Fig. 2. (A) Effects of body temperature on field running speed for males (N=86, open triangles) and females (N=84, circles; gravid individuals are indicated by dotted circles). Adult running speed was related to beetle T_b in nature for females (broken line: y=–0.29+0.068x; R²=0.31; F_1,82=37.1; P<0.0001) and males (solid line: y=–0.22+0.072x; R²=0.28; F_1,84=32.3; P<0.0001). (B) Field running speed of males and females mating or not mating in nature. Data are least square means (±s.e.m.) of running speed of N=42 individuals for all treatments but field-mating males (N=44). The sex difference and mating status effect were significant (see Results).