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Fig. 5. Effects of temperature on water permeability for prepupae of Diplolepis spinosa collected at Medicine Hat, Alberta, Canada. The transition temperature for this species was 33.5 °C. The equation for the regression line below the transition temperature is y=0.028x+0.18 (r2=0.99), where y is cuticular permeability (µg h-1 cm-2 mmHg-1) and x is temperature (°C), and the equation for the regression line above the transition temperature is y=0.426x-13.08 (r2=0.91). Values are means ± S.E.M. (N=5-8).





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