Carrying Capacity Population Growth Human Population Biodiversity
Transcript of Carrying Capacity Population Growth Human Population Biodiversity
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Ecology – Part 3
• Carrying Capacity • Population Growth • Human Population • Biodiversity
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Exponential Growth Curve
Population Growth of Houseflies 1 million
500,000
100 One year
Popu
latio
n siz
e
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Carrying Capacity vs. Exponential Growth
• J-shaped curve S-shaped curve
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Carrying Capacity
• The maximum number of organisms that can be supported in an area…
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Carrying Capacity
• This graph shows an S-curve
• As the population size approaches the carrying capacity (dashed-line), the growth slows down (note the blue arrows)
Time
Population
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Figure 52.19 Population cycles in the snowshoe hare and lynx
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Figure 41.9 Bulk-feeding: a python
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Certain limiting factors are related to population density (size)…
• Density-dependent factors: – They depend on population size. – Examples: Food availability
Disease Predators
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• Density-independent factors – These do not depend on population size.
Examples: Floods, drought, natural disasters.
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Human Population
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Human Population (con’t)
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Age Structure – number of people at each different age