PHENOTYPIC PLASTICITY AND GEOGRAPHIC VARIATION IN THERMAL TOLERANCE AND WATER LOSS OF THE TSETSE GLOSSINA PALLIDIPES (DIPTERA: GLOSSINIDAE): IMPLICATIONS FOR DISTRIBUTION MODELLING

JOHN S. TERBLANCHE Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa; Department of Entomology, Iowa State University, Ames, Iowa

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C. JACO KLOK Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa; Department of Entomology, Iowa State University, Ames, Iowa

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ELLIOT S. KRAFSUR Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa; Department of Entomology, Iowa State University, Ames, Iowa

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STEVEN L. CHOWN Centre for Invasion Biology, Department of Botany and Zoology, Stellenbosch University, Stellenbosch, South Africa; Department of Entomology, Iowa State University, Ames, Iowa

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Using the tsetse, Glossina pallidipes, we show that physiologic plasticity (resulting from temperature acclimation) accounts for among-population variation in thermal tolerance and water loss rates. Critical thermal minimum (CTMin) was highly variable among populations, seasons, and acclimation treatments, and the full range of variation was 9.3°C (maximum value = 3.1 × minimum). Water loss rate showed similar variation (max = 3.7 × min). In contrast, critical thermal maxima (CTMax) varied least among populations, seasons, and acclimation treatments, and the full range of variation was only approximately 1°C. Most of the variation among the four field populations could be accounted for by phenotypic plasticity, which in the case of CTMin, develops within 5 days of temperature exposure and is lost rapidly on return to the original conditions. Limited variation in CTMax supports bioclimatic models that suggest tsetse are likely to show range contraction with warming from climate change.

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