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Positive Population Growth

Histograms: a special type of graph used to represent the changing population of a certain country. Negative Population Growth The children are outnumbered by the adults. Average of less than two children per family. Positive Population Growth

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Positive Population Growth

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  1. Histograms: a special type of graph used to represent the changing population of a certain country Negative Population Growth The children are outnumbered by the adults. Average of less than two children per family. Positive Population Growth The children outnumber the adults of child-bearing age. More than two children per family. Zero Population Growth The children are fairly equal to the number of child-bearing adults. Average of two children per family.

  2. Histograms: Positive Growth • Developing countries usually show positive growth. • The aged make up a very small population. • Health care may be inaccessible to many, or may be of poor quality. • Economy may not be stable. • Most of population lives at poverty level. • War may be a factor that affects young adult male population

  3. Histograms: Zero Growth • The population is relatively stable, neither growing nor shrinking. • Developed countries with good health care. • Good sized elderly population. • Stable economy with most families being middle class.

  4. Histograms: Negative Growth • Population will experience decrease in near future due to fewer children being born. • Well developed countries. • Larger elderly population • Typically “rich” country. • Future may be economically iffy – aging population relies on government health and pension programs that are supported by taxes of working people.

  5. Histograms Affected by 3 things: • Number of births • Number of deaths • Number of individuals that enter or leave a population.

  6. GROWTH CURVES • By looking at the growth of a population over time, how does it occur?

  7. Exponential Growth Exponential growth ~ Occurs when individuals in a population reproduce at a constant rate. • Occurs when there are unlimited resources. • Graph shows a J-shaped curve. • This occurs until a limit on a resource is reached

  8. Logistic Growth Logistic Growth~ Occurs when a population slows its growth after a period of exponential growth. • Occurs when a limiting factor is introduced. • Graph shows an S-shaped curve. • Carrying capacity ~ • The maximum number of individuals in a population that can be supported by an ecosystem.

  9. Limiting Factors: Anything that limits the size of a population • Density dependent limiting factors ~ A factor that depends on population size. • Disease • Parasites • Predators • Competition • Density independent limiting factors ~ Any large-scale factor that can affect a population that doesn’t depend on the population size. • Natural disaster (Earthquake, flood, tornado, etc.) • Long term change in weather

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