Energy Transfer and Food Webs

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Presentation transcript:

Energy Transfer and Food Webs

Energy Flow Through an Ecosystem

Food Chains A single pathway of feeding relationships among organisms in an ecosystem

Trophic Levels

Energy Transfer and 10% Law 10% of energy consumed in one trophic level is transferred to the next trophic level

Energy Transfer

Energy Transfer ? ? ? ?

Energy Transfer Which trophic level has the MOST energy? LEAST energy? Which trophic level has the MOST organisms? LEAST organisms?

Energy Transfer Why is the percentage of energy transfer so low? Why do food chains usually not exceed four trophic levels?

What is a food web? Interconnected food chains Show feeding relationships among many organisms in an ecosystem Arrows in direction of energy transfer

Food Webs Do food webs generally contain all the organisms in an ecosystem?

Let’s give it a try… Interactive Food Webs

Your task today… Working with your lab group, Create a food web with your list of organisms from a desert ecosystem Follow the format given to you Write it on paper before you transfer it to poster Keep it neat and easy to read!

Food Web Homework What is a cedar glade?

Eastern prickly pear Pyne’s Ground Plum Tennessee coneflower

Food Web Homework You have been given a list of cedar glade organisms Create a food web of the cedar glade ecosystem Remember to follow the format given in class Keep it neat and easy to follow!