Consider the second version of the Lotka-Volterra model: dF F(a - 6F - cS) dt ds...
• (Problem 2) Consider the second version of the Lotka-Volterra model: F(a – bF – cS) dF dt ds dt S(-k + \F). (1) Explain the model; i.e. what are the terms in the equation signify? How is this model different from equations (1)? (2) Find the equilibrium point(s). (3) Linearize (2) about the equilibrium point(s). (4) Classify if the equilibrium points are stable or unstable. (5) Pick some values for a, b, c, k, 1. Plot the solutions of...
(Problem 1) Given the Lotka-Voltera model: -) dF F(a-cs) dt ds S(-k + XF). dt (1) Linearize the model about the equilibrium point (F, S) = (0,0) using Taylor series.
Do part (1) and (3) • (Problem 1) Given the Lotka-Voltera model: = F(a-cs) dF dt ds dt = S(-k + \F). (1) Linearize the model about the equilibrium point (F, S) = (0,0) using Taylor series. Hint: see lecture notes. (2) Use the matlab code, lotkavolterra2.m to plot the solutions and the phase portrait. Choose some values for a, b, c, k, 1. (3) From the previous problem, increase the value of k. What does increasing the value of...
= • (Problem 4) Consider the following alternate predator-prey (Leslie) model: dF F(a – bF – cS) dt dS S S(-k +13). dt F Note that the prey model is the same as in the Lotka-Volterra model. However, the predators change in a different manner. Show that if there are many predators for each prey, then the predators cannot cope with the excessive competition for their prey and die off. On the other hand if there are many prey for...
1. Consider the Lotka-Volterra model for the interaction between a predator population (wolves W(t)) and a prey population (moose M(t)), À = aM - bmw W = -cW+dMW with the four constants all positive. (a) Explain the meaning of the terms. (b) Non-dimensionalize the equations in the form dx/dt = *(1 - y) and dy/dt = xy(x - 1). (c) Find the fixed points, linearize, classify their stability and draw a phase diagram for various initial conditions (again, using a...
Exercise 3, Section 9.5. Modified Lotka- Volterra Predator-Prey model Consider two species (rabbits and foxes) such that the population R (rabbits) and F (foxrs) obey the system of equations dR dt dF dt R2-R)-12RF . What happens to the population of rabbits if the number of foxes is arro? (Use the phase line analysis from Chapter 2) What happens to the population of foxes if the number of rabbits is zero? 3. Using the method of nullclines, draw an approximate...
(Problem 3) Consider the following three-species ecosystems: dF F(a – cS) dt ds S(-k + \F – mG) dt dG G(-e+oS). dt Assume that the coefficients are positive constants. Describe the role each species plays in this ecological system. =
Problem 3. Consider the following continuous differential equation dx dt = αx − 2xy dy dt = 3xy − y 3a (5 pts): Find the steady states of the system. 3b (15 pts): Linearize the model about each of the fixed points and determine the type of stability. 3b (15 pts): Draw the phase portrait for this system, including nullclines, flow trajectories, and all fixed points. Problem 2 (25 pts): Two-dimensional linear ODEs For the following linear systems, identify the...
Consider the economic model below, where P is the price of a single item on the market and Q is the quantity of the item available on the market. Both P and Q are functions of time that can be viewed as two interacting species, and a, b, c, and f are positive constants. dQ dP cQ(fP Q) dt aP dt If a 1, b 15,000, c 1, and f= 10, find the equilibrium points of this system and classify...
Question 1: (5 marks) Consider a two-species model for populations Ni and N2 follows as N1 (a -bN1 cN2) dt N2 (d - eN2 - Ni) dt (a) What kind of interaction does this system of equations represent? (b) Show that the equations can be simplified to dn1 an n1 (1 d7 dn2 Bn2 (1n2-n1). dT mT into the system of equations and picking by substituting N = kn\, N2 = ln2 and t appropriate constants k, l and m...