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Lecture 10-population

Lecture 10-population - Population Growth An Ecological...

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Population Growth An Ecological Problem
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Population Ecology Population A group of individuals of one species that live in a particular area . Population Characteristics Size Density Distribution Sex Ratios Age Structure
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Population Ecology Age structure Number of individuals in different age classes Reproductive age Pre-reproductive age Post-reproductive age
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Age Structure Diagrams
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Population Growth Growth Rate (crude birth rate + immigration rate) – (crude death rate + emigration rate) Rates are expressed as individuals per 1000 To express as a percentage: growth rate X 100% ( ex. 20/1000 X 100% = 2% )
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Exponential growth A stable rate of growth leads to exponential growth. As the population size increases, the same percentage increase becomes a larger total increase.
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Exponential Growth in a population J-curve Occurs when a population is small and environmental conditions are ideal.
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Limiting Factors Physical, chemical and biological factors that limit the amount of growth that is possible Space Nutrients Predators All limiting factors together make up the “environmental resistance”. Carrying Capacity The maximum population size that an environment can sustain
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Logistic Growth Curve (S-curve) Environmental Resistance determines Carrying Capacity Carrying Capacity can change when limiting factors change
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Increasing our carrying capacity Technology has allowed us to raise Earth’s carrying capacity for our species time and again.
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