What is Life? A Guide to Biology with Physiology
What is Life? A Guide to Biology with Physiology
3rd Edition
ISBN: 9781464157745
Author: Jay Phelan
Publisher: W. H. Freeman
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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.
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