Table 6.

Statistical comparison of the MDS configurations obtained. Procrustes sum of squares, correlation, and p value obtained by permutation are given

	Sum of squares	Correlation	p value
Abundance versus presence–absence
All species	0.634	0.603	<0.001
Introduced species	0.656	0.586	<0.001
All species versus introduced species
Abundance	0.124	0.936	<0.001
Presence–absence	0.293	0.841	<0.001