Behavioral Temperature Regulation in the Pill Bug, Armadillidium Vulg?re (isopoda) By

Autonomie temperature regulation in crustaceans has been the subject of various studies. These included measurements of body temperature (e.g., Edney, 1951a, 1953; Warburg, 1965), lethal limits of ambient temperature (e.g., Edney, 1964; Orr, 1955), water loss by evaporation (e.g., Edney, 1951b; Warburg, 1965), and respiratory metabolism (e.g., Demeusy, 1957; Edwards & Irving, 1943). Behavioral thermor?gulation, on the other hand, has attracted the endeavors of few zoologists. Aquatic crustaceans have received some atten tion (e.g., Casterlin & Reynolds, 1977; Crawshaw, 1974; Fast & Momot, 1973) but, with the exception perhaps of only two studies on thermotaxis (Barlow & Kuenen, 1957; Warburg, 1964), terrestrial crustaceans have been left aside. The present series of experiments on a terrestrial isopod has the purpose of filling this blank. Studies were made of thermal pre fe renda, acclimation, costs of thermor?gulation, huddling, circadian rhythm, burrowing, dormancy, and