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Algal blooms can have negative effects on an ecosystem by dominating its phytoplankton communities. Gonyostomum semen is a nuisance alga infesting many parts of northern Europe. Could the overall biomass of G. semen be controlled by grazing zooplankton species? A research team examined the relationship between the net growth rate of G. semen and the number of Daphnia magna grazers introduced in test tubes. Net growth rate was computed by comparing the initial and final abundance of G. semen in the experiment, with a negative value indicative of a decrease in abundance. The study also examined the grazing effect of another species, Daphnia pulex, on the abundance of the nuisance alga G. semen in the lab. The table displays the findings
| Number of D. pulex grazers | 0 | 1 | 2 | 3 | 4 | 5 | 6 |
| Net growth rate of G. semen | -0.7 | -0.4 | -0.6 | -0.3 | -0.5 | -1.0 | -0.2 |
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