Copyright

Ch 45: ORELA General Science: Population Dynamics & Community Ecology

About This Chapter

Prepare to demonstrate your mastery of population dynamics and community ecology topics when you sit for the ORELA General Science examination. Use this chapter's video lessons to review what you learned previously.

ORELA General Science - Population Dynamics and Community Ecology - Chapter Summary

This chapter's information-rich video lessons can make you aware of the areas you need to brush up on so that you can perform better when taking the ORELA General Science examination. Explore conservation biology as well as the principles of ecology and the population density of various species in preparation for the test. Watch the online videos in order to:

  • Study the environment and different ecosystems
  • Explain inter-specific competition and species diversity
  • Explore the interactions between predator and prey, and understand symbiotic relationships
  • Discuss survivorship and population density
  • Define carrying capacity and habitat fragmentation
  • Learn more about dispersal mechanisms and the colonization of animals
  • Examine social behaviors and territoriality in animals

Recall the fundamentals of population dynamics and community ecology when you watch these video lessons. Brief as well as entertaining, they are led by experienced science professionals. Study the videos interactively when it's convenient for you. The lessons include video tags for finding and re-watching specific scenes, and written transcripts accompany the lessons. Use the self-assessment quizzes to determine how much you remember.

ORELA General Science - Population Dynamics and Community Ecology Objectives

The third section of the four-part ORELA General Science examination focuses on life science. This is where you'll find questions related to this chapter's topics. The portion adds up to 25% of the overall examination score. Display your scientific expertise and your qualifications for a general science teaching endorsement as you answer 150 multiple-choice questions. You will have three hours to complete the computer-based examination.

10 Lessons in Chapter 45: ORELA General Science: Population Dynamics & Community 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.

Interspecific Competition, Competitive Exclusion & Niche Differentiation

2. 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.

What is Species Diversity? - Definition, Importance & Examples

3. What is Species Diversity? - Definition, Importance & Examples

Have you ever wondered how many species live on Earth? Earth is full of amazing creatures. In this lesson, you will learn about the importance of species diversity. At the end, test your knowledge with a quiz.

Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

4. Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

You probably know that skunks can be quite stinky, bees sting and monarch butterflies are pretty, but do you know why? This lesson will introduce you to the reasons why some animals look or act the way they do and how these things relate to the predator/prey relationship.

Symbiotic Relationships: Mutualism, Commensalism & Parasitism

5. 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.

Populations: Density, Survivorship and Life Histories

6. 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

7. 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.

Dispersal, Colonization, and Island Biogeography

8. Dispersal, Colonization, and Island Biogeography

Have you ever gone in your backyard and discovered a wild raspberry bush that has never been there before? How did it get there? Why is there only one bush year after year? In this lesson, you'll study how plant and animal species colonize in new areas through dispersal and immigration and how some species thrive in a new area while others fail.

Conservation Biology, Habitat Fragmentation, and Metapopulations

9. 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.

Social Behavior: Agonistic, Dominance Hierarchies, & Territoriality

10. Social Behavior: Agonistic, Dominance Hierarchies, & Territoriality

Instead of using words, animals communicate with each other through social behaviors. These actions between individuals may be used to establish rank, defend home and breeding sites, and compete for resources.

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 160 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? Study.com 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 ORELA General Science: Practice & Study Guide course

Support