Recall the general form for a single species discrete-time model is Nt+1 = f(Nt) = N₂F(N₂) In the last lecture we met linear population models with exponential growth (or decay), where the net per capita growth rate was density-independent: F(N) = X. A nonlinear population model has a density-dependent net per capita growth rate. Q: Why might F(N) be density-dependent?

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