Unit 5 Human Population Dynamics


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Unit 5 Human Population Dynamics

  1. 1. Human Population Dynamics APES
  2. 2. Introduction Geoffrey Ashton
  3. 3. Mathematics of Population Growth Victoria Owen
  4. 4. Determinates and Demographics Nicholas Cochrane
  5. 5. World Population Growth Through History McKenna Chase
  6. 6. Population Growth and Environment
  7. 7. Consumption People consume resources such as: ● ● ● ● Land Food Water Soils Over-consumption uses up or severely depletes supplies of both renewable and non-renewable resources faster than they can replenish themselves.
  8. 8. Emission People emit wastes as a product of our consumption including: ● ● ● ● Air Pollutants Water Pollutants Toxic Materials Greenhouse Gases Some wastes, such as untreated sewage and many pollutants, threaten human health.
  9. 9. Pollution Economies tend to become more high-polluting during early stages of economic development because they first adapt inexpensive technologies that are relatively inefficient-simple manufacturing systems and basic consumer goods such as cars.
  10. 10. Urbanization and Megacities Jennifer Ellis
  11. 11. Consequences of Demographic Change Maribeth
  12. 12. What is Demographic Change? Demographic change is the calculable shift in the characteristics of a geographically-defined population. These include changes in population age profile, racial makeup or family structure.
  13. 13. What are the Consequences? “The environmental consequences of population growth are a subset of broader interactions between population and national economic development.”
  14. 14. Large Families
  15. 15. Dependents Workers
  16. 16. Dependency Ratio The ratio of non-workers (children and retirees) to workers in a human population: the higher the ratio, the greater the dependency load.
  17. 17. Demographic Dividend A rise in the rate of economic growth due to a rising share of working age people in a population.
  18. 18. Demographic Convergence and Human Lifespan Trends Daniel Monsalve
  19. 19. Demographic Convergence Demographic convergence is the narrowing of the difference between developed and developing countries for things like fertility rates and life expectancy. 1950 life expectancy difference from developed and developing countries was 25 years. Now the gap has increased to 12 years.
  20. 20. What’s Slowing the Progress Many factors hinder the development of impoverished nations. ● AIDS pandemic/malaria ● Wars ● Bad agricultural conditions ● Geographic/economic isolation
  21. 21. Ideas to Improve Some economists think that if wealthy countries doubled their foreign aid from $80 billion to $160 billion then poverty could be eliminated by 2025. Many people in wealthy countries are living longer healthier lives than were ever possible before. Life expectancy is expected to rise and could potentially reach almost 100 by the end of the century.
  22. 22. Population Growth & Human Population Change Karis Heidebrecht
  23. 23. Reasons some populations grow slower than others: Internal Factors: ● hormone regulation ● maturity ● body size External Factors ● food and habitat accessibility ● predator populations
  24. 24. Population Growth Key Terms Density-dependant limitations: A limiting factor of a population wherein large, dense populations are more strongly affected than small, less crowded ones. Density-independent limitations: A factor that affects the size of a population independent or regardless of the population density Environmental resistance factors: Things that lower population density and growth. Logistic Growth: When a population’s growth rate changes to match it’s local conditions.
  25. 25. Logistic Growth Equation K is the environment’s carrying capacity, N is population size, is the change in population size over time, and (rN) is exponential growth over time.
  26. 26. Factors in Human Population Change Emigration - population movement from a place Immigration - population movement to a place Replacement birth rate - the number of kids a couple has to replace them in a population Death rate - population death due to many reasons
  27. 27. Conservation Biology Conservation Biology 5 Steps To A 5: 138-139 Per. 2
  28. 28. Isolated Population ● Isolated Population- POpulation with very little genetic mixing. ● Things that barely disturb a diverse population can destroy an isolated population. ● In order for recessive traits to balance out, a certain number of individuals with dominant and healthy traits needs to reproduce. ● With limited numbers of breeding pairs on an island, a mutation would be passed on through generations unequally. ● When a species is isolated long enough, loss of genetic diversity may affect reproduction. ● EX: Grizzly Bear Pop. in 1800 was 100,000 but today there are less than 1,000.
  29. 29. Impacts of Population Growth ● Land Use- Land overuse results from economic circumstances, poor land laws, and cultural customs. ● Resource Distribution- People that redistribute food from growers, food processors, and distributors and then make the food available to the needy. ● Population Control- Efforts to control population include birth control and education.
  30. 30. 5 Steps Key Terms Dani Beck Do the key terms at the beginning of the 5 Steps Chapter 11 as well as the key terms in the Habitable Planet.