Campbell Essential Biology with Physiology (6th Edition)
6th Edition
ISBN: 9780134711751
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 20, Problem 16PS
Interpreting Data In a classic study. John Teal measured energy flow in a salt marsh ecosystem. The table below shows some of his results.
| Form of energy | Kcal/m2/yr | Efficiency of energy transfer (%) |
| Sunlight | 600,000 | n/a |
| Chemical energy in producers | 6.585 | |
| Chemical energy in primary consumers | 81 | |
| Data from: J. M Teal, Energy Flow in the Salt Marsh Ecosystem of Georgia. Ecology 43: 614–24 (1962). | ||
- a. Calculate the efficiency of energy transfer by the producers. That is, what percentage of the energy in sunlight was converted into chemical energy and incorporated into plant biomass?
- b. Calculate the efficiency of energy transfer by the primary consumers. What percentage of the energy in plant biomass was incorporated into the bodies of the primary consumers? What became of the rest of the energy (see Figure 20.27)?
- c. How much energy is available for secondary consumers? Based on the efficiency of energy transfer by primary consumers, estimate how much energy will be available to tertiary consumers.
- d. Draw a pyramid of production for the producers, primary consumers, and secondary consumers for this ecosystem (see Figure 20.28].
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Chapter 20 Solutions
Campbell Essential Biology with Physiology (6th Edition)
Ch. 20 - Prob. 1SQCh. 20 - According to the concept of competitive exclusion,...Ch. 20 - Prob. 3SQCh. 20 - Prob. 4SQCh. 20 - Why are the top predators in food chains most...Ch. 20 - Over a period of many years, grass grows on a sand...Ch. 20 - Prob. 7SQCh. 20 - Local conditions, such as heavy rainfall or the...Ch. 20 - Prob. 9SQCh. 20 - Prob. 10SQ
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