Ch 14: Holt McDougal Biology Chapter 14: Interactions in Ecosystems

About This Chapter

The Interactions in Ecosystems chapter of this Holt McDougal Biology Companion Course helps students learn the essential lessons associated with interactions in ecosystems. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Interactions in Ecosystems textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal Interactions in Ecosystems chapter with which you need help.
  • Find the corresponding video lessons with this companion course chapter.
  • Watch fun videos that cover the interactions in ecosystems topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • Habitats and ecological niches
  • Types of community ecology
  • Population density and survivorship
  • Migration and dispersion
  • Ecological factors limiting population growth
  • Ecological succession

Holt McDougal is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with

6 Lessons in Chapter 14: Holt McDougal Biology Chapter 14: Interactions in Ecosystems
Test your knowledge with a 30-question chapter practice test
Ecosystems, Habitats and Ecological Niches

1. Ecosystems, Habitats and Ecological Niches

Check out this video lesson to understand the many complex aspects of an ecosystem. See how animals live in habitats and survive amongst their surroundings.

Community Ecology: Definition & Types

2. Community Ecology: Definition & Types

Community ecology looks at the interactions between populations of organisms. Here we explore a polar ecosystem in Greenland to describe what community ecology entails and what it really means to be at the top of the food chain.

Populations: Density, Survivorship and Life Histories

3. Populations: Density, Survivorship and Life Histories

Have you ever wondered how biologists determine the populations of animals in a particular geographic area? Watch this video lesson to find out, and discover how scientists look at the survivorship and life histories of many different species.

Carrying Capacity, Migration & Dispersion

4. Carrying Capacity, Migration & Dispersion

Have you ever wondered why some types of birds fly south in the winter or why some animals form territories? Watch this video to learn about a species' maximum growth capabilities, the way its members group themselves and why they might migrate to new locations every year.

How Ecological Factors Limit Population Growth

5. How Ecological Factors Limit Population Growth

In this lesson, we are going to discover why populations do not continue to grow at unlimited rates, and what ecological factors limit population growth. We'll also discover how humans factor into population limits.

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

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Other Chapters

Other chapters within the Holt McDougal Biology: Online Textbook Help course