Supplement 1. MATLAB code used in the calculation of asymmetry values.

File List Asymmetry.m -- main script <br> corr.m -- supplementary script<br> intimp.m -- supplementary script <br> quant2bin.m -- supplementary script<br> sortmat.m -- supplementary script Description This Supplement contains a Matlab script used to calculate asymmetry values. Asymmetry.m needs four supplementary scripts ( corr.m, intimp.m, quant2bin.m, sortmat.m). Asymmetry.m generates the following outputs: total degree each row (1st column); frequency of interactions each row (2nd column); sum dependences each row (3rd column); asymmetry value for each row (4th column). Finally, it gives the correlation values between abundance and asymmetry.