Figure 9. Least-square mean (lsmean) values based on the effects of the environmental parameters in the least-AIC GLM for δ15NPOM. Effect of (a) classes, (b) sampling seasons, (c) sampling depth, (d) latitude, (e) longitude, (f) temperature, and (g) salinity. 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, season and layer for calculation of lsmeans were class II, summer, and surface, respectively.