Three-spined sticklebacks feed on both mayfly nymphs and Daphnia (water fleas) in a freshwater pond. A selective chemical treatment was applied to the pond to control the Daphnia population.
| Organism | Number | Mean biomass of each organism (g) | Biomass of population (g) |
|---|---|---|---|
| Pondweed | 80 | 120 | 9,600 |
| Mayfly nymphs | 1,200 | 0.04 | ? |
| Daphnia | 25,000 | 0.0008 | 20 |
| Sticklebacks | 40 | 1.8 | 72 |
Explain how eliminating the Daphnia would affect the population of mayfly nymphs in this pond.
