Character Describe Displacement in this case
1
Modeling Competition
The logistic equation can be modified to account for the effects of
interspecific competition:
= competition coefficient of species 2 wrt species 1
= competition coefficient of species 1 wrt species 2
K1 - N1 - a N 2
dN1
= r1N1
dt
K1
K 2 - N 2 - b N1
dN 2
= r2 N 2
dt
K2
You do NOT need to memorize the logistic and competition equations, just understand
them and know what the terms mean. You DO need to know the exponential.
Lotka-Volterra model of Competition
2
K1 - N1 - a N 2
dN1
= r1N1
dt
K1
The competition population growth equations are best
described as
a)
b)
c)
d)
e)
Exponential growth modified by a correction for
competitive interactions
Exponential growth modified by a correction for
carrying capacity and competitive interactions
Logistic population growth modified by how much
predation of sp2 affects sp1
Logistic growth modified by a coefficient that
represents intraspecific competition
None of these.
3
Predation &
co-evolution
Batesian mimicry
Scarlet Kingsnake (top)
Eastern coralsnake (bottom)
Figure 1.25
Figure 53.20
4
Species-Area tropical Relationship
If regions have more surface area, what do you
predict about S in the tropics?
5
Group Activity (12 minutes!)
Download from Tsquare/Resources/Lectures/16 POGIL
species diversity.pdf
Assign roles (different from last time).
Have one member login to Piazza.
No other websites allowed: books and
internet closed!
Get a worksheet from an instructor.
The model predicts that small islands far from
the mainland support
Nearshore
a) The fewest species
b) The most species
c) An intermediate number of
species
d) The model cannot make
predictions about this.
Remote
7
Given what you know about island biogeography and global patterns in
species richness from the reading, which island is expected to have a
higher species richness?
a)
b)
c)
d)
e)
More remote (farther from mainland) islands will have higher species
richness than less remote ones.
Smaller islands are expected to have more species than larger ones.
Recently created volcanic islands are expected to have more species
than older islands.
Islands at lower latitudes are expected to have more species richness
than islands at higher latitude.
None of these.