1. Populations

2. I. How Populations grow A. Describing populations 1. Geographic Range- Space where it lives

3. 2.Density-# of individuals of a species per unit area

4. 3.Distribution-shows how organisms are spread across their range

5. 4. Growth Rate- tells whether a population is getting bigger, smaller or staying the same

6. 5.Age structure-#s of males and females in different age groups of a population

7. B.Population Growth-changes based on how many individuals are added or removed 1. How? a. Birthrate/death rate b. immigration/emigration

9. C.Exponential Growth-the larger a population grows, the more quickly it grows—graph looks like a J

10. D.Logistic growth-a growth pattern in which a Population’s growth rate slows down or stops following a period of exponential growth---graph shaped Like an S

11. E. Carrying Capacity 1) the greatest number of individuals an Environment can support 2) the degree to which a population is limited in size by its resources

13. II. Limits to Growth A. Limiting Factors Anything that causes the growth Of a population to decrease Ex: food, predators

14. 1. Density-Dependent Limiting factors a. Depends on population size 1. predator-prey cycle

15. 2. herbivores

16. 3. Parasites and disease

17. 4. Competition

18. 5. Overcrowding

19. 2. Density Independent Factors Affects populations regardless of size Ex: weather, natural disasters

20. III. Human Population growth A. Historical Overview

21. B. Patterns of Human population Growth 1.Demography - the scientific study of human populations

22. 2. Demographic Transition- A change from high birth rates and death rates to low birthrates and death rates

23. 3.Age structure

24. 4. Future Population growth