Ecology 6th Edition by Charles Krebs

Exercise 1

A shift in the shallow lake community from the dominance of rooted aquatic plants to the dominance of phytoplankton is partly driven by nutrient additions to the lake water but this is not the complete story (Moss 2007). What are the switches that are included in Figure 20.23 and how do they relate to the scheme illustrated in Figure 20.1?
Reference Figure: 20.1