The simple models of stochasticity described in the book leave out a lot of biological detail. Use your imagination to add some of that detail back.
1. Think of two biological factors that are neglected in the stochastic model bt = rtbt, Equation 6.1.1.
2. Think of three factors neglected in the stochastic model of immigration (Example 6.1.5).
3. Think of two factors neglected in the Markov chain model of presence and absence on a island (Figure 6.1.8).
4. Write a simple description of a population with stochastic production and stochastic immigration.