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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
NTI values of different species assemblages: alien, casual aliens, naturalized, NNI (naturalized but not invasive) and invasive species (a); and MNTD values between these assemblages (b), visualized by PCoA analysis.