3rd Grade Part Six

1
3rd Grade Part Six

• Review

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Interactions in Ecosystems

• Ecosystems include populations, communities, and
  habitats, as well as, nonliving things like air,
  water, and soil.
• Plants and animals depend on one another to help
  them meet their needs.
• Interactions includes food chains, food webs,
  predator-prey relationships, and living and
  nonliving

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How can ecosystems be changed?

• Natural events such as floods, fire, earthquakes,
  etc.
• Humans
• Animals

http//www.uoregon.edu/donovan/favorite.htm
http//jazba.wordpress.com/2008/09/08/country-to-h
it-another-earthquake-geophysicists/
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Ecosystems

• Forests
• an area with mostly trees
• receive different amounts of rainfall, sunshine,
  and specific temperatures

• Deserts
• an area with very little rainfall
• some are hot and others cold

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Ecosystems
Freshwater Mostly found in rivers, streams, and
lakes
Saltwater Found in oceans, seas, and some lakes
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Food Chains
Producer
Consumer
Consumer
Consumer

• The path of energy from one living thing to
  another forms a food chain.
• Energy from the sun is used to produce sugar in
  plants which is then passed on to animals.
• Animals must consume their food from other
  organisms.

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Food Chains
Producer
Consumer
Consumer
Consumer
Prey
Predator
Predator
Prey

• Animals that hunt other animals for food are
  predators.
• Animals that are hunted are prey.

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Decomposers

• Decomposers are living things that break down
  dead things for food.
• They help clean the environment as they break
  down the wastes of other living things.

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Learned Behaviors

• Behaviors animals are taught after birth

http//www.disciplemexico.org/2006/10/like-riding-
bicycle.html
http//www.wunderground.com/blog/MikeTheiss/commen
t.html?entrynum80
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Food Web

• Most ecosystems have many food chains that
  overlap and link together.
• When a population increases or decreases, it can
  affect other populations in the food web.

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Energy Pyramid

• Shows the amount of energy available to pass from
  one level of the food chain to the next.
• The higher the animal is in the pyramid, the
  fewer there are.