THE RESPONSE TO ROTATING OBJECTS BY ANOTOGASTER SIEBOLDII(SELYS) MALES, Pt 2 (ANISOPTERA: CORDULEGASTRIDAE)

摘要

It has been repotted that the response to rotating objects by A. sieboldii male male indicates recognition of the objects as male male. The influences of colour, size and rotation velocity (RV) of discs on hovering ratio (HVR) were studied with experiments using a small electric rotating device. Among the rotating discs with white, yellow, orange, red, green, or blue alternating with black, the one with green elicited the highest HVR (98%), whereas the HVR to the yellow/black disc was lowest (32%). This suggests that yellow has a role as a warning coloration against predators rather than being involved in intraspecific recognition. - In the relationship of the HVR to RV of the green/black disc, the HVR reached a peak around 20-25 Hz In relation of HVR to the size of the disc, the larger the diameter of the disc, the higher was the HVR, and when different sizes of discs were put side by side, A sieboldii male male had a tendency to respond to the larger disc of the pair.