1. Bell work Week 35 Pick a science word and write the definition.
Chapter 14 in Life Science book
Check calendar!
Poster board due 5/1

2. Title of notes: Carry Capacity/Limiting Factors
Pg. 37 & 38 RS
Goal for the lesson: write on your self assessment worksheet
I can explain what factors determine if a population will grow or decline.

3. What is a Limiting Factor?
Limiting Factors are…
(two similar definitions)
conditions of the environment that limit the growth of a species.
biotic and abiotic factors that prevent the continuous growth of a population.

4. What is a Limiting Factor?
Populations would continue to increase if they had all of the resources they require in unlimited amounts, but there are always factors that limit their increase.
Limiting factors control
population growth.

5. Density-dependent limiting factors
A factor that stops a populations growth and is influenced by pop. density.

6. Density-independent limiting factors
A factor that stops a populations growth and isn’t influenced by pop. density.

7. What is Carrying Capacity?
Carrying capacity is the number of individuals of a species that an ecosystem can support.

8. What is Carrying Capacity?
Because of these limiting factors, each ecosystem has a finite capacity for growth connected to its carrying capacity.

9. Carry capacity
When a population is BELOW its carrying capacity, it will INCREASE in size
Birth rate exceeds death rates
But if it increases too much and rises ABOVE its carrying capacity, it will DECREASE in size
Death rate exceeds birth rate
This happens over and over… but the increases and decreases get smaller and smaller…
Until eventually, the population size BECOMES STABLE AT THE CARRYING CAPACITY
Birth rate = death rate

10. Population Growth Curves
Exponential Growth - J
Logistic Growth - S

11. J-shaped curve (exponential growth)
Draw this on pg. 37 LS Nu m b e r
J-shaped curve (exponential growth)
Carrying Capacity (k)
S-shaped curve (logistic growth)
Ok so
Time

12. Exponential Growth Occurs when there is unlimited resources
Causes a population to increase in size rapidly
J-shaped curve
No limiting factors!
Biotic potential = the estimated population size under optimal environmental conditions

13. Logistic Growth Occurs when there are limited resources
Causes a population to grow and then stabilize at carrying capacity (k)
S-shaped curve
Limiting factors control population size (aka environmental resistance)