Thermal dependency of locomotion
From the thermal performance curves based on racetrack sprint speeds for Kozu and Hachijo-Kojima (Fig. 3A) we found Kozu lizards (n = 81) to have maximum sprint speeds at warmer temperatures than Hachijo-Kojima lizards (n = 85), with a difference inTopt of 1.4°C (Table S4). From the thermal performance curves based on open field speeds, we found Kozu lizard sprint speeds (n = 79) to surpass snake crawling speeds (n= 61; 34 from Kozu and 27 from Niijima) at temperatures of 33.8 °C and over (Fig. 3B). Accordingly, the mean foraging body temperature of Kozu lizards is approximately 1.6 °C above this threshold at which Kozu lizards outpace snakes, and about 1.6°C below it for Hachijo-Kojima lizards. Due to the nature of the distribution of the data on Kozu lizard open field sprint speeds, however, none of the models yielded the typical unimodal shaped curve, and we could therefore not extract thermal performance parameter estimates for this particular group.