Food Chains and Food Webs - PowerPoint PPT Presentation

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Food Chains and Food Webs

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  1. Food Chains and Food Webs What's for dinner?"

  2. Food Chains • A food chain is the sequence of who eats what in a ecosystem.

  3. Food Chains • A food chain starts with an energy source. • The sun • Deep sea vents • In our woods, what was the primary energy source? • CD

  4. Food Chains • The 1rst link in the chain is an organism that makes its own food from the energy source. • Usually photosynthesis • These are called Primary Producers • Or Autotrophs.

  5. Food Chains • In our woods, what are the Autotrophs? • CD • How ‘bout the pond, what are the Primary Producers? • CD

  6. Food Chains • Next come organisms called primary consumers. • These are the organisms thateat the autotrophs. • Organisms that eat plants are called herbivores. • An example is a bunny that eats grass

  7. Food Chains • Next link in the chain are the animals that eat herbivores. • These are called secondary consumers. • an example is a snake that eat bunnies.

  8. Food Chains • These animals (the secondary consumers) are eaten by larger predators called tertiary consumers. • For example, owls eat snakes...

  9. Check out these food chains.

  10. Food Chains • Primary producers are autotrophs. • Primary consumers are herbivores (plant-eaters). • Eat secondary consumers. • Secondary consumers are carnivores (meat-eaters) or omnivores(animals that eat both animals and plants). • Eat secondary consumers. • Tertiary consumersare carnivores or omnivores • Eat secondary consumers. • Quaternary consumers are carnivores or omnivores • Eat tertiary consumers.

  11. Food Chains • The arrows in a food chain show the flow of energy, from the source to a top predator. As the energy flows from organism to organism, energy is lost at each step.

  12. Food Chains • A network of many food chains is called a food web.

  13. More Players in a Food Web • When any organism dies, • It is eaten by detrivores • (worms, maggots,crabs) • It is broken down by decomposers • (bacteria, fungi)

  14. Food Webs

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  17. Food Webs