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# Trophic Level Energy Transfer Calculations

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## Kara Bates

on 16 January 2013

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#### Transcript of Trophic Level Energy Transfer Calculations

Okay, if no transfer of energy is 100% complete, where does it go? Good Luck! Trophic Levels Trophic Level Energy Transfer Calculations The Problem: To understand the concept of energy transfer, we must first understand the 1st and 2nd Laws of Thermodynamics: Ultimate source of energy... THE
SUN 1st Law: Energy can neither be created nor destroyed. 2nd Law: No transfer of energy is 100% complete. Energy can be incorporated in tissues of plants/animals (this energy will be available for the next trophic transfer) Energy of metabolism (energy required for any activity used to keep the plant/animal alive) Energy that remains in waste/at death (will be used/consumed by bacteria and fungi, the major decomposers) In natural ecosystems, the energy that leaves the system is mostly in the form of HEAT, generated in part by the respiration of the organisms at the various trophic levels and in part by decomposition. When light energy strikes the earth...
it is reflected back into space,
it is transmitted through an object, or
it can be absorbed

Which one are we going to focus on the most? Trophic Levels *
1-Producers
2-Primary consumers
3-Secondary consumers
4-Tertiary consumers
5-Quaternary consumers H

L The amount of light energy that is captured per square meter per year is dependent on a specific latitude and longitude. This is expressed in KCal/m2.

Describe the difference in the amount of light energy captured in a tropical region vs. a polar region. 10% Rule
What does it mean, exactly?
Let's try an example It is assumed that only 10% of the original energy will be completely transferred to the next trophic level. If we begin with 1000 KCal of energy incorporated into plant tissue via photosynthesis, how much energy would be available to the primary consumer, secondary consumer, tertiary consumer, and quaternary consumer? You are going to calculate
trophic level energy transfers to determine the following: How much energy is used in metabolism, How much energy is converted by decomposers, and How accurate the 10% rule is. Yes, you will need a calculator!
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