Populations Chapter 5 Notes

Describing Populations Range-where the population is located Density and Distribution- Growth rate-how fast the population is growing or not growing Age structure-shows males and females in each age catagory

Growth Rate Birth rate-increases population Immigration-increases population Death rate-decreases growth rate Emigration-decreases growth rate

Exponential Growth Can exponential growth continue?

Logistic Growth Carrying capacity-level of the population that can be supported by resources available.

Questions 1. List two factors which decrease growth rate of a population.

Questions 2. The number of organisms an area can support over a long period of time is called _________________.

Questions 3. The space where a population lives is called its ________________.

Questions 4. What can this age structure chart tell you about the future of this population?

Questions 5. What does this density and distribution show about the human population in the United States?

Limits to Growth Limiting factors-any factor which controls the size of the population.

Density-Dependent Limiting Factor Affect populations most when individuals live close together.

Density-Dependent Limiting Factor Predators Herbivores Parasites and Diseases Competition Overcrowding

Density-Independent Limiting Factor Factors which affect all populations in nearly the same way.

Density-Independent Limiting Factors Storms-tornado, hurricane, large storms Fires Drought Human attempts-mechanical or chemical

Questions 1. Name a factor which limits populations that are very crowded.

Questions 2. How might a fire affect the trees and the squirrels in the forest?

Questions 3. How does competition change as the population increase?

Human Population Growth 1 billion to 2 billion In the next 33 years another 1 billion added

Human Population Since 1999 population growth rate has slowed. What has contributed to the slowing of the growth rate?

Demography The scientific study of human population

Demographic Transition Switching from a high birth rate and death rates to low birth rates and death rates

Future Population Growth 2050 pop could reach 9 billion people Our population is growing more slowly but will not reach zero by 2050

Quiz 1. Which description of population explains where the population can be found?

Quiz 2. What is the maximum population an area can support called?

Quiz 3. Why can’t exponential growth continue indefinitely?

Quiz 4. What does the age structure of a population tell you?

Quiz 5. Name a density-dependent limiting factor.

Quiz 6. Name a density-independent limiting factor.

Quiz 7. What happens to the population of Deer and Trees after a wildfire?

Quiz 8. The study of human populations is _____________.

Quiz 9. The growth rate of the world increased dramatically after Give a reason growth rate increased.

Quiz 10. Since 1999 the growth rate of the human population has decreased. What could be a reason for this?

Bonus Bonus: What caused the dip in population around the 14 th century?