Database Reference
In-Depth Information
10.4 Questions and Tasks
1. Explore the impacts of extreme weather conditions (e.g. a period of extreme
summer temperatures or drought) on zebra mussel dynamics.
2. How would you introduce the impacts of a chemical eradication program on
zebra mussels? Can you get rid of all the mussels from the lake? If so, for how
long?
ZEBRA MUSSEL MODEL
ADULT 1(t)
=
ADULT 1(t
−
dt)
+
(GROWTH 1
−
GROWTH 2
−
DEATH A1) * dt
INIT ADULT 1
=
0
{
Number of Individuals
}
INFLOWS:
GROWTH 1
=
(1
−
DEATH RATE 1)*JUVENILE
{
Individuals per Month
}
OUTFLOWS:
GROWTH 2
=
(1
−
DEATH RATE 2)*ADULT 1
{
Individuals per Month
}
DEATH A1
=
DEATH RATE 2*ADULT 1
{
Individuals per Month
}
ADULT 2(t)
=
ADULT 2(t
−
dt)
+
(GROWTH 2
−
GROWTH 3
−
DEATH A 2) * dt
INIT ADULT 2
=
0
{
Number of Individuals
}
INFLOWS:
GROWTH 2
=
(1
−
DEATH RATE 2)*ADULT 1
{
Individuals per Month
}
OUTFLOWS:
GROWTH 3
=
(1
−
DEATH RATE 3)*ADULT 2
{
Individuals per Month
}
DEATH A 2
=
DEATH RATE 3*ADULT 2
{
Individuals per Month
}
ADULT 3(t)
=
ADULT 3(t
−
dt)
+
(GROWTH 3
−
DEATH A3) * dt
INIT ADULT 3
=
0
{
Number of Individuals
}
INFLOWS:
GROWTH 3
=
(1
−
DEATH RATE 3)*ADULT 2
{
Individuals per Month
}
OUTFLOWS:
DEATH A3
=
1.0*ADULT 3
{
Individuals per Month
}
JUVENILE(t)
=
JUVENILE(t
−
dt)
+
(SURVIVE
−
GROWTH 1
−
DEATH J)
*dt
INIT JUVENILE
=
100
{
Number of Individuals
}
INFLOWS:
SURVIVE
SUSTAINABLE POPULATION)
THEN MIN(SURVIVE POT,SUSTAINABLE POPULATION-TOTAL
POPULATION)
ELSE ((1
=
IF (TOTAL POPULATION
<
(TOTAL POPULATION-SUSTAINABLE POPULATION)/
TOTAL POPULATION)ˆ2)*SURVIVE POT
−
{
Number of Individuals per
Month
}
OUTFLOWS:
GROWTH 1
=
(1
−
DEATH RATE 1)*JUVENILE
{
Individuals per Month
}
DEATH J
=
DEATH RATE 1*JUVENILE
{
Individuals per Month
}
