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6.3: Population Dynamics: Natural Change

6.3: Population Dynamics: Natural Change. World Geo 3200/3202 May 2011. Outcomes. 6.3.1 define the terms natural change, natural increase, and natural decrease; (k) 6.3.2 express population change in mathematical terms; (a)

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6.3: Population Dynamics: Natural Change

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  1. 6.3: Population Dynamics: Natural Change World Geo 3200/3202 May 2011

  2. Outcomes • 6.3.1 define the terms natural change, natural increase, and natural decrease; (k) • 6.3.2 express population change in mathematical terms; (a) • 6.3.4 examine the relationship between birth rate and death rates to determine natural change in a population; (a) • 6.3.5 analyze factors that affect birth rates; (a) • 6.3.6 analyze factors that affect death rates; (a) • 6.3.9 describe the factors that contribute to a graying of the population; (k) • 6.3.10 project future population trends from data provided. (i)

  3. Overview • There are only two factors that can increase a population: births and immigration.  Natural change in a population considers only births as a means of increasing the population. • Likewise there are only two factors that can decrease a population: deaths and emigration.  Natural change in a population considers only the deaths as a means of decreasing the population.

  4. Natural Change • Natural change in a population is defined as the difference in births and deaths. • Natural Change= difference in births & deaths • Natural Increase occurs when there are more births than deaths • Natural Decreaseoccurs when there are more deaths than births

  5. Rate of Natural Change • Population growth rate considers all aspects of population change.  However Rate of natural increase (RNI) takes into account only birth rate and death rate. • Birth Rate (BR) is measured as the number of births (in one year) per 1000 people. •       The formula is     BR =        births      X 1000                                            population • Death Rate (DR) is measured as the number of deaths (in one year) per 1000 people. •       The formula is      DR =      deaths     X   1000                                            population

  6. Rate of Natural Increase • Rate of Natural Increase  (RNI) is a measure of how fats the population is increasing due only to the births and deaths. • The formula is     RNI =  BR – DR

  7. PGR & Standard of Living • Generally speaking stable populations are characteristic of a high standard of living due to: • low birth rate caused by good family planning, access to birth control, financial planning, education, etc. • Low death rate caused by good medical care, nutrition, education etc.

  8. PGR & Standard of Living • Generally speaking an expanding population is characteristic of a lower standard of living: • high birth rate due to poor access to birth control, lack of education etc.; • high death rate due to poor medical care & nutrition

  9. Assigned Readings • "Natural Changes in Populations" on pages 310-311 of your text book.

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