Interactions Among Living Things

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Interactions Among Living Things
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I. Living Things and Their Environment

• All of the living (biotic) and nonliving
  (abiotic) things in an environment are
  interconnected.

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• Example Think of a spider web. The
  environments web is the relationship among its
  plants, animals, soil, water, temperature, light,
  and other biotic and abiotic factors.

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Temperature
Light
Animals
Soil
Water
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• What happens when one part of a spiders web is
  damaged?

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The entire web falls apart.
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What happens when someone contaminates the water
supply to a farm?
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A. Ecosystems

• Consists of all the living (biotic) and nonliving
  (abiotic) things in a given area that interact
  with one another.

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Abiotic factors nonliving
Sunlight
Air
Rocks
Soil
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Biotic Factors Living
Fish
Flamingo
Mushroom
Flower
Man
Tree
Bacteria
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• Ecosystems overlap and affect one another.
• Ecosystems can be as tiny as a drop of pond water
  or as large as an ocean.

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Forest Ecosystem Includes birds, squirrels,
rabbits, trees, bushes, grass, insects,
mushrooms, bacteria, dead leaves, soil, rocks,
sunlight, rainwater, etc.
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Desert Ecosystem Air, sunlight, cacti, sand,
pocket mice, jack rabbits, etc
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B. Communities

• The living part of any ecosystem.
• All the different organisms that live together in
  that area.
• Example Pond community Includes fish, frogs,
  snails, microorganisms, and water lilies.

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Pond Community
Cattails
Kingfisher
Otter
Water strider
Frog
Catfish
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C. Populations

• A group of organisms of the same type (species)
  living together in a community.
• Example all the rainbow trout in a lake or all
  the redwood trees in a forest.

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Rainbow Trout
Redwood Trees
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What type of ecosystem do you live in?

• Take a sheet of paper, divide it in half, and
  make a list of the biotic and abiotic factors in
  your ecosystem.

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Biotic
Abiotic