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.