Figure 1.

Thermal tolerance responses (CT_max, CT_min and tolerance breadth) of urban and rural acorn ant workers to rearing temperature. Responses from three cities are shown in separate panels. Lines represent predicted values ±1 s.e. from linear mixed effects models (performed separately for each city). See table 1 for model coefficients. Points indicate colony mean thermal tolerance, and are jittered within each combination of source population and temperature treatment.