Similar metabolic rate-temperature relationships after acclimation at constant and fluctuating temperatures in caterpillars of a sub-Antarctic moth |
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| Institution: | 1. School of Biological Sciences, Monash University, Victoria 3800, Australia;2. Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;3. Department of Biology, The University of Western Ontario, London, Ontario N6A 5B7, Canada;1. Department of Zoology, Faculty of Life Sciences, Tel Aviv University, 6997801, Israel;2. Sagol School of Neuroscience, Tel Aviv University, 6997801, Israel;1. Biology Department, Emory University, O. Wayne Rollins Research Center, 1510 Clifton Road NE, Atlanta, GA 30322, USA;2. School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK;3. Department of Biology, Washington University in St. Louis, One Brookings Drive, Campus Box 1137, St. Louis, MO 63130, USA;1. Department of Entomology, Texas A&M University, College Station, TX 77843, United States;2. Beltsville Agricultural Research Center, Bee Research Laboratory, Beltsville, MD 20705, United States;1. Jiangsu Key Laboratory for Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, Jiangsu, China;2. Hangzhou Key Laboratory for Animal Adaptation and Evolution, School of Life Sciences, Hangzhou Normal University, Hangzhou 310036, Zhejiang, China |
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| Abstract: | Temperature compensation in whole-animal metabolic rate is one of the responses thought, controversially, to characterize insects from low temperature environments. Temperature compensation may either involve a change in absolute values of metabolic rates or a change in the slope of the metabolic rate – temperature relationship. Moreover, assessments of compensation may be complicated by animal responses to fluctuating temperatures. Here we examined whole animal metabolic rates, at 0 °C, 5 °C, 10 °C and 15 °C, in caterpillars of the sub-Antarctic moth, Pringleophaga marioni Viette (Tineidae), following one week acclimations to 5 °C, 10 °C and 15 °C, and fluctuating temperatures of 0–10 °C, 5–15 °C, and 10–20 °C. Over the short term, temperature compensation was found following acclimation to 5 °C, but the effect size was small (3–14%). By comparison with caterpillars of 13 other lepidopteran species, no effect of temperature compensation was present, with the relationship between metabolic rate and temperature having a Q10 of 2 among species, and no effect of latitude on temperature-corrected metabolic rate. Fluctuating temperature acclimations for the most part had little effect compared with constant temperatures of the same mean value. Nonetheless, fluctuating temperatures of 5–15 °C resulted in lower metabolic rates at all test temperatures compared with constant 10 °C acclimation, in keeping with expectations from the literature. Absence of significant responses, or those of large effect, in metabolic rates in response to acclimation, may be a consequence of the unpredictable temperature variation over the short-term on sub-Antarctic Marion Island, to which P. marioni is endemic. |
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| Keywords: | Fluctuating temperatures Lepidoptera Metabolic rate Polar environments Temperature compensation |
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