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Human Population Dynamics

Human Population Dynamics. Section4.2 pg. 100-103. What is demography?. The study of human population size, density, distribution, movement, birth rate and death rate. How is human population growth different than the growth of organisms?.

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Human Population Dynamics

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  1. Human Population Dynamics Section4.2 pg. 100-103

  2. What is demography? • The study of human population size, density, distribution, movement, birth rate and death rate

  3. How is human population growth different than the growth of organisms? • If compared to the growth of organisms such as bacteria or fruit flies, it is labeled differently because humans can consciously change their environment to make it more suitable for life

  4. How is growth calculated? • Factors that determine growth rate: • Birthrate: the number of live births per 1000 in a given year • Death rate: the number of deaths per 1000 in a given year • Immigration: movement of individuals into a population • Emigration: movement of individuals out of a population

  5. The actual calculation • Population Growth Rate (PGR)= (Birthrate + Immigration) – (Death rate + Emigration) • If the rate is zero, it does not mean that the population is not changing; it means new individuals enter at the same rate individuals leave • If the rate is above zero, it means that new individuals are entering; therefore the population is growing • If the rate is less than zero, than fewer individuals are entering the population than are leaving

  6. What is Doubling Time? • The time needed for a population to double in size, which is dependent on current population and growth rate • Slow or Negative Growth Rate = means it will take a country a long time to double in size (Ex. Developed countries) • Rapid Growth Rate = means a country’s population will double in size at a shorter time (Ex. Developing Countries)

  7. What is age structure? • Refers to portion of population that are in different age categories • Age structure graphs can show you: • approx, how many males and females are in a population • How many people at each age level • A typical graph of a rapidly growing population has a wide base because of the number of children and teenagers • A stable population will have a fairly equal percentage in each age category

  8. Sample Age Structure Graphs http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookpopecol.html

  9. How does ecology affect human population growth? • Unstable Populations are concerned about the most basic needs • Stable Populations are concerned with maintaining healthy conditions Some of the things populations need are uncontaminated water for drinking and farming, sewage facilities, ability to maintain food supply for growing population

  10. What if populations grow rapidly without regard to food availability? • Food/water can become scarce and contaminated • Amount of waste becomes too much to handle • Can lead to stress on current resources • Can contribute to spread of disease

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