Appendix D. Spatial autocorrelation functions for amphibian densities and local and landscape covariates.
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| FIG. D1. Spatial autocorrelation functions for amphibian densities and local and landscape covariates. Pairs of ponds are grouped into 20 categories ranked according to the distance between them, with 170 pairs in each catgory. Values outside the shaded region are significantly different from zero (P < 0.05, Bonferroni-corrected for multiple comparisons across 20 distance categories, but not corrected for the nine response variables). For the four covariates in panel C, positive correlations were high when ponds were within a few hundred meters of one another but declined within 1–2 km. |