The cane toad (Bufo marinus), a large, toxic toad introduced to Australia in 1935, has been rapidly spreading across the continent at over 50 km/year. Are the fastest-moving toads at the leading edge of the expanding range  morphologically different from other toads that move less rapidly? Phillips et al. (2006) compared the leg lengths of individually marked toads with the distances that they moved in a three-day period. In the following pair of graphs, the relative length of the leg is compared to the movement distance (each measurement is displayed as a deviation from the mean). One of the following two graphs is the original data, and the other shows the first permuted data set. Which is more likely to be the permuted data set? Explain your reasoning.

Transcribed Image Text:

Relative distance moved Relative distance moved 1500- 1000- 500 500- -1000- 1500 1000- 500 о -0 500- -1000- • -0.15 -0.10 -0.05 0 0.05 Relative leg length 0.10