Towards a mechanistic understanding of variation in aquatic food chain length revealed by meta-analysis

1. The zip file "Simulation code.zip" includes "equation.M", "Simulation_code.M" and "food web.mat", which mainly explore the interactive effects of ecosystem size and resource productivity on food chain length. In particular, the file "food web.mat" is the matrix of a food web. Please use Matlab 2020b version to run the "Simulation_code.M". 2. The zip file "Statistical code.zip" inlcudes a large empirical dataset ("Empirical_food_chain_data.csv") of changes in food chain length (FCL) in response to ecosystem size, resource productivity and disturbance respectively, compiled from 30 published papers (see "References.docx"). This data set includes 36 empirical cases relating to ecosystem size, 36 cases relating to resource productivity, and 16 cases relating to disturbance. The units for these variables are listed in "Variable_unit.xlsx". The "Statistical code for linear regressions.R" mainly explores the individual, additive and interactive effects of ecosystem size, resource productivity and disturbance on food chain length. Please use R 4.1.1 version to run this "Statistical code for linear regressions.R".Non