Author Contributions
M.Y.L, S.B.H and X.D designed these experiments; M.Y.L and X.D performed the experiments and collected the data in Chongqing, China; M.Y.L, Y.J.Z and M.Q.G executed the data analyses and finalized the figures; M.Y.L and S.B.H interpreted the results, drafted and edited the manuscript. All authors contributed towards editing and finalizing the manuscript.