About This Chapter
Ecological Relationships and Species Populations - Chapter Summary
This chapter has been assembled to help students, like yourself, study the different types of relationships between different species and their environments. In this chapter you will also learn about the limitations of ecosystems and conservation biology. Following these lessons you should have a better understanding of:
- Competitive exclusion and niche differentiation between competing species
- Species adaptations caused by predator and prey interactions
- Differences between mutualism, commensalism and parasitism
- The study of survivorship and the life histories of species
- Ecosystem carrying capacities, species migrations and species colonization
- Uses of habit fragmentation and metapopulations in conservation biology
- Stages of ecological succession
- Effects of newly introduced species on ecological balance
After you view each video lesson, read over the accompanying transcript to reinforce your understanding of the content covered and study the key vocabulary of the chapter. Then take the lesson's quiz to discover topics you don't understand and use the video tags to return to and study the parts of the lessons that explained them. Once you've completed all the lessons and quizzes, you may test your understanding of the material by completing the practice chapter exam.
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.
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.
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.
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.
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.
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.
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.
8. 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.
9. 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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