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Ch 21: Introduction to Ecology

About This Chapter

The short lessons in this chapter make it easy for you to boost your knowledge of ecology. Review an introduction to this branch of biology to ensure your able to pass a test, complete a homework assignment or discuss ecology concepts in class.

Introduction to Ecology - Chapter Summary

This comprehensive introduction is designed to help you better understand the basics of ecology. Review the lessons anytime from your smartphone, tablet or computer to learn more about ecosystems, food chains, mutualism and other ecology concepts. With each lesson is a short quiz you can use to test your comprehension of the topics you review. Upon completion of this chapter, you will have a good grasp of the following:

  • What are ecosystems, ecology levels and the environment
  • What are tropic levels, food chains and an ecosystem's energy flow
  • How niche differentiation, competitive exclusion and interspecific competition work
  • Why mutualism, parasitism and other symbiotic relationships are important
  • What are metapopulations, habitat fragmentation and conservation biology
  • How ecological succession functions

6 Lessons in Chapter 21: Introduction to Ecology
Test your knowledge with a 30-question chapter practice test
The Environment, Levels of Ecology and Ecosystems

1. The Environment, Levels of Ecology and Ecosystems

Do you know the difference between an environment and an ecosystem? In this lesson, you'll find out what makes an environment, and what makes an ecosystem. You'll also learn what ecology is and some of the ways that scientists study ecology using organisms, populations, communities, ecosystems and even the entire biosphere.

Food Chains, Trophic Levels and Energy Flow in an Ecosystem

2. Food Chains, Trophic Levels and Energy Flow in an Ecosystem

In this lesson, you'll learn about food chains, food webs, and the different roles that organisms play in an ecosystem. You'll also learn about how energy flows through an ecosystem.

Interspecific Competition, Competitive Exclusion & Niche Differentiation

3. Interspecific Competition, Competitive Exclusion & Niche Differentiation

What happens when two similar species that consume the same resources occupy the same space? Interspecific competition, that's what! Watch our video lesson to learn about the outcomes of this ecological battle.

Symbiotic Relationships: Mutualism, Commensalism & Parasitism

4. Symbiotic Relationships: Mutualism, Commensalism & Parasitism

If your cat or dog has ever had fleas, you've witnessed symbiosis in action. In this lesson, learn the many types of symbiosis in biology, and how these relationships can have a positive, negative, or neutral effect on the individual species.

Conservation Biology, Habitat Fragmentation, and Metapopulations

5. Conservation Biology, Habitat Fragmentation, and Metapopulations

It's becoming harder to conserve large, unbroken tracts of wilderness. Is there another way for conservation biologists to ensure the survival of a species? In this lesson, you'll learn about habitat fragmentation and metapopulations.

Ecological Succession: From Pioneer to Climax Communities

6. Ecological Succession: From Pioneer to Climax Communities

Just as people grow and change so, too, do ecosystems. Watch this lesson to learn about ecological succession from the beginning stages of development to a community's ultimate destination, or climax.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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