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How Populations Grow
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Characteristics of Populations
3 important characteristics of a population: geographic distribution, density, and growth rate Geographic distribution – range; area inhabited by a population *Density – number of individuals per unit area Growth rate – the increase or decrease in numbers of individuals over time
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Population Growth 3 factors affect population size: number of births, number of deaths, and number of individuals that enter or leave the population Populations increase or decrease depending on how many individuals are added or taken away
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Population Growth Immigration – individuals move into an area [IN]
Emigration – individuals move out of an area [EXIT]
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Exponential Growth Occurs when individuals in a population reproduce at a constant rate Increases slowly at first, then as the population becomes larger, it increases faster “J”-shaped curve on graph With unlimited resources and ideal conditions… population becomes nearly infinite does not continue very long
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Logistic Growth When a populations growth slows or stops following a period of exponential growth This happens when resources become less available “S”-shaped curve on graph Carrying capacity = the largest number of individuals of a certain species a given environment can support
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