chapter 5. determined by ◦ births ◦ deaths ◦ migration
TRANSCRIPT
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PopulationsChapter 5
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Determined by◦ Births◦ Deaths◦ Migration
Population Growth
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Under ideal conditions populations grow exponentially.
Exponential Growth
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Under real conditions populations experience logistic growth.
Limiting factors cause a population to maintain a certain size = carrying capacity
Logistic Growth
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Both biotic and abiotic factors limit the growth of populations.◦ Competition◦ Predation◦ Parasitism and disease◦ Unusual weather◦ Natural disasters◦ Seasonal cycles◦ Human activities
Limits to Growth
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Growth of Aphids
Exponential growth
Steady populationsize
Peak populationsize
Rapid decline
Steady populationsize
Section 5-2
A Density-Dependent Limiting Factor
Competition
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Predation
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Still exponential. Advances in agriculture, medicine, industry
and sanitation have improved survival rates.
Human Population Growth
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Agriculturebegins
Plowingand irrigation
Bubonicplague
IndustrialRevolutionbegins
Section 5-3
Human Population Growth
Human Population Growth
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Estimated to be 9 billion. What will happen when we reach earth’s
carrying capacity?◦ War, famine, pandemics
http://www.peterrussell.com/Odds/WorldClock.php
Earth’s Carrying Capacity