Fig. 2
Eigenvalue scores (Moran’s eigenvector maps, MEMs) given by the first and second axes produced by each ordination and connectivity described by the Gabriel graph. The first two axes of each of the ordination analyses of the spatial and environmental variables (matrices, Y, F, R) are shown with the connectivity graph superimposed over the study sites. Insets show permutation tests of sets of smoothed MEMs for the broad (1) and the fine (2) scales. Eigenvalue scores are proportional to the size of the squares (black = negative, white = positive) at each site. The ordination with highest R2 is given in each case. The significance was determined by permutating the maximum observed R2 against a null distribution of the other MEMs in the group having values with no spatial structure. The 95 % quantile of the simulated R2 distribution is indicated with crosses connected by a dotted line with significant p-values indicated on inset graphs