nearly significantP = 0.07
This agrees with some previous reports on invasive plants (Corbin and D'Antonio, 2011 ; Dassonville et al., 2011 ), but not others (Hawkes et al., 2005 ; Parker and Schimel, 2010 ), and the trend was only nearly significant ( P = 0.07; Figure 1 , Table S3 in Supplementary Material).