Ecosystems For Grades 4-6
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Transcript of Ecosystems For Grades 4-6
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EcosystemsWhat is an ecosystem?
An ecosystem is a place where animals, plants, and non-living materials exist
together.A Joe Fasen Enhanced Power Point Presentation
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EcosystemsIf you could choose an
ecosystem in which to live which one would you
choose? Why?Let’s take a look at some ecosystems to help you
decide….
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Mountain
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Tundra
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Temperate Forest
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Marine/Island
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Desert
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Tropical Dry Forest
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Cold Climate Forest
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Grassland
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Savannah
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Tropical Rainforest
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EcosystemsWhat interactions take place in an ecosystem?
What goes on in an ecosystem?
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Predation• When one organism hunts and eats
another.• The fox is the predator and the
rabbit is the prey.
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Scavengers
• Animals that feed on decaying or dead plants or animals.
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Producers• Green plants that use energy from
the sun to produce food through process of photosynthesis.
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Consumers
• Organisms that do not make their own food but eat other organisms.
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Carnivores
• Animals that eat only MEAT.
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Herbivores
• Animals that only eat PLANTS.
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Omnivores• Eat both plants and meat
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Decomposers
• Consume wastes and dead organisms.– Examples: fungi, bacteria, earthworms
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Symbiosis• Specific interaction between two
species over a long period of time “living together”
Both speciesbenefit
One species benefits,the other is neither helped nor harmed.
One species benefits,the other is harmed
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Succession
• The gradual change of one community to another over time.
• Succession happens in all communities.
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• Sometimes forests go through long periods of time without rain. A fire could start during one of these dry spells. What would happen then? (succession)
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• In the forest fire, many trees and animals will die. –Many animals will move away from the
forest to a new location.
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• After the forest fire, the community will begin to rebuild:– Plants begin to grow– Animals come back to feed on the new
plants.
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• Eventually, new trees will grow.– Small trees will grow at first, but after
many years, larger trees such as spruce and fir may grow.
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• So, here is our example of succession:
Forest fireoccurs
Trees & animals dieor relocate
Plants begin to grow;animals return to feedon new plant growth
Small treesbegin to grow
Large trees grow;
completing the forest