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NAME: _______________________________________________________
LAB INSTRUCTOR:____________________________________________
1
Page score_______
ECOL 302 – Second midterm examination – Fall 2006
Put your name at the top of each page NOW.
All questions are worth 8 points each.
ANSWER IN THE
SPACE ALLOTTED OR LESS. Use graphs or equations in your answers wherever you want or need to.
Use correct units where applicable.
You will need
some
of the following equations:
dN/dt = rN
dN/dt = rN[(K  N)/K]
dN/dt = rNt[(K  N
t
J
)/K]
N
t+1
=
λ
N
t
G =
Σ
l(x)m(x)x /
Σ
l(x)m(x)
N
t
= N
0
e
rt
lnN
t
= lnN
0
+ rt
r = b – d
r = lnR
0
/G N
t+1
= Nt(1 + r
d
(K  N
t
)/K))
R
0
=
Σ
l(x)m(x)
l(x) = S(x)/S(0)
(1) What is the equation that is used to determine how many individuals are added to a population that is
exhibiting Malthusian (exponential) growth:
dN/dt = rN
(N
t
= N
0
e
rt
would be used to predict population size at time t)
Briefly state one of the assumptions that we make when using the Malthusian growth equation:
Closed population; constant environment; all individuals the same; continuous
(2)
Describe or name the type of population dynamics illustrated in figures A through C (for C, focus on
the part of the curve that is in the dashed circle).
(A)
_
negative exponential growth
_________
(B)
___
logistic growth
_______________
(C) ____
Allee effect
_____________________
(D) On figure B below, label the equilibrium point.
Mark and label where the population would
be growing at a maximal rate
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View Full DocumentNAME: _______________________________________________________
LAB INSTRUCTOR:____________________________________________
2
Page score_______
N
dN
dt
0

+
(A)
N
dN
dt
0

+
(B)
N
dN
dt
0

+
(C)
(3)
You introduce 5 individual fruit flies of the species
Ceratitis capitata
to an incubator filled with ripe
apples to see how fast this species of fruit flies can grow.
You provide ample food to the fruit flies,
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 Spring '08
 PAVAO

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