Biology: Life on Earth (11th Edition)
11th Edition
ISBN: 9780134168296
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Textbook Question
Chapter 29, Problem 3RQ
Define net primary production. Would you predict higher productivity in a farm pond or an alpine lake? Explain your answer.
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Using the graphs above and what you know about statistics and ecology, do these
data more likely demonstrate a system that is N-limited or P-limited? (If a certain
nutrient is limiting, it has a significant impact on productivity when added to the
system.) Justify your answer. Please keep your answers to no more than 3
sentences.
A/
Define Net Primary Productivity. To get this right, you must mention GPP in your answer (In a way that is useful).
Define productivity as the word is used in ecology. What is a pri-mary producer? What is the distinction between gross productivity, net productivity, and respiration? How is net productivity related to biomass (or standing crop)?
Chapter 29 Solutions
Biology: Life on Earth (11th Edition)
Ch. 29 -
1. Which trophic level(s) must be present to...Ch. 29 - Prob. 2MCCh. 29 - Denitrifying bacteria convert ammonia to nitrate...Ch. 29 -
4. Net primary production per unit area is likely...Ch. 29 - The effect of CO2 emissions from burning fossil...Ch. 29 -
1. Nearly all life gets its energy from _______...Ch. 29 -
2. Photosynthetic organisms are called either...Ch. 29 -
3. Feeding levels within ecosystems are also...Ch. 29 - In general, only about ______ percent of the...Ch. 29 - Prob. 5FTB
Ch. 29 -
6. During the nitrogen cycle, nitrogen gas is...Ch. 29 - Prob. 7FTBCh. 29 - Prob. 1RQCh. 29 -
2. What is a producer? What trophic level does it...Ch. 29 - 3. Define net primary production. Would you...Ch. 29 - Name the first three trophic levels. Among the...Ch. 29 - How do food chains and food webs differ? Which is...Ch. 29 - Define detritivore and decomposer and explain...Ch. 29 -
7. Trace the movement of carbon from one of its...Ch. 29 - Prob. 8RQCh. 29 - Trace a pathway of a phosphorus molecule from a...Ch. 29 -
1. Humans are omnivores who can feed on several...Ch. 29 - Discuss the contribution of human population...
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- A group of researchers are assessing energy availability in a terrestrial ecosystem. The image shows the food web for this ecosystem. They set up three plots and assess the biomass of producers, primary consumers, and secondary consumers. Rabbits and grasshoppers feed on ground cover plants that grow on the forest floor. Plot 1 is composed of mature hardwood trees, and only 25% of the sunlight reaches the shrubs and grasses compared to plots 2 and 3, which have fewer trees and allow more sunlight to reach the forest floor. Based on the food web shown here, which of the following best describes how the reduction in sunlight to the forest floor would impact the number of primary consumers (squirrel, grasshopper, rabbit, and deer) in plot 1 compared to the other plots? A - Plot 1 will show an increase in deer only because they feed on trees. B - Plot 1 will show a decrease in squirrels and rabbits, while deer and grasshoppers will increase. C - Plot 1 will show a decrease in rabbits and…arrow_forwardIn what type of ecosystem would you find high productivity? Why or why not? Explain your answer.arrow_forwardCalculate the fraction of energy available after climbing up 3 trophic level(s). Express it as a decimal fraction and percent. Include the units in your answer, where appropriate. don't copy from other sourcesarrow_forward
- To generate biogas the required biomass resources must be on wet form, else biogas will not produce. How do you disagree or agree with this statement? Justify your answerarrow_forwardFigure 46.8 Why do you think the value for gross productivity of the primary producers is the same as the value for totall heat and respiration (20,810 kcal/ m2/yr)?arrow_forwardTumucumaque National Park ecosystem For each bullet point, describe how each primary producer helps the ecosystem and how the black spider Monkey Consumer helps the ecosystem. Please answer the following question below with at least 2-4 bullet points straight to the point for ONE presentation slide for the following ecosystem Tumucumaque National Park. Banana primary producer (ONE PRESENTATION SLIDE) Black Spider Monkey Consumer (ONE PRESENTATION SLIDE)arrow_forward
- This conceptual model to the right shows the flow of energy through a spring ecosystem in Silver Springs, Florida from Figure 46.8 in your textbook. 7a. Which value/number on this diagram represents gross primary productivity (GPP)? Express using the units kcal/m?/yr. Sunlight 1,700,000 kcalim?lyr Primary producers 13,187 20,810 7,618 4,250 Primary consumers 7b. Which value/number represents net primary productivity (NPP)? Express using the units kcal/m?/yr. 2,265 3,368 1,103 720 Secondary consumers 272 383 111 90 7c. What accounts for the difference in GPP and NPP? Tertiary consumers 16 21 5 Decomposers 7d. What is the efficiency of energy transfer between the primary producers and the primary consumers? Is this more or less efficient than the transfer between a 5,060 5,060 Total heat and respiration 20,810 secondary consumer and tertiary consumer? Explain. respiration + heat to decomposersarrow_forwardThe question is in the image below.arrow_forwardb) Describe the relationship between Gross Primary Productivity (GPP), Net Primary Productivity (NPP), and Respiration (R)- but do not use any of these terms! How would you describe it to someone who does not like all those technical words? Coarrow_forward
- This conceptual model to the right shows the flow of energy through a spring ecosystem in Silver Springs, Florida from Figure 46.8 in your textbook. 7a. Which value/number on this diagram represents gross primary productivity (GPP)? Express using the units kcal/m?/yr. Sunlight 1,700,000 kcal/m?lyr Primary producers 13,187 20,810 7,618 4,250 Primary consumers 7b. Which value/number represents net primary productivity (NPP)? Express using the units kcal/m²/yr. 2,265 3,368 1,103 720 Secondary consumers 272 383 111 90 7c. What accounts for the difference in GPP and NPP? Tertiary consumers 16 21 Decomposers 7d. What is the efficiency of energy transfer between the primary producers and the primary consumers? Is this more or less efficient than the transfer between a secondary consumer and tertiary consumer? Explain. 5,060 5,060 Total heat and respiration 20,810 respiration + heat to decomposersarrow_forwardWould you expect a desert annual (a drought escaper) to have high or low water use efficiency? Explain your answer.arrow_forwardAssume that the producer level in your trophic pyramid contains 12,000,000 kcal of energy. Write the number of kcal that would be available to the other two levels of the pyramid.arrow_forward
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