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Fig. 5. The distribution of Solidago rugosa, with size of gray circle representing relative abundance, and small black points representing absence from a sampled plot. The spatial distribution of this species was roughly represented by the third-order polynomial used in the CCA analysis (40% variation explained), as represented by the parabola in this schematic. The same species was well modeled by the underlying environment (68% of variation explained). Here the spatial structure indicates that adjacent sites with similar environmental conditions contain S. rugosa, but adjacent sites with different environmental conditions do not.

Table 2. Weighting of the three PCA axes representing light regime