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# Ch. 19 Populations

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Powerpoint on 'Population'

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### Ch. 19 Populations

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