Ultradian Activity Rhythms of Drone-Flies (Diptera, Syrphidae) in the Southern Trans-Urals
V. S. SOROKINA
Abstract
According to the results of analysis of diurnal changes in the abundance of drone-flies, three main boundaries of the ultradian periods of flying were revealed: morning, day and evening. The transit time and solemnity of the borders differ in spring, summer and autumn. With the help of classification of the ordered objects, six common ultradian periods were revealed; quantitative characteristics of drone-fly population are reported for each of these periods. The best similarity of species composition and abundance of Syrphidae was observed early in the morning and late in the evening. Four rhythms of drone-fly activity were revealed: morning, day, evening, and morning-evening. A jumpwise character of activity during a day is characteristic of the drone-flies of Epistrophe and Mallota genus.
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