Figure 6 shows three circles representing clean waters, organically polluted water and water suffering eutrophication. The proportions of producers, consumers and decomposers in each are shown by means of slices (as in a pie) as follows (approximately):
| Clean waters | Organically polluted waters | Waters showing eutrophication | |
| Producers | 80 | 15 | 87 |
| Consumers | 13 | 5 | 4 |
| Decomposers | 7 | 80 | 9 |