Changes of body temperatures in Sympetrum frequens (Selys) reproductive pairs (Anisoptera: Libellulidae)

The reproductive behaviour was divided into four phases: perching (phase I), less than 1 min from the start of copulation (phase II), more than 3 min from the start of copulation (Phase III) and more than 1 min from the start of oviposition (phase IV). The body temperature (Tb) of the S was highest in phase III, while in the $ Tb was not significantly different among phases. The changes of Tb are different between the sexes, however, they are both influenced largely by the wind as well as by the air temperature, and particularly in the 9 the effect seems to be larger than in the S, possibly because of its smaller body size.