Mathematical models in biology: an introduction by Elizabeth S. Allman, John A. Rhodes

By Elizabeth S. Allman, John A. Rhodes

Concentrating on discrete types throughout quite a few organic subdisciplines, this introductory textbook comprises linear and non-linear versions of populations, Markov versions of molecular evolution, phylogenetic tree development from DNA series info, genetics, and infectious sickness versions. Assuming no wisdom of calculus, the improvement of mathematical subject matters, resembling matrix algebra and easy likelihood, is inspired by means of the organic types. machine examine with MATLAB is included all through in workouts and extra vast initiatives to supply readers with genuine event with the mathematical versions.

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Negative? c. Give expressions for the relative growth rates for the geometric and logistic population models, as well as the models of this section. d. Graph each of the relative growth rates you found in part (c) as functions of Pt . You may have to pick a few values of the parameters to draw the graphs. 2. 2 show Pt+1 = F(Pt ) < Pt when Pt is small. Explain the affect of this feature on population dynamics. Why might this be a biologically important feature? 3. Construct a simple model showing an Allee effect as follows.

Since this looks like an exponential decay curve moved down 1 unit, that leads us to a formula such as: P = ae−b P − 1 P for some positive values of a and b. 4. 11. Per-capita growth rate for the logistic model. model, we make some variable substitutions. Letting b = terms of the new parameters r and K , the model becomes r K and a = er , in P = er e−r P/K − 1 = er (1−P/K ) − 1. P Now straightforward algebra leads to the Ricker formula Pt+1 = Pt er (1−Pt /K ) . In this formula, K should still be interpreted as the carrying capacity, because if P > K , then P < 0; and if P < K , then P > 0.

A remark on calculus: If you know calculus, the linearization process might remind you of approximating the graph of a function by its tangent line. 3. Analyzing Nonlinear Models be expressed as the ratio 23 pt+1 for small values of pt . But pt pt+1 Pt+1 − P ∗ F(Pt ) − P ∗ F(Pt ) − F(P ∗ ) = = = , pt Pt − P ∗ Pt − P ∗ Pt − P ∗ where Pt+1 = F(Pt ) is the equation defining the model. ) Because we are interested only in values of Pt very close to P ∗ , this last expression is very close to lim ∗ Pt →P F(Pt ) − F(P ∗ ) .

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