Representation of the workflow.

In an interaction network singular green and red arrows represent a commensalistic interaction and an amensalistic interaction respectively, whereas double green arrows represent mutualism and double red arrows competition. A green and red arrow signifies an exploitative interaction. See S1 Fig for more details. (A) A random interaction matrix A. This interaction matrix is implemented in the gLV model (B) together with the intrinsic growth rates and carrying capacities of the species. (C) All timeseries are (slightly) different due to the variation in the interaction strengths. (D) The partial correlations are calculated from the abundances per species sampled from the 300 different hosts at equilibrium. Only the significant correlations and the lower part of the matrix are used for the comparison with the original interaction matrix A. Variations to the workflow were studied by adding for example a perturbation or process noise.