species (gizzard shad occur in both the limnetic and littoral zone, and largemouth
bass occur primarily in the littoral zone).
The population dynamics of the predator are given in the module of Fig. 37.8.
Here, the death of small predators depends on the availability of gizzard shad larvae
and early juveniles (Fig. 37.9).
Similarly, the effects of biomass of prey for small and adult predators are
specified through control variables set up as graphs, shown in Figs. 37.10 and 37.11.
The modules capturing algal and zooplankton growth are set up as shown in
Figs. 37.12 and 37.13.
The growth rates for algae and zooplankton are specified, respectively, as in
Figs. 37.14 and 37.15.
Consumption rates of algae by zooplankton and of zooplankton by gizzard shad
are also specified graphically (Figs. 37.16 and 37.17).
Now all the pieces of the model are in place and we are ready to investigate the
impacts of biomanipulation. Our models show that the top-down manipulations are
effective in controlling populations of gizzard shad (Figs. 37.18, 37.19, and 37.20).
Fig. 37.8
37.1 Gizzard Shad Model
333
bass occur primarily in the littoral zone).
The population dynamics of the predator are given in the module of Fig. 37.8.
Here, the death of small predators depends on the availability of gizzard shad larvae
and early juveniles (Fig. 37.9).
Similarly, the effects of biomass of prey for small and adult predators are
specified through control variables set up as graphs, shown in Figs. 37.10 and 37.11.
The modules capturing algal and zooplankton growth are set up as shown in
Figs. 37.12 and 37.13.
The growth rates for algae and zooplankton are specified, respectively, as in
Figs. 37.14 and 37.15.
Consumption rates of algae by zooplankton and of zooplankton by gizzard shad
are also specified graphically (Figs. 37.16 and 37.17).
Now all the pieces of the model are in place and we are ready to investigate the
impacts of biomanipulation. Our models show that the top-down manipulations are
effective in controlling populations of gizzard shad (Figs. 37.18, 37.19, and 37.20).
Fig. 37.8
37.1 Gizzard Shad Model
333