Feeding Relationships

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Feeding Relationships

• A food chain shows a simple feeding relationship.
• Sun ?
• All food chains start with the sun

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Feeding Relationships

• A food chain shows a simple feeding relationship.
• Sun ? grass ?

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Feeding Relationships

• A food chain shows a simple feeding relationship.
• Sun ? grass ? rabbit ?

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Feeding Relationships

• A food chain shows a simple feeding relationship.
• Sun ? grass ? rabbit ? fox

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All food chains start with ENERGY from the sun
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carbon dioxide from the air
energy from sunlight (or light)
water from the roots
food transported to the rest of the plant
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Photosynthesis
carbon dioxide from the air
energy from sunlight (or light)
water from the roots
food transported to the rest of the plant
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Because plants produce their own food, they are
called Producers
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• The energy is then passed on to animals when they
  eat the plant.

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• Animals of all shapes

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and sizes!
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Because these animalsare the first to takethe
food energyfrom the plants,
They are called primary consumers
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Some of these primary consumers have predators.
Other animals that feed on them
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Aphids are eaten by.
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Ladybirds
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Animals that eat primary consumers are called
secondary consumers
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• So far this is a straightforward food chain
• Sun ? aphid ? ladybird
• But in reality it is more complicated than that

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This bird eats ladybirds and aphids
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This bird eats smaller birds, mice, and rabbits
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Mice and rabbits have other predators
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What will eat the frog?
What do you think the frog eats?
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Sometimes its not entirely clear who eats who!
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We can show what goes on with the help of a Food
Web
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What would happen if a disease killed off many of
the hawks?
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There will be nothing to eat the snakes, so their
numbers will increase.
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All the frogs get eaten
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No frogs.
More crickets
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Most of the cattail gets eaten by the crickets
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Now the crickets dont have enough food so their
numbers go down
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..and so on. Numbers of each species have an
effect on the numbers of the other species in the
web.
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• Use the food web worksheet to predict what might
  happen in the following situations
• A) There is very little rain and much of the
  Marsh Grass and Cattail die off.
• B) Humans nearby bring cats into the area.
• C) The frogs eats some poisoned slugs from a
  garden

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