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. 2004 Dec 9;101(51):17725–17730. doi: 10.1073/pnas.0405176101

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Copyright © 2004, The National Academy of Sciences

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Fig. 2. — The number of exotic plant species increases as a linear function of per capita real estate GSP (a) and total real estate GSP (b). The equation for the line in a is number of exotics species per km² = 67.7 + 0.09(per capita real estate GSP per km²). The equation for the line in b is number of exotics species per km² =–587.8 + 77.2[log₁₀(real estate GSP) per km²]. All values are based on the log₁₀ of state area in km².