Body Temperature Regulation and Terrestrial Activity in the Ectothermic Beetle Cicindela tranquebarica

In the field, tiger beetles basked and maintained body temperature (Tb) between 33 and 38 C while searching for prey and mates. Time spent searching and searching speed were positively correlated with Tb and, to a lesser extent, with surface temperature. In the laboratory, running speed was positively correlated with Tb. The minimum Tb for flight ranged from 22 to 26 C. At high ambient temperatures Tb was modulated by stilting and short flights which promoted convective cooling. High body temperature increases the distance that a tiger beetle can search and may enhance encounter rates with prey and mates.