Pearson correlation coefficients between all predictor variables within the same grid size.

The predictors are shallow water area (SW), coastline length (CL), habitat diversity based on area (HDIa), habitat diversity based on number of patches (HDIn), sea surface temperature (SST), and net primary productivity (NPP). Asterisks indicate significance value of P: *(<0.05), **(<0.01); ***(<0.001); ns (not significant). Grid sizes are as follows: Small = 23,000 km2; Medium = 92,000 km2; Large = 368,000 km2; UTM = 617,000 km2; Extra large = 1,470,000 km2; Largest = 5,100,000 km2.