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Ch 3: Interaction Among Organisms in the Ecosystem

About This Chapter

Watch online video lessons to learn about the different interactions among organisms in an ecosystem. Each lesson is accompanied by a short multiple-choice quiz you can use to check your understanding of topics like interspecific competition, symbiotic relationships and carrying capacity.

Interaction Among Organisms in the Ecosystem - Chapter Summary and Learning Objectives

Within an ecosystem, organisms are in constant interaction. If you think about it, you can see examples of this in your everyday life. Think about the push to 'go green.' The idea behind this has to do with how humans interact with their environment and how those interactions affect other humans and all other living things within the environment. Interactions between living things in an ecosystem are the focus of this chapter. You will learn about predators and prey. Lessons will help you understand the idea of migration. You'll get a chance to better understand how interactions between living things affect the ecosystem as a whole. Some specific things you will learn include:

  • Warning coloration used to confuse predators
  • Symbiotic relationships
  • The carrying capacity of a population
  • Island biogeography
  • Conservation biology
  • The effect of invasive species

VideoObjective
Interspecific Competition, Exclusion, and Niche Differentiation Discover the different types of competitions between similar species in an ecosystem.
Predator/Prey Interactions, Camouflage, Warning Coloration, and Mimicry Examine the different ways prey protect themselves against predators.
Symbiotic Relationships: Mutualism, Commensalism and Parasitism Explore how different organisms live together in one environment.
Populations: Density, Survivorship, and Life Histories Analyze the design of populations, including life histories and survivorship.
Carrying Capacity, Migration and Dispersion Learn about the carrying capacity of a population and how migration and dispersion affect a population.
Dispersal, Colonization, and Island Biogeography Take a look at dispersal and colonization as it relates to a population.
Conservation Biology, Habitat Fragmentation, and Metapopulations Find out about conservation biology, including methods such as habitat fragmentation.
How Introduced and Invasive Species Alter Ecological Balance Study how ecological balance is affected by introduced and invasive species.

8 Lessons in Chapter 3: Interaction Among Organisms in the Ecosystem
Interspecific Competition, Competitive Exclusion & Niche Differentiation

1. 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.

Predator/Prey Interactions, Camouflage, Mimicry & Warning Coloration

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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.

How Introduced and Invasive Species Alter Ecological Balance

8. How Introduced and Invasive Species Alter Ecological Balance

What happens to your block when a new neighbor moves in? Something changes, right? Now think about that on an ecological scale: what happens to an environment when a new SPECIES moves in?

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