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New Unit= Predator/Prey

  • Animals that eat others for its livelihood
  • Examples: Wolf eats deer and elk

Cougar eats deer, Foxes eats Pheasants

Coyote eats rabbit

Bobcat and Snowshoe

Wolf and deer

Eagles and Fish

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Predator - Prey Interactions

  • On Isle Royale, an island in Lake Superior, the populations of wolves (the predator) and moose (the prey) rise and fall in cycles. Use the graph to answer the questions.

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Predator - Prey Interactions

    • Year; numbers of wolves and moose
  • Reading Graphs:

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    • What variable is plotted on the x-axis? What two variables are plotted on the y-axis?

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Predator - Prey Interactions

    • The moose population increased and then decreased; the wolf population increased.
  • Interpreting Data:

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    • How did the moose population change between 1965 and 1972? What happened to the wolf population from 1973 through 1976?

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Predator - Prey Interactions

    • As the moose population increased, more food was available to the wolf population and it increased.
  • Inferring:

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    • How might the change in the moose population have led to the change in the wolf population?

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Predator - Prey Interactions

    • The wolf population increased.
  • Drawing Conclusions:
    • What is one likely cause of the dip in the moose population between 1974 and 1981?

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Predator - Prey Interactions

    • Disease would cause a decrease in the wolf population, so fewer moose would be eaten and the population

could increase.

  • Predicting:
    • How might a disease in the wolf population one year affect the moose population the next year?

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Ecology

  • Ecology-interaction of organisms with one another and their surroundings.

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Ecology

  • Ecosystem-Consists of a given area’s physical features and living organisms
  • Ex. Lakes, mountains, house, valley, etc

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Ecology

  • Population fluctuation-The up and down in #’s of living organism in an ecosystem.
  • When #’s are down the population goes up, when #’s are up they fall
  • Ex. Predator/Prey cycle

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Carry Capacity

  • The # of organism in a area can’t get any bigger, because of lack of food/resources.
  • Ex. Yellowstone animals, stable population

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Ecology

  • Balancing Feed back loop-balanced ecosystems
  • Reinforcing Feed Back loop-a disturbance which cause a change in 1 direction that keeps it going in that direction
  • Ex. Human caused effects

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Human caused effects�

  • Pollution of water, air, ground etc.
  • Removing habitat, clearing forest, farms, marshes, grassland and hillsides
  • Killing top predators to extinction
  • Spraying pesticides(chemicals)
  • Using all of the natural resources and not recycling
  • Urban Sprawl

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Acid Rain Mining wastes

Pesticide Problems

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Extinction-no species alive

Sinonyx

Marmoset Monkey�