1. Population Dynamics

2. Population dynamics The study of how populations change in size.
Includes
Growth rate
Size
Density
Age structure

3. Population change =(Births + Immigration) – (Deaths + Emigration)
Uncontrolled growth is called exponential growth.
Populations double every generation
1generation=2
2nd Generation=4
J Curve

4. Factors that control growth
Biotic potential= The ability or capacity to grow.
Factors that change –food sources-light nutrients-disease resistance-Ability to aquire food-K and R strategies Resources (land)
Intrinsic rate of growth (r) =the rate that a population would grow without any factors.
R strategist have the fastest.
Environmental Resistance- All of the factors that limit growth.

5. Carrying capacity
(K)
The maximum number of individuals that may live in an area sustainably.
If organisms exceed the carrying Capacity they tend to destroy other animals and eventually them selves.

6. As populations reach the Carrying capacity
As populations reach the Carrying capacity the environmental resistance increases thus slowing down population growth.

7. The reality is….. Populations tend to overshoot the carrying capacity.
Going past the CC
Leads to the death phase-population decline

8. The amount of decline
The amount a population exceeds a Carrying Capacity is equal to the amount of decline that population will have below the carrying capacity.

9. Reproductive lag time
The amount of time required for the birth rate to fall and the death rate to rise.

10. Population Density An indicator of people per square mile
A better indicator of over population.
Takes into account the impact each person has on a specific area of land
People/square miles

11. Age structures Diagrams of populations broken down in to various ages.
Broken down into gender.
3rd Tend to have larger amounts of children
1st older and mixed.
3rd More w die in middle life. Men die in old age..

12. Demographic change
As populations go from third world too first world the age structure will also change.

13. Types of age structures
Rapid growth
3rd world

14. Slow growth

15. Zero Growth
Developed countries

16. Negative population growth
Developed worlds

17. Assignment
Page 309 questions 1-2 critical thinking.

18. Ways to control population growth
1 Education not always work
2 Ath oritarian restrictions 3 4 5 6 7 8 9