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2.1 POPULATIONS AND RESOURCES
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2.1 POPULATIONS AND RESOURCES P.49
population:
all the individuals of a species
occupy same location at the same time
can successfully reproduce
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EXPONENTIAL GROWTH P.50
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EXPONENTIAL GROWTH P.50 accelerative growth
produces a J-shaped curve
only happens under certain conditions and for a short
time
eg. new habitat, pressure removed, re-introduced
species
cannot be sustained in nature because no unlimited
supply
limiting factors:
limit growth, distribution or amount of population
eg food, temperature, pH
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CARRYING CAPACITY P.51
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CARRYING CAPACITY P.51
size of a population that can be supported
indefinitely by the available resources and
services of an ecosystem
at equilibrium
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CARRYING CAPACITY P.51
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HUMAN ACTIVITIES AND CARRYING CAPACITY
P.52
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HUMAN ACTIVITIES AND CARRYING CAPACITY
P.52
human change ecosystems change carrying
capacities
urban sprawl:
growth of relatively low-density development on the
edges of urban areas
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THE STORY OF THE REDSIDE DACE P.53
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THE STORY OF THE REDSIDE DACE P.53
more urban sprawl
less stream-side shade trees, more run-off
carrying capacity ↓
population ↓
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INTENSIFICATION P. 54
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INTENSIFICATION P. 54
policy to reduce urban sprawl
new development occurs within a city