EBK LIFE: THE SCIENCE OF BIOLOGY
EBK LIFE: THE SCIENCE OF BIOLOGY
11th Edition
ISBN: 8220103935432
Author: Sadava
Publisher: MAC HIGHER
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Chapter 57.3, Problem 2R
Summary Introduction

To review:

The lakes, in which one has three trophic levels and the other has four trophic levels, also to understand which one has the higher net production rate with reason, and the effect of omnivore on the net primary production (NPP), when added to the top of the food web with four trophic levels.

Introduction:

The trophic levels in the food web describe the position of the organism with respect to the energy gained by the organism. For example, the herbivores obtain one-tenth of the energy assimilated by the plants and the carnivores obtain one-tenth of the energy assimilated by the herbivores. Hence, the plants are considered as primary producers, and they occupy first trophic level. The herbivores mainly occupy the second trophic level and the lions occupy the third trophic level. The NPP is measured in terms of the carbon available by plants after respiration.

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A Food Web om Eage Pythan Wolf Rat Dragonfly Thrush Frog Butterfly Fruit Fly Grasshopper Mangoes Corn A Flowering Plant Lavenders Look at the food web above to answer the following questions. 1. Which organisms are the producers in this food web? 2. Which organism is an example of a primary consumer? 3. Which organism is an example of a tertiary consumer?
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EcosystemA hasprimary production of 1000 g C /m2/yr and ecological efficiency of 10%. Ecosystem B has primary production of 300 g C /m2/yr and an ecological efficiency of 25%. a.Which ecosystem will have more production at thesecondary consumer (carnivore) trophic level? b.Which ecosystem is more likely to support an endothermic primary consumer (herbivore)? c.If atrophic level requires at least 1 gC/m2/yr in order to exist, how many trophic levels can each of these ecosystems support?d.Given your answer to part c, which do you thinkhas a larger impact on the energy available at upper trophic levels: primary productivity or efficiency of energy movement across trophic levels?
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