What is Life? A Guide to Biology with Physiology
3rd Edition
ISBN: 9781464157745
Author: Jay Phelan
Publisher: W. H. Freeman
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Question
Chapter 15, Problem 7SA
Summary Introduction
To review:
The energy flow through an ecosystem and how it influences the number of top carnivores.
Introduction:
Energy flows from the producers (the plants), to herbivores, carnivores and top carnivores.
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Assume that humans are the second-level carnivores and that each energy unit in their level represents 25 people. How many people can be supported in the ecosystem?
The average efficiency of energy transfer between trophic levels is 10%. Use this efficiency to determine how much phytoplankton mass is required to add just 1 gram (0.04 ounce) of new mass to a killer whale, which is a third-level or top carnivore. Create a diagram that summarizes the different trophic levels and the relative size and abundance of organisms at each level. How would your answer change if the efficiency were half the average rate? Twice the average rate?
Give an account of energy flow in an ecosystem.
Chapter 15 Solutions
What is Life? A Guide to Biology with Physiology
Ch. 15 - Prob. 1SACh. 15 - Prob. 2SACh. 15 - Prob. 3SACh. 15 - Prob. 4SACh. 15 - Prob. 5SACh. 15 - Prob. 6SACh. 15 - Prob. 7SACh. 15 - Prob. 8SACh. 15 - Prob. 9SACh. 15 - Prob. 10SA
Ch. 15 - Prob. 11SACh. 15 - Prob. 12SACh. 15 - Prob. 13SACh. 15 - Prob. 14SACh. 15 - Prob. 15SACh. 15 - Prob. 1MCCh. 15 - Prob. 2MCCh. 15 - Prob. 3MCCh. 15 - Prob. 4MCCh. 15 - Prob. 5MCCh. 15 - Prob. 6MCCh. 15 - Prob. 7MCCh. 15 - Prob. 8MCCh. 15 - Prob. 9MCCh. 15 - Prob. 10MCCh. 15 - Prob. 11MCCh. 15 - Prob. 12MCCh. 15 - Prob. 13MCCh. 15 - Prob. 15MC
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- Q1: How is a decomposer different from a more typical consumer? Q2: What is the difference between how carbon is brought into the biotic portion of the ecosystem, and how other nutrients, such as phosphorus, are brought in? Q3: Describe all the points at which heat is lost in this figure.arrow_forwardDescribe the flow of energy through an ecosystem.arrow_forwardHow does energy movee through an ecosystem from one trophic level to the next and what is the consequences of human diet choices on ecosystem resources?arrow_forward
- What is a food web? How does the amount of primary productivity influence the number of trophic levels in a food web as well as the number of species at the top? Explain the difference between top down and bottom up control in food webs.arrow_forwardHow much energy is passed from one trophic level to the next? Explain why.arrow_forwardTrophic Cascade Concept Map Primary Producers: Include at least two different types of primary producers (plants, algae, or other autotrophs) in the ecosystem. Herbivores: Identify herbivores that feed on the primary producers you chose or invented. Include 2 different species that might consume your primary producers Primary and/or Secondary Carnivores Introduce at least 2 carnivores that prey on herbivores or other carnivores. Demonstrate a cascading effect on the ecosystem. Biotic Interactions-Highlight various biotic interactions, such as mutualism, competition, and especially predation, among different organisms in the community.arrow_forward
- Which of the following statements about nutrient challenges faced by organisms is FALSE? Carnivores are limited by the ratio of carbon to nitrogen found in prey. Detritivores consume food rich in carbon but poor in nitrogen. Plants can exhibit the same type of functional response curve describing the rate of energy intake as carnivores. The diet of a carnivore can vary geographically depending on the availability of prey.arrow_forwardIn the trophic structure, autotrophs are living organisms that: Are at the top of the chain, referred to as tertiary producers. Photosynthetic organisms that produce their own energy Organisms that receive their energy by consuming producers such as plants Help to decompose the remains of dead organismsarrow_forwardWhat is the significance of primary consumers (consumers that feed on autotrophs, like herbivores) to the community?arrow_forward
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