Question

3. Below are two typical Lotka-Volterra interspecific competition models shown graphically as the isoclines of two species plotted as a function of the density of species 1 (N1) and species 2 (N2). Show with the use of arrows and vectors the joint movement of both populations for each region of the graphs (each region is defined with reference to the isoclines). Then describe, with reference to the isoclines, why the joint movement in each region is the way it is (why the arrows point the way they do). State the outcome of competition in each system (name the outcomes and also show on the graphs where the populations will eventually stabilize). Illustrate, by drawing lines from the equilibrium point to each axis, the equilibrium population sizes of N1 and N2. 4. The Lotka-Volterra models tell us what happens when competing species are able to reach equilibrium (both K's are reached). However, there are reasons why equilibrium might not be reached, so that the model does not apply. What are two of these reasons? Can you provide an example of each type?

          3. Below are two typical Lotka-Volterra interspecific competition models shown graphically as
the isoclines of two species plotted as a function of the density of species 1 (N1) and species
2 (N2). Show with the use of arrows and vectors the joint movement of both populations for
each region of the graphs (each region is defined with reference to the isoclines). Then
describe, with reference to the isoclines, why the joint movement in each region is the way
it is (why the arrows point the way they do). State the outcome of competition in each
system (name the outcomes and also show on the graphs where the populations will
eventually stabilize). Illustrate, by drawing lines from the equilibrium point to each axis, the
equilibrium population sizes of N1 and N2.

4. The Lotka-Volterra models tell us what happens when competing species are able to reach
equilibrium (both K's are reached). However, there are reasons why equilibrium might not
be reached, so that the model does not apply. What are two of these reasons? Can you
provide an example of each type?

3. Below are two typical Lotka-Volterra interspecific competition models shown graphically as
the isoclines of two species plotted as a function of the density of species 1 (N1) and species
2 (N2). Show with the use of arrows and vectors the joint movement of both populations for
each region of the graphs (each region is defined with reference to the isoclines). Then
describe, with reference to the isoclines, why the joint movement in each region is the way
it is (why the arrows point the way they do). State the outcome of competition in each
system (name the outcomes and also show on the graphs where the populations will
eventually stabilize). Illustrate, by drawing lines from the equilibrium point to each axis, the
equilibrium population sizes of N1 and N2.

4. The Lotka-Volterra models tell us what happens when competing species are able to reach
equilibrium (both K's are reached). However, there are reasons why equilibrium might not
be reached, so that the model does not apply. What are two of these reasons? Can you
provide an example of each type?

Added by Catalina F.

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