No model can include all observed
processes.
This is especially true of ecological
models.
In plankton
models the line is usually drawn at
This requires a closure term parameterising all
of the effects of the higher predators.
Models are often very sensitive to the
functional
form used for the closure.
(Steele and Henderson, 1992;
Fasham, 1993; Andrews and Yool, 2000)