Model Ecosystems

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Lab 4 Worksheet: Model Ecosystems

Student instructions: Follow the step-by-step instructions for this exercise found on the worksheet below and in the virtual lab and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus.

Please make sure that your answers are typed in RED.

Please type your Name and Student ID Number here:

Directions

1.Open the Virtual Lab titled “Model Ecosystems”.

2.Please make sure you have read through all of the information in the “Question” and “Field Guide” areas.

3.In this exercise, you will examine several model ecosystems and their characteristic plant and animal species. To begin, read the information in the “Field Guide” to learn more about the organization of five selected ecosystems.

4.If you come upon terms that are unfamiliar to you, please refer to your textbook for further explanation or search the word here: http://encarta.msn.com/encnet/features/dictionary/dictionaryhome.aspx

5.You are now ready to begin the activity. Start by selecting the ecosystem type that you would like to model from the pull down menu at the top of the screen.

6.Click and drag the various organisms to their correct locations within the different trophic levels of the pyramid. Once you have moved all of the organisms click the “Check” button and fix any incorrect choices if necessary.

7.List each of the organisms (by name) at each trophic level under the “Organisms Present:” area on Table 1.

8.Clicking on the “Pyramid of Numbers” will show the number of organisms at each trophic level within this type of ecosystem. Fill in this information from the pyramid on Table I below under the “Numbers:” area.

9.Clicking on the “Pyramid of Energy” will reveal how much energy is available at each trophic level. Fill in this information from the pyramid on Table 1 below under the “Energy:” area.

10.You must take one last step in the investigation of this ecosystem. It is important to determine the amount of energy that is transferred from one trophic level to the next. This is called the “Energy Conversion Efficiency” (E.C.E.), and this ratio is determined by taking the energy value from the trophic level you are calculating the E.C.E. for and dividing it by the energy value of the level below it. Please do these calculations as directed below and input the data in Table I below.

11.When you are completely finished analyzing the ecosystem, you can click the “Reset” button and select another type of ecosystem from the pull down menu. Follow the directions above to investigate this ecosystem and the three that remain.

12.Answer Lab Questions 1-17 below.

Table 1

To complete the Table below, students should complete the following 4 steps.

1.List the organisms present in each ecosystem (i.e. hawks, snakes, etc.) under “Organisms Present:”.

2.List the total number of organisms present at each trophic level in each Ecosystem under “Numbers:”.

3.List the total energy at each trophic level in each ecosystem under “Energy:”.

4.Calculate and list the E.C.E. The E.C.E. can be calculated by taking the energy value from the trophic level you are calculating the E.C.E. for and dividing it by the energy value of the level below it.

Example: First Order Heterotrophs / Producers = ECE for First Order Heterotrophs

*Round all E.C.E. values to the 3nd (thousandths) decimal place.

Ecosystem TypeProducersFirst Order HeterotrophsSecond Order HeterotrophsThird Order Heterotrophs Deciduous ForestOrganisms present:

Numbers:
Energy:
E.C.E.: Organisms present:

Numbers:
Energy:
E.C.E.: Organisms present:

Numbers:
Energy:
E.C.E.: Organisms present:

Numbers:
Energy:
E.C.E.:
Hot DesertOrganisms present:

Numbers:
Energy:
E.C.E.: Organisms present:

Numbers:
Energy:
E.C.E.: Organisms present:...
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