Abstract
1. 1. The respiratory metabolism of the Antarctic tick, Ixodes uriae White (Acari: Ixodidae) was investigated at Palmer Station, Anvers Island (64°46'S; 64°03'W) during the austral summer, January 1981. 2. 2. At 20°C the metabolic rate of females was 303 nl/mg live wt/hr, approximately three times that of males and engorged nymphs. 3. 3. Laboratory acclimation of females, males and nymphs to 0 and 10°C for 2 wk had no effect on respiration rates, suggesting that I. uriae lacks the ability for compensatory acclimation of respiration rate. 4. 4. Metabolic rates of temperate ixodids are similar to those for females of I. uriae. which suggests that metabolic cold adaptation is absent in this species.
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