Supplement 1. Fortran code simulating a neutral community with demographic noise, used to generate Fig. 5.

File List Neutral_fortran.txt (MD5: 7d5175db22c1bf3d1724b608611568de) Description Neutral_Fortran is a program that simulates neutral dynamics (the selection strength is alpha, so alpha = 0 is neutral) for a panmictic population of n individuals. The initial conditions are 50 species, mutation rate is dmu. The output is the file st1.dat, which is a list of abundance of species (of families) - the list is not sorted so if st1.dat contains the numbers 13,25,11 it implies that one species has abundance 13, another has 25, another has 11 and so on.