highly significantP = 0.006
We also verified that null distributions for the Pearson and Spearman correlation values for our main effect had means close to zero (Pearson r mean < 0.001, Spearman rho mean = 0.001) and that the correlation values observed for our main effect were highly significant compared to these null distributions (Pearson P = 0.006; Spearman P = 0.002; SI Appendix , Fig.