Figure 8. The least-square mean (lsmean) based effects of the environmental parameters in the least AIC GLM for δ13CPOM. Effect of (a) classes, (b) sampling depth, (c) latitude, (d) temperature, (e) salinity, (f) log-transformed chlorophyll-a concentration, and (g) log-transformed nitrate concentration. Closed circles with bars or solid lines with shadows represent the lsmeans with 95 % confidence intervals. The small gray dots represent the observation data. When necessary, the settings of the class and layer for calculation of lsmeans were class II and surface, respectively.