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Feeding Relationships
• A food chain shows a simple feeding relationship.
Sun →
• All food chains start with the sun
Feeding Relationships
• A food chain shows a simple feeding relationship.
Sun → grass →
Feeding Relationships
• A food chain shows a simple feeding relationship.
Sun → grass → rabbit →
Feeding Relationships
• A food chain shows a simple feeding relationship.
Sun → grass → rabbit → fox
All food chains start with ENERGY from the sun
carbon dioxide from the air
energy from sunlight (or light)
water fromthe roots
foodtransported to therest of the plant
carbon dioxide from the air
energy from sunlight (or light)
water fromthe roots
foodtransported to therest of the plant
Photosynthesis
Because plants produce their own food, they are called ‘Producers’
The energy is then passed on to animals when they eat the plant.
Animals of all shapes…
…and sizes!
Because these animalsare the first to takethe food energyfrom the plants,
They are called primary consumers
Some of these primary consumers have predators. Other animals that feed on them
Aphids are eaten by….
Ladybirds
Animals that eat primary consumers are called secondary consumers
• So far this is a straightforward food chain
• Sun → aphid → ladybird
But in reality it is more complicated than that
This bird eats ladybirds and
aphids
This bird eats smaller birds, mice, and
rabbits
Mice and rabbits have other predators
What will eat the frog?
What do you think the frog
eats?
Sometimes it’s not entirely clear who
eats who!
We can show what goes on with the help of a Food Web
What would happen if a disease killed off many of the hawks?
There will be nothing to eat the snakes, so their numbers will
increase.
All the frogs get eaten
No frogs.
More crickets
Most of the cattail gets eaten by the
crickets
Now the crickets don’t have enough
food so their numbers go down
..and so on. Numbers of each species have an effect on the numbers of the other species in the web.
• 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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