FIGURE 4.

Nonmetric multidimensional scaling (NMDS) ordination plot of macrobenthic communities in the southern basin of Lake Biwa. (a) Open circles with black letters indicate community samples in the submerged macrophyte (SM) zone, and those with gray letters indicate those in the benthic cyanobacterial (BC) zone. Ellipses indicate confidence areas (95%) for two groups of communities. Crosses with the species code (Table 1) indicate species. (b) Ordination plot with environmental variables. Only significant variables (chlorophyll a and conductivity) at p < 0.05 are plotted. Stars indicate community samples.