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2.1 POPULATIONS AND RESOURCES
2.1 POPULATIONS AND RESOURCES P.49
population:
all the individuals of a species
occupy same location at the same time
can successfully reproduce
EXPONENTIAL GROWTH P.50
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
CARRYING CAPACITY P.51
CARRYING CAPACITY P.51
size of a population that can be supported
indefinitely by the available resources and
services of an ecosystem
at equilibrium
CARRYING CAPACITY P.51
HUMAN ACTIVITIES AND CARRYING CAPACITY
P.52
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
THE STORY OF THE REDSIDE DACE P.53
THE STORY OF THE REDSIDE DACE P.53
more urban sprawl
less stream-side shade trees, more run-off
carrying capacity ↓
population ↓
INTENSIFICATION P. 54
INTENSIFICATION P. 54
policy to reduce urban sprawl
new development occurs within a city