Abstract

Behavior patterns of forward motion and turns of male and female midges, Anarete pritchardi Kim in swarms of different sizes was analyzed. The mean speed of a pass, the path between turns, is higher in males than in females. The speed of males was not influenced by size of swarm, but that of females was reduced in swarms of larger size. Turns were of varied sharpness. Turns of 90–120° and 150–180° were more frequent than those of 60–90° and 120–150°. This bimodal distribution was shown in both sexes and various swarm sizes, and was independent of the orientation of midges in relation to the sun, the location of midges over the marker, and the position of midges in the swarm.

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