GEOG 201 - Lecture 10 (Equilibrium)
Prey population decreases if P>r/a (intrinsic rate of increase/) ~ equilibrium conditions
Use these as zero population growth isoclines ~ look at to know when predator populations
are not changing, increasing, decreasi
GEOG 201 - Lecture 9 (Mathematical models)
Population cycles can be caused by feedings relations, such as three-way interaction between
predators, herbivores, and plants
A specific effect of exploitation can be population cycle
Lemmings have huge populat
GEOG 201 - Lecture 8 (Preferences)
Circle=species, arrows = flow of energy
Indirect/exploitation competition - get energy from common resource
There are multiple levels of exploitative relationships
Over half of organisms obtain energy from feeding on ot
GEOG 201 - Lecture 7 (Models of Exclusion)
Using the Model to explain why competitive exclusion occurs
Looking at graph, competitive exclusion occurs when,
If you know alpha and beta, then you should know, depending on what the capacity are, if
they can c
GEOG 201 - Lecture 6 (Coexistence)
Competitive Exclusion: when isoclines do not cross, competitive exclusion results
Depending on which isocline is above the other, either species 1 or species 2 drives the other
to extinction
In (a), the final outcome of
GEOG 201 - Lecture 5 (Coexistence)
Coexistence when species compete for the same resources, we can use the mathematical
model to look their dynamics
If let dN/dt = 0 (equilibrium) not increasing or decreasing
When species 1 goes to 0, species 2 is K1/alp
GEOG 201 - Lecture 4 (Modelling)
Competition can be modelled using mathematical equations
Lotka-Volterra competition model : the first model of competition
Looks like logistic equation
Difference? alpha x N2 term N2 is population size of second species
P
GEOG 201 - Lecture 3 (Morphological Index)
Morphological index the larger the number, the more similar the two competitors are
morphologically; the more negative = more different (more different = higher growth rate)
The outcome of competition can be alt
GEOG 201 - Lecture 2 (Character Displacement)
Why show resource partitioning? Because of character displacement- results from when
natural selection influences the morphology of competing species
When species compete, they are being harmed. This is the f
GEOG 201 - Lecture 1 (Principles in Ecology)
Competitive exclusion principle: two species that use a limiting resource in the same way
cannot coexist
If the overall ecological requirement of a species (ecological niche) are very similar to those
of a sup