As you can imagine, ecosystem processes were very different in the lake when these two photos were taken.
As far an anybody knows, Daphnia is the only planktonic crustacean that can cause such a dramatic change in lake attributes. The data appear in:
Sarnelle, O. 1993. Herbivore effects on phytoplankton succession in a eutrophic lake. Ecological Monographs 63:129-149.
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