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Do now. Describe the ecosystem of Easter Island. What are some factors that limited how many people can live on Easter Island?. Do Now. What are three factors that might limit the growth of a population of lions on the savannah?. Carrying capacity.

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do now
Do now
  • Describe the ecosystem of Easter Island.
  • What are some factors that limited how many people can live on Easter Island?
do now1
Do Now

What are three factors that might limit the growth of a population of lions on the savannah?

carrying capacity
Carrying capacity
  • The maximum population size of a particular species that an environment can sustain stably
  • (how many individuals of a population can live happily in a place)
carrying capacity can be expressed as population density
Carrying capacity can be expressed as population density

Population density = population ÷ area

population growth is limited by
Population growth is limited by:

Abiotic factors – non-living things (water, soil, sun)

Biotic factors – living things (plants, animals, bacteria)

population growth is limited by1
Population growth is limited by:
  • Availability of matter and energy (food if you’re an animal, sunlight and nitrogen in the soil if you’re a plant). Also water.
  • Size of the environment (do you have enough space)
  • Presence of competing organisms (other organisms competing with you for matter and energy and space
  • Presence of predators (eating you)
some factors that limit growth depend on population density some do not
Some factors that limit growth depend on population density, some do not
  • Density independent factors affect populations no matter how dense they are
    • Natural disasters
    • Temperature
    • Sunlight penetrance in the ocean
    • Human activities
  • Density dependent factors only affect populations when they reach a certain density
    • Competition for resources
    • Disease and parasites
    • Crowding
    • stress
when resources become limited populations grow logistically
When resources become limited, populations grow logistically
  • Population growth stops at the carrying capacity
exit slip no notes
Exit slip – no notes!
  • What are three factors that limit population growth?