Energy and Food Webs

Part 1:

Part 2:

Here is a food web for Lake Michigan:…

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  • In the Lake Michigan food web, is it possible to identify the most important producer? Why or why not?
  • What would happen if there was a change in the population size for any one of the producers (either an increase or a decrease)? How could these changes impact other producers and organisms on other trophic levels?
  • Provide at least two types of impacts that humans could have on this food web.
  • Read the description of the sea lamprey on page 2 of the food web. This species is described as non-native.
    • Propose a mechanism for how this fish was introduced to Lake Michigan.
    • What challenges could occur within a food web when a new predator like this is introduced into an ecosystem?
    • What natural population controls are missing for this species within this food web?
    • Do you think steps should be taken to eradicate this species from the food web? Explain why or why not? If so, what steps can be implemented?
  • Below are some resources that you may find helpful for the discussion this week. Enjoy!

    Great video that explains food webs:

    Great website and video on food webs:…

    Food chains and food webs:

    This must be 300-350 words

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