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The niches of S. alterniflora in China and America under climatic ecological space. (A) Represents the contribution of each variable to the principal component axis, (B, C) represent the histograms representing the niche equivalence (D) test and niche similarity test of the two regions. (D) Indicates the overlapping of the species origin and invasion countries. Blue indicates niche overlap, green represents unfilling, and red represents expansion.
