Potential local adaptation in populations of invasive reed canary grass (<i>Phalaris arundinacea</i>) across an urbanization gradient.

Although the interaction between specific root length plasticity and source population was only marginally significant ( p = .061), the model with the interaction term clearly fit our data better than a no‐interaction model, based on both AIC (ΔAIC = 7.3) and a likelihood ratio test ( p = .004).

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