Population Growth
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Transcript of Population Growth
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Population GrowthAnd Habitat Destruction
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Biodiversity is affected by human population size and resource use.
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1 person is born every 8 seconds
1 person dies every 12 seconds
That is a net gain of one person every 13 seconds.
Global population growth in one year
6.37
6.38
6.39
6.40
6.41
6.42
6.43
6.44
6.45
J A S O N D J F M A M J J
04 05
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5% of our virgin forests are uncut
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2% of our native grasslands are left
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15% of redwood forests are old growth
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Less than 50% of our wetlands remain
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Their existence is being deemed less important than others…
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Understanding population growth In order for growth to
continue forever, we would need an infinite amount of space, energy, and resources.
So what happens to steady growth in a limited space? EXPONENTIAL
GROWTH
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Exponential Growth DEFINITION: The number of
organisms will increase exponentially until nutrients run out.
Typically the first organism splits into two, which then split into four, and then doubles to 8, etc.
Usually doubles or triples, but the human population increases by 1.5x each year.
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So what? In that example, the bacteria was only
limited by the space of the bottle. What about human population, that is
limited by the amount of oxygen, food, energy, space, nutrients, disease, etc? Because of these limiting factors,
populations reach their carrying capacity and do not over-run the world.
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Greatest threats to biodiversity Habitat destruction Invasive species Population growth (humans) Pollution Over harvesting
HINT: Think of the acronym “HIPPO” to remember these five points