Fig. 6. The effect of traffic noise on the frequency of frog calls. (A) Dominant frequency of the advertisement call of Litoria ewingii, with wet bulb temperature held constant at 10ºC (n = 24). (B) Lower frequency of the advertisement call of Crinia signifera, with water temperature held constant at 15ºC (n = 28). Solid lines show the predicted relationships, dashed lines the 95% credible intervals, and circles the mean call frequency observed at each site, corrected for temperature.