10, 000, draw a direction field and use For the case where k = 1, M = 100, 000 and m = it to sketch several solutions for various initial populations. What are the equilibrium solutions? One can show that k(М-т), M(Po – m)e (Ро — т)е t. т(Ро — М) M P(t) = k(М-т) t M – (Po – M) is a solution with initial population P(0) = Po. Use this to show that, if P(0) < m, then there is a time t at which P(t) = 0 (and so the population will be extinct).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter5: Inverse, Exponential, And Logarithmic Functions
Section5.6: Exponential And Logarithmic Equations
Problem 64E
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Question
A population of fish is living in an environment with limited resources. This environment can
only support the population if it contains no more than M fish (otherwise some fish would
starve due to an inadequate supply of food, etc.). There is considerable evidence to support
the theory that, for some fish species, there is a minimum population m such that the species
will become extinct if the size of the population falls below m. Such a population can be
modelled using a modified logistic equation:
dP
=(1-)(-)
m
dt
M
Transcribed Image Text:A population of fish is living in an environment with limited resources. This environment can only support the population if it contains no more than M fish (otherwise some fish would starve due to an inadequate supply of food, etc.). There is considerable evidence to support the theory that, for some fish species, there is a minimum population m such that the species will become extinct if the size of the population falls below m. Such a population can be modelled using a modified logistic equation: dP =(1-)(-) m dt M
10, 000, draw a direction field and use
For the case where k = 1, M = 100, 000 and m =
it to sketch several solutions for various initial populations. What are the equilibrium
solutions?
One can show that
k(М-т),
M(Po – m)e
(Ро — т)е
t.
т(Ро — М)
M
P(t) =
k(М-т)
t
M
– (Po – M)
is a solution with initial population P(0) = Po. Use this to show that, if P(0) < m, then
there is a time t at which P(t) = 0 (and so the population will be extinct).
Transcribed Image Text:10, 000, draw a direction field and use For the case where k = 1, M = 100, 000 and m = it to sketch several solutions for various initial populations. What are the equilibrium solutions? One can show that k(М-т), M(Po – m)e (Ро — т)е t. т(Ро — М) M P(t) = k(М-т) t M – (Po – M) is a solution with initial population P(0) = Po. Use this to show that, if P(0) < m, then there is a time t at which P(t) = 0 (and so the population will be extinct).
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