click to play essential questions what are the factors that effect population growth? what are some...
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POPULATION DYNAMICS….7billion & Counting
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Essential Questions
What are the factors that effect population growth?
What are some of the effects that overpopulation have on an environment?
LEVELS OF ORGANIZATIONsmallest unit of living thingsgroup of similar cells organized to work together
group of different kinds of tissues working together
group of organs working togetherone individual living thingall organisms of the same kind living in one area
all interacting populations in an ecosystem
all living and nonliving things interacting within a certain area
large region with typical plants and animals that includes several ecosystems
cell
Population
Dynam
ics
Population Dynamics
How populations change in size due to birth rate/immigration and death rate/emigration and limiting factors ( abiotic and biotic)
Birth Rate:(number of live birth per 1000)
How does death rate
affects population
size?
Death Rate ( number of
death per 1000)
How does death rate
affects population
size?
Immigration: ( movement into an area)
How does immigration
affects population
size?
Emigration:(movement out
of an area)
How does emigration
affects population
size?
Population Size
What goes up must come down
•Increases in population: through birth or immigration
•Decreases in population: through death or emigration.
Change in Population =
Birth Rate +
Immigration
- Death Rate +
Emigration
Logistic or Exponential Growth Curve?
“Boom and Bust” “Boom then stable”
Can you think of something in nature that exhibits exponential growth? Logistic growth?
Population will follow two general paths: • When faced with unlimited resources it will grow exponentially
• When faced with limited resources it grow logistically
Po
pu
lati
on
siz
e (N
)
Time (t)
Carrying capacity (K)
Environmentalresistance
Biotic potential
Exponential growth
• Populations grow rapidly with ample resources (biotic potential), but as resources become limited (environmental resistance), its growth rate slows and levels off
• Carrying Capacity (K) is the maximum number of organism that an area can support
Logistic GrowthCan you think of some resources that could limit population growth? Characterize these resources as abiotic or biotic?
Exponential and Logistic Population Growth: J-Curves and S-Curves
• As a population levels off, it often fluctuates slightly above and below the carrying capacity.
Mung Seed Activity
By the year 2020, 9 to 10 billion humans are expected to inhabit the planet. Do you think the world is overpopulated?
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