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Fig. S1. Time to reach different degradation levels under both kinds of spatial heterogeneities in combination (heterogeneous bacterial dispersal conditions and heterogeneous initial substrate concentrations), without and with different transportation networks (cf. column titles). Favourable and unfavourable bacterial dispersal conditions covered 50% of the simulation area respectively, at an intermediate degree of spatial clumping (e.g. Fig. 1E). One hundred simulation runs were performed for each scenario. Subplots show the simulated time until bacteria have consumed 25%, 50%, 75% and 99% of the substrate (different line types, cf. legend), plotted versus spatial configuration of networks (networks 1–3, cf. Fig. 1B–D) when networks were present. Subplots comprise medians, boxes covering the interquartile range of values (between 25th and 75th percentile), whiskers extending to values not more than 1.5-fold out of this range and outliers (plusses).

A–D. Fifty per cent of the area initially contained substrate, lowest degree of clumping (e.g. Fig. 1F).

E–H. Fifty per cent of the area initially contained substrate, highest degree of clumping (e.g. Fig. 1G).

I–L. Twenty per cent of the area initially contained substrate, highest degree of clumping (e.g. Fig. 1H). Note the logarithmic scale and much larger range of the time axis (compared with subplots; A–H).

Appendix S1. Combinations of heterogeneous bacterial dispersal conditions and heterogeneous initial substrate distributions.

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