Abstract
Both the daily and the seasonal dispersal dynamics of the true water bug, Sigara lateralis (Leach, 1817) were studied in 2000 and 2005 under various environmental circumstances by monitoring the number of individuals attracted to highly and horizontally polarising shiny black plastic sheets laid on the ground. The diel and seasonal dispersal activity characteristics of S. lateralis are described here in detail. The seasonal patterns of mass dispersal of water insects in general were different in the two studied years, the possible reason for which could be that there was a longer period when the environmental factors temporarily influenced the number of flying insects. The diel dispersal patterns of S. lateralis were also different in 2000 and 2005. It seems that the diurnal dispersal pattern of S. lateralis described previously can change year by year. Females outnumbered males in most cases, and females with eggs were the most active during mass dispersal.
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