Filename: trajectories.csv id: replicate identifier variant: co-existence status ("competition" or "monoculture") day: day of experiment species: mite species ("CRM" or "WCM") n: population density Filename: model.RData The GAMM fitted in R to population trajectories data. Filename: sim.csv day: day of experiment spec_var: combination of co-existence status ("competition" or "monoculture") and species ("CRM" or "WCM") 10k population densities simulated from the fitted GAMM Filename: NFD_over_time_monte_carlo_gam.py Python script to compute niche and fitness differences. Takes sim.csv (densities over time for different instantiations) and model.RData ( stores the GAMM from R for the growth rates) as input and generates the file Data_NFD_monte_carlo_multi_c_new.csv which stores the niche and fitness differences computed for these communities.

The study was supported by National Science Centre Poland (NSC) Grant No. 2019/35/N/NZ8/02639 to Agnieszka Majer (design and execution of experiments) and Grant No. 2018/29/B/NZ8/00066 to Lechosław Kuczyński (conceptualisation and methodological development).