Suppose that the equation dr = kr(M – x) – Er dt models the population of fish in a lake, where harvesting occurs at the rate of Ex fish per month (E a positive constant call harvesting effort). If 0 < E < kM, (a) If 0 < E < kM, show that the population is logistic. (b) What is the limiting population? kM (c) Show that the maximum sustainable harvesting effort is Emax %3D 2

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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Suppose that the equation
dr
= kr(M – 1) – Er
dt
models the population of fish in a lake, where harvesting occurs at the rate of Ex fish per
month (E a positive constant call harvesting effort). If 0 < E < kM,
(a) If 0 < E < kM, show that the population is logistic.
(b) What is the limiting population?
kM
(c) Show that the maximum sustainable harvesting effort is Emax
2
(d) If E 2 kM, show that r(t) → 0 as t → x, that is the lake is eventually fished out.
Transcribed Image Text:Suppose that the equation dr = kr(M – 1) – Er dt models the population of fish in a lake, where harvesting occurs at the rate of Ex fish per month (E a positive constant call harvesting effort). If 0 < E < kM, (a) If 0 < E < kM, show that the population is logistic. (b) What is the limiting population? kM (c) Show that the maximum sustainable harvesting effort is Emax 2 (d) If E 2 kM, show that r(t) → 0 as t → x, that is the lake is eventually fished out.
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