Fig. 2. Canonical correspondence ordination diagram of 33 bird species to examine the strength of association between local- and landscape-level habitat variables in an urban biodiversity study. Points correspond to species scores relative to the axes that are linear combinations of the environmental variables (arrows). Asterisks indicate species that were recorded on less than 5% of the sites. These species (n = 8) were made supplementary, meaning that they had no influence on the analysis and were added post hoc to the ordination. Eigenvalues (Axis I = 0.35, Axis II = 0.10) for each axis provide an indication of the relative importance of that axis in explaining variation in the data (CCA I, 39.2%; and CCA II, 10.5% of the variance explained). Only those habitat variables that were highly correlated with the axes are shown (i.e., those with correlations coefficients >0.30; Table 1). Refer to Tables 1 and 2 for definitions of species and habitat variable codes.