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Ch. 19 Populations
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Ch. 19 Populations

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Powerpoint on 'Population'

Powerpoint on 'Population'

Published in: Technology, Health & Medicine

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  • 1. Populations Understanding populations
  • 2. Properties of populations
    • Group of organisms of same species living together at a particular place at a time is ‘ population ’.
    • Example: population of cows.
  • 3. Population size
    • Population in a small area (1km2) is counted and then large area (50km2)can be calculated .
  • 4. Population Density
    • The number of individuals per square unit area is ‘ population density ’
  • 5. Global Human population density
  • 6.  
  • 7. Dispersion
  • 8. Population Dynamics
    • Population changes over a period of time
    • Birth rate is the number of births in a period of time (example: 20/1000 per year)
    • Death rate is number of deaths in a period of time (example: 3/1000 per year)
    • Life expectancy makes a difference in death rate
  • 9. Population Growth Rate
    • Change in the population’s size at a given time is ‘growth rate’ .
    • Growth rate (r)= birth rate (b)-death rate (d)
  • 10. Population growth rate in an area
    • Birth and immigration increase the population
    • Death and emigration decrease the population
    • Growth rate r = (b - d)+ (i - e); where i=immigration, e=emigration
  • 11. Age Structure