Conduct sensitivity analyses for the impact of the number of predators and the
regulation strength on algal bloom. You should find that by increasing the number
of predators which are introduced into a system, the peak of algal blooms (which
occur without these predators) is reduced and the number of algal blooms is also
reduced. Regulation strength is effective in controlling algal biomass and gizzard
shad numbers as well. By reducing the regulation strength, the amount of algae in
the system is substantially enhanced, and increasing the amount of regulation
strength diminishes the amount of algae in the system.
In a separate set of sensitivity analyses, assess the impacts of egg survival rates
and winterkill on the system’s dynamics. In the case of winterkill, reduction of the
Fig. 37.9
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37 Recruitment and Trophic Dynamics of Gizzard Shad