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Evolution
Lec 13 13Feb02
http://life.uiuc.edu/animalbiology/105/
ID: eee105
Password: prAIRie
Natural selection
selection
N
0
a characteristic
100
Antibiotic resistance in disease bacteria
Insecticide resistance
disease vectors
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Insecticide resistance
disease vectors
agricultural pests
Pests evolve pesticide resistance
r-strategists evolve most rapidly
Genetic variation is “raw material”
Genetic variation is “raw material”
Environment “edits” the population
Genetic variation is “raw material”
Environment “edits” the population
Genetic variation is “raw material”
Environment “edits” the population
Genetic variation is “raw material”
Environment “edits” the population
Genetic variation is “raw material”
Environment “edits” the population
Genetic variation is “raw material”
Environment “edits” the population
Genetic variation is “raw material”
Environment “edits” the population
natural selection
continuous competition
Natural selection
continuous competition
between members of the same species
Natural selection
continuous competition
between members of the same species
Natural selection
Selection forces ?
selection
N
0
a characteristic
100
Natural selection
Selection forces
Density-independent limiting factors
Physical environmental factors
e.g weather
Natural selection
Selection forces
Density-independent limiting factors
Physical environmental factors
Density-dependent limiting factors
disease
predation
Food chain
producer
E
primary
consumer
secondary
consumer
parasites respiration
parasites
parasites decomposition
autotroph
herbivore
predator
each trophic level regulates population of its prey
each trophic level selects its prey
Natural selection
Selection forces
Density-independent limiting factors
Physical environmental factors
Density-dependent limiting factors
disease
predation
competition between species
Competition between species
Competition between species
pests vs. us
Competition between species
pests vs. us
weeds vs. us
Natural selection
Selection forces
Density-independent limiting factors
Physical environmental factors
Density-dependent limiting factors
disease
predation
competition between species
Theecosystem
ecological theater
An
The evolutionary drama
But, how can “random” processes
design complex structures?
But, how can “random” processes
design complex structures?
Isn’t this like expecting a bunch
of monkeys locked in a room with
typewriters to eventually type out
Hamlet’s soliloquy?
Actually one monkey with a computer
could do it -- if it were arranged
like natural selection
computer
monkey, typing
Don’t
Save
q
Don’t
Save
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Save
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t
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tk
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to
to
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toq
to be or not to be
that is the question
to be or not to be
that is the question
Evolution by Natural Selection is not
random
Selection is non-random