Number of neighbours and neighbouring species.

<p>(a) Mean number of neighbours and (b) neighbouring species around an “average” bacterium as a function of distance from the bacterium and as a function of bacterial density. The mean number of neighbours and neighbouring species are derived from Ripley's K(r) function of LGCP with parameters μ = −10.26, σ² = 2.90, β = 20 for the 10⁸ cells g⁻¹ soil density, μ = −7.52, σ² = 1.90, β = 25 for the 10⁹ cells g⁻¹ soil density and μ = −4.91, σ² = 1.29, β = 25 for the 10¹⁰ cells g⁻¹ soil density. Grey envelopes surrounding curves represent the maximum and minimum of these numbers calculated from 39 simulations. Note the logarithmic scale on the y axis.