Unit 8 - Energy and Nutrient Flow through Ecosystems

In the last unit we began a study how energy cycles between autotrophic organisms and heterotrophic organisms through the processes of photosynthesis and respiration. In this unit we extend our study of energy flow and look at energy flow through an entire ecosystem by way of food chains. In the process we will come to understand how major nutrients (C, O, H, N, and P) flow and recycle through and ecosystem as well.

SB4b: Explain the flow of matter and energy through ecosystems by

• Arranging components of a food chain according to energy flow.Comparing the quantity of energy in the steps of an energy pyramid.
• Explaining the need for cycling of major nutrients (C, O, H, N, P)

Assignment 1: Food Chains -- mini-lecture. Take notes and fill-in the definitions of the terms listed in the Energy Flow and Nutrient Cycling worksheet as we go. (Click here to view worksheet)
Click here to view power point version of the mini-lecture.

Assignment 2: Food Chain Poster (project). Obtain a copy of the directions and grading rubric from your instructor. Complete the poster on a half sheet of poster board as per the instructions. Attach the grading rubric to your poster when you turn it in for grading.

Assignment 3: Energy Pyramids -- mini-lecture. Take notes and participate in class discussion.
Click here to view power point version of the mini-lecture.

Assignment 4: Nutrient Cycling -- mini lecture. Draw a simple diagram of each nutrient cycle in the space provided in the Energy and Nutrient Flow helpsheet.
To review...
The water cycle, click here.
the carbon cycle, click here.
the nitrogen cycle, click here.
the phosphorous cycle, click here.

Assignment 5: Watch the video movie "Happy Feet." Take note of any illustrations of food chains and energy and nutrient flow through the Antarctic ecosystem portrayed in the movie.

Unit Quiz: Energy and Nutrient Flow through ecosystems. (paper test)