cycle period
(P<0.05; broken regression lines). (B) Neither the latency nor the
phase of the tegula discharge depends on stroke amplitude
(P>0.05). (C) The relationship between the latency of tegula
activity and wing angular velocity is non-linear (r2
significantly different from zero, P<0.01). Within the range of
angular velocities observed, latency approaches or reaches a minimum value at
higher angular velocities. In contrast, the phase of tegula discharge is
almost independent of angular velocity. For details, see text. Relationships
for all animals investigated are given in
Table 1.
