1. Population Growth
Biotic Potential=
-promotes positive growth
-intrinsic factors(litter size, gestation)
Environmental Resistance=
-limits growth
-extrinsic factor(weather, food supply)

2. Patterns of growth
Exponential growth (J shaped curve)
• biotic potential(rm)=maximum value

3. Logistic growth (S shaped)
K=carrying capacity=population size that is
based on number of resources available

4. Limiting factors:
Density dependent:
-competition
-disease
-predation
-food
Density independent:
-weather
-catastrophes

5. Natural Selection:
• limiting factors place
stresses on a population
• the best adapted organisms
will survive and get to
reproduce and pass on their
genes with the adaptation
to their offspring
• over long periods of time
this can lead to a change in
species

6. Population Growth
Biotic Potential=
-promotes positive growth
-intrinsic factors(litter size, gestation)
Environmental Resistance=
-limits growth
-extrinsic factor(weather, food supply)

7. Patterns of growth
Exponential growth (J shaped curve)
• biotic potential(rm)=maximum value

8. Logistic growth (S shaped)
K=carrying capacity=population size that is
based on number of resources available

9. Limiting factors:
Density dependent:
-competition
-disease
-predation
-food
Density independent:
-weather
-catastrophes

10. Natural Selection:
• limiting factors place
stresses on a population
• the best adapted organisms
will survive and get to
reproduce and pass on their
genes with the adaptation
to their offspring
• over long periods of time
this can lead to a change in
species

11. • proportionally massive eyes
making vision acute for locating
prey
• movable ears for better hearing
making them good nocturnal
hunters
• can rotate their heads a full 180
degrees to help them avoid
predators such as wild cats
• Long back legs to help them
jump twenty feet, an important
survival skill in the jungle
• Long tail providing power for
jumping and holding onto tree
Ex:Phillipine Tarsier

12. Survivorship curves:
-based on a cohort of individuals from birth until
death
-cohort=a group of individuals of the same age
-survivorship curves are meant to show the
number of individuals surviving at each age
for a particular species
-three types of curves

13. Type 1=good early survival, die of old age, low
birth rates, provide lots of parental care
(humans)
Type 2=die at constant rate regardless of age
(birds, lizards)
Type3 =poor early survival,
survival thatimproves with
age, lots of offspring, low
parental care
(fish,plants)

14. Life History Patterns:
r selected species: species inhabiting fluctuating
or unpredictable environments-environments
keep populations below carrying capacity (lots
of predation, competition over resources)
k selected species-species inhabiting
stable, predictable environments-keep
population size near carrying capacity and
resources are scarce