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Food Chains. Food chains show which organisms eat other organisms Grass Rabbit Fox The arrows show the transfer of energy from one organism to the next. . Producers - organisms which can make their own energy from carbon dioxide and water using sunlight for energy (plants)

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food chains
Food Chains
  • Food chains show which organisms eat other organisms

Grass Rabbit Fox

  • The arrows show the transfer of energy from one organism to the next.
slide2
Producers - organisms which can make their own energy from carbon dioxide and water using sunlight for energy (plants)
  • Primaryconsumer - organisms which eat producers (herbivores)
  • Secondaryconsumers - organisms which eat primary consumers (carnivores)
  • Tertiaryconsumers - organisms which eat secondary consumers (carnivores)
slide3
Each level of a food chain is known as a trophic level
  • Food chains always start with a producer. Producers are always on the first trophic level.
food chains1
FoodChains

Each level of a food chain is known as a trophic level

Barn owl

Tertiary consumer

Fourth trophic level

Wood mouse

Third trophic level

Secondary consumer

Bark beetle

Second trophic level

Primary consumer

Oak Tree

First trophic level

Producer

slide5
Food Web

1. Write down two food chains from this food web.

slide7
Questions

1. What will happen to the number of clown fish if the sharks become vegetarian?

2. What effect will this have on the number of zooplankton?

3. What will happen to the Blue Regal fish if a disease wipes out the small invertebrates.

pyramids of number
Pyramids of Number
  • Food chains and food webs show the feeding relationships in a community. But they do not tell us howmany living organisms are involved.
  • It takes many plants to feed a herbivore, and many herbivores to feed one carnivore.
slide9
On the coral reef, there are 25 great white sharks.

These 25 sharks feed on 1,100 clown fish.

The clown fish feed on 15,000 algae.

Can you draw a pyramid of numbers to show this food chain? Use a scale of 1 mm for each 100 organisms to draw the pyramid to scale.

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