8.11A: Rela:ons in a Food Web Organisms and Environments Part I: The Chain vs. the Web Fundamental Ques:on: How does energy flow in a food chain and a food web? Draw one example food chain using your food web. Use arrows to show energy flow. Recreate your food web by drawing it in the space below. Include the name of each organism, and use arrows to show energy flow. 1 8.11A: Rela:ons in a Food Web Organisms and Environments Part II: Producers, Consumers, Decomposers, Oh My! Fundamental Ques:on: How does energy flow in a food chain and food web? IdenAfy the role each organism in your food web plays and define the terms. Producers Consumers (Autotrophs) (Heterotrophs) Herbivores Carnivores Omnivores Decomposers 1.  Define what a producer (autotroph) is. _____________________________________ 2.  Define what a consumer (heterotroph) is. ___________________________________ A. Define what a herbivore is. ___________________________________ B. Define what a carnivore is. ___________________________________ C. Define what an omnivore is. __________________________________ 3.  Define what a decomposer is. __________________________________________ 2 8.11A: Rela:ons in a Food Web Organisms and Environments Part III: Energy Pyramid LEAST amount of ENERGY E N E R G Y F L O W Fundamental Ques:on: How does energy flow in a food chain and food web? List each organism in your food web into the correct trophic level. KEY H = Heterotroph A = Autotroph H Ter:ary Consumers
(Carnivores) H Secondary Consumers (Carnivores or Omnivores) H Primary Consumers (Herbivores) A Primary Producers MOST amount of ENERGY 1.  What provides the energy for all the life forms on Earth? ______________________________________________________________
______________________________________________________________ 3 8.11A: Rela:ons in a Food Web Organisms and Environments Part IV: So Many Rela:onships! Fundamental Ques:on: Can you describe the predator/prey rela:onships and parasite/host rela:onships within a food web? Complete the table below by idenAfying three predator-­‐prey relaAonships within your food web. Predator Prey 1. 2. 3. Complete the table below by idenAfying one of each type of relaAonship within your food web.
Commensalism One organism benefits, and the other organism is NOT harmed. Mutualism BOTH organisms benefit. Parasi:sm One organism (parasite) benefits, and the other organism (host) is harmed. Name two organisms that share this type of relaAonship: How does one organism benefit from the relaAonship? Name two organisms that share this type of relaAonship: How do both organisms benefit from the relaAonship? Name two organisms that share this type of relaAonship: How does the parasite benefit and the host harmed? 4 8.11A: Rela:ons in a Food Web Organisms and Environments Part V: Food Web Gallery Walk Fundamental Ques:on: How does energy low in a food chain and food web? Observe each group’s food web (including you own) to complete each table. 2.  Which organism(s) has the most amount of energy? FRESHWATER FOOD WEB 1.  If plants are not receiving sufficient sunlight to photosynthesize their own food, what would happen to the food web if all the water plants, duckweed, algae, and ca[ails/weeds died out? 3.  If the frog populaAon increases, what will happen to the food web as a result? 2.  IdenAfy a decomposer in the food web. TEMPERATE DECIDUOUS FOREST FOOD WEB 1.  What would happen in the food web if the owls started to decrease in numbers? 3.  Which organisms are at the top of the food chain? 5 8.11A: Rela:ons in a Food Web Organisms and Environments Part V: Food Web Gallery Walk, con:nued DESERT FOOD WEB 2.  IdenAfy the autotrophs within the food web. 1.  Describe one predator-­‐prey relaAonship you see in the desert food web. 3.  What would result if the mountain lion populaAon started to increase? 2.  Which organisms have the most amount of energy in the food web? RAINFOREST FOOD WEB 1.  Which organisms are herbivores? 3.  Describe what would happen within the food web if all of the insects died. 6 8.11A: Rela:ons in a Food Web Organisms and Environments Part V: Food Web Gallery Walk, con:nued 2.  Where does the energy that powers the food web come from? SAVANNA FOOD WEB 1.  Describe what would occur in the food web if the zebra populaAon started to decrease. 3.  IdenAfy a parasite-­‐host relaAonship within the food web. 2.  Describe a mutualisAc relaAonship found within the food web. MARINE FOOD WEB 1.  Describe a commensalisAc relaAonship found within the food web. 4. IdenAfy one carnivore in the food web. 7 3.  Describe a parasite-­‐host relaAonship within the food web. 8.11A: Rela:ons in a Food Web Organisms and Environments Reflec:ons and Conclusions 1.  Compare and contrast food chains and food webs in the Venn diagram: Food Webs Food Chains 2.  Describe each organism within a food web. Producers: _______________________________________________________ Consumer: _______________________________________________________ Three types of consumers: _____________________________________________ Decomposer: _____________________________________________________ 3.  Describe what a predator is and what a prey is and how they are related. _____________________________________________________________
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_____________________________________________________________ 4.  Describe what a parasite is and what a host is and how they are related. _____________________________________________________________
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_____________________________________________________________ 5.  In what ways are the predator-­‐prey and parasite-­‐host relaAonships similar? _____________________________________________________________
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