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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.

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Feeding Relationships

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Feeding relationships l.jpg

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!


Because these animals are the first to take the food energy from the plants l.jpg

Because these animalsare thefirst to takethe food energyfrom the plants,

They are called primaryconsumers


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Some of these primary consumers havepredators. Other animals that feed on them


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Aphids are eaten by….


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Ladybirds


Animals that eat primary consumers are called secondary consumers l.jpg

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 it’s 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 don’t 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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