Spatial structure of <i>Picea chihuahuana</i> M. in the 50 x 50 m plots in the 12 study locations, based on the neighbourhood-based Clark-Evans index (<i>CE</i>), Uniform Angle index (W¯), and Mean Directional index (R¯) (<i>P</i> values estimated with 10,000 permutations) and univariate <i>L</i>-function

<p>Note: Significant results after Bonferroni correction are shown in bold type. <math><mrow><mi>W</mi></mrow><mo>¯</mo></math> and <math><mrow><mi>R</mi></mrow><mo>¯</mo></math> failed in some plots because of an insufficient number of trees (repetitions) for the calculations.</p><p>. The 99% simulation envelope (dashed red lines) for the CSR hypothesis was calculated by the Monte Carlo Method (Besag 1977), with 1,000 simulations (distance interval equals 0–12 m). <i>N</i> equals the number of <i>Picea chihuahuana</i> M. trees in the plot. 1) La Tinaja (<i>TN</i>), 2) El Ranchito (<i>RC</i>), 3) El Cuervo (<i>CV</i>), 4) Talayote (<i>TY</i>), 5) Las Trojas (<i>TR</i>), 6) El Venado (<i>VN</i>), 7) La Quebrada (<i>LQ</i>), 8) Paraje Piedra Rayada (<i>PPR</i>), 9) Quebrada de los Durán (Arroyo del Indio Ignacio) (<i>QD</i>), 10) Cebollitas (<i>CB</i>), 11) San José de las Causas (<i>SJ</i>), and 12) La Pista (Arroyo de La Pista) (<i>LP</i>).