Darwin's naturalization hypothesis does not explain the spread of nonnative weed species naturalized in México.

1 ), while for trees and shrubs, the regression model ( N = − 1.626 + 1.3352∗ Rt ) was marginally significant ( R 2 = 0.3327, P = 0.001634); Rt explains 33.2% of the variation, but this relationship was only marginally significant .

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