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. 2007 Nov 21;2(11):e1208. doi: 10.1371/journal.pone.0001208

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Lin et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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The two bars (red bar for the number of invasive species, blue bar for average GDP from 1985 to 2004) are standardized with same height in Guangdong province which has the highest average GDP (76.7 billion USD) and the highest abundance of invasive species (117 species).