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AP Biology Reading Guide                                               Chapter 54: Community Ecology
Fred and Theresa Holtzclaw

                                           Name_____________________________Period_________


Chapter 54: Community Ecology

Concept 54.1 Community interactions are classified by whether they help, harm, or have no effect
on the species involved.

1.      What is a community? List six organisms that would be found in your schoolyard community.



2.      This section will look at interspecific interactions. Be clear on the meaning of the prefix! To
        begin, distinguish between intraspecific competition and interspecific competition. Give an
        example of each.

Type of              Explanation                                         Example
Competition
Intraspecific
competition

Interspecific
competition


3.      What is G. F. Gause’s competitive exclusion principle? Give one example.



4.      Define ecological niche.




5.      Several species of Anolis lizards live in the same types of trees and have a similar diet. Discuss
        resource partitioning to explain how interspecific competition is reduced. (Study Figure 54.2.)




6.      What is the difference between the fundamental niche and the realized niche?




Copyright © 2010 Pearson Education, Inc.                                                             -1-
AP Biology Reading Guide                                                 Chapter 54: Community Ecology
Fred and Theresa Holtzclaw

7.       Study Figure 54.5, and then explain what is meant by character displacement. (To do this, you
         will have to learn or review the difference between sympatric populations and allopatric
         populations. You will find this information in Chapter 24.)




8.       Predation is a term that you probably already know. Can you give examples of some
         predator-prey combinations as listed below?

     Predator         Prey                 Example

     Animal           Animal

     Animal           Plant

     Fungus           Animal

     Bacteria         Animal

     Fungus           Plant



9.       List three special adaptations that predator species possess for obtaining food.




10.      List three ways prey species elude predators.




11.      Compare the two types of mimicry.

     Type of Mimicry       Description                                     Example
     Batesian


     Müllerian



12.      What is herbivory?


Copyright © 2010 Pearson Education, Inc.                                                          -2-
AP Biology Reading Guide                                                  Chapter 54: Community Ecology
Fred and Theresa Holtzclaw

13.     Did you list any special herbivore adaptations for predation in your response to question 9? Or
        plant adaptations to avoid herbivory? List two adaptations for each category here.



14.     Describe and give an example of each of the following interactions:

Type of              Description                                           Example
Interaction
symbiosis


parasitism


commensalism


mutualism




15.     Which category above includes the other three? Note that other texts may define this term
        more narrowly.


16.     Your text uses +/– symbols to indicate how interspecific interactions affect survival and
        reproduction of the two species. Use this notation for each of these interactions.

                         Type of Interaction         +/+, +/–, –/–, +/0
                         predation
                         commensalism
                         mutualism
                         parasitism

                         interspecific competition

                         herbivory




Copyright © 2010 Pearson Education, Inc.                                                           -3-
AP Biology Reading Guide                                               Chapter 54: Community Ecology
Fred and Theresa Holtzclaw

17.     What is species diversity? What are its two components? Why is it important?


18.     What does an ecologist summarize in a food web?


19.     Know the levels of trophic structure in food chains. Give a food chain here, including four links
        that might be found in a prairie community, and tell the level for each organism.




20.     Name every organism in the pictured food chain, and give the trophic level in the box.




21.     According to the energetic hypothesis, why are food chains limited in length? How much
        energy is typically transferred to each higher level?



22.     What is a dominant species? For the area where you live, what would be considered a dominant
        tree species?




Copyright © 2010 Pearson Education, Inc.                                                            -4-
AP Biology Reading Guide                                                 Chapter 54: Community Ecology
Fred and Theresa Holtzclaw

23.     How is a keystone species different from a dominant species?



24.     Name one keystone species, and explain the effect its removal has on the ecosystem.



25.     Explain facilitator or foundation species and give an example.



You may omit bottom-up and top-down controls.


Concept 54.2 Disturbance influences species diversity and composition


26.     What is the intermediate disturbance hypothesis? Give an example of a disturbance event, and
        explain the effect it has on the community.




27.     Ecological succession is the changes in species that occupy an area after a disturbance. What is
        the difference between primary succession and secondary succession?




Concept 54.3 Biogeographic factors affect community biodiversity

28.     Explain latitudinal gradients in terms of species richness. Where is species richness greatest?




29.     There are probably two key factors in latitudinal gradients. List and explain both here, and put a
        star next to the one that is probably the primary cause of the latitudinal difference in
        biodiversity.



30.     Explain what is demonstrated by a species-area curve.



Copyright © 2010 Pearson Education, Inc.                                                             -5-
AP Biology Reading Guide                                              Chapter 54: Community Ecology
Fred and Theresa Holtzclaw

31.     Renowned American ecologists Robert MacArthur and E. O. Wilson developed a model of
        island biogeography. While the model can be demonstrated with islands, any isolated habitat
        represents an island. What are the two factors that determine the number of species on the
        island?



32.     What two physical features of the island affect immigration and extinction rates?



33.     Why do small islands have lower immigration rates? Higher extinction rates?



34.     Closer islands have _____________ extinction rates and ______________ immigration rates.



35.     What is the island equilibrium model?



36.     Use this model to describe how an island’s size and distance from the mainland affect the
        island’s species richness.



37.     Label this figure to show immigration, extinction, island size, and equilibrium. Then explain
        what each figure shows.




Copyright © 2010 Pearson Education, Inc.                                                        -6-
AP Biology Reading Guide                                               Chapter 54: Community Ecology
Fred and Theresa Holtzclaw

Concept 54.4 Community ecology is useful for understanding pathogen life cycles and controlling
human disease


38.     Let’s pull a couple of ideas from this section: What is a pathogen?




39.     What is a zoonotic pathogen? List three examples.




40.     What is a vector? List three examples.



Testing Your Knowledge: Self-Quiz Answers

Now you should be ready to test your knowledge. Place your answers here:


1._______2._______3.________4._______5.________6.________7.________8._______9.________




Copyright © 2010 Pearson Education, Inc.                                                        -7-

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Community eco

  • 1. AP Biology Reading Guide Chapter 54: Community Ecology Fred and Theresa Holtzclaw Name_____________________________Period_________ Chapter 54: Community Ecology Concept 54.1 Community interactions are classified by whether they help, harm, or have no effect on the species involved. 1. What is a community? List six organisms that would be found in your schoolyard community. 2. This section will look at interspecific interactions. Be clear on the meaning of the prefix! To begin, distinguish between intraspecific competition and interspecific competition. Give an example of each. Type of Explanation Example Competition Intraspecific competition Interspecific competition 3. What is G. F. Gause’s competitive exclusion principle? Give one example. 4. Define ecological niche. 5. Several species of Anolis lizards live in the same types of trees and have a similar diet. Discuss resource partitioning to explain how interspecific competition is reduced. (Study Figure 54.2.) 6. What is the difference between the fundamental niche and the realized niche? Copyright © 2010 Pearson Education, Inc. -1-
  • 2. AP Biology Reading Guide Chapter 54: Community Ecology Fred and Theresa Holtzclaw 7. Study Figure 54.5, and then explain what is meant by character displacement. (To do this, you will have to learn or review the difference between sympatric populations and allopatric populations. You will find this information in Chapter 24.) 8. Predation is a term that you probably already know. Can you give examples of some predator-prey combinations as listed below? Predator Prey Example Animal Animal Animal Plant Fungus Animal Bacteria Animal Fungus Plant 9. List three special adaptations that predator species possess for obtaining food. 10. List three ways prey species elude predators. 11. Compare the two types of mimicry. Type of Mimicry Description Example Batesian Müllerian 12. What is herbivory? Copyright © 2010 Pearson Education, Inc. -2-
  • 3. AP Biology Reading Guide Chapter 54: Community Ecology Fred and Theresa Holtzclaw 13. Did you list any special herbivore adaptations for predation in your response to question 9? Or plant adaptations to avoid herbivory? List two adaptations for each category here. 14. Describe and give an example of each of the following interactions: Type of Description Example Interaction symbiosis parasitism commensalism mutualism 15. Which category above includes the other three? Note that other texts may define this term more narrowly. 16. Your text uses +/– symbols to indicate how interspecific interactions affect survival and reproduction of the two species. Use this notation for each of these interactions. Type of Interaction +/+, +/–, –/–, +/0 predation commensalism mutualism parasitism interspecific competition herbivory Copyright © 2010 Pearson Education, Inc. -3-
  • 4. AP Biology Reading Guide Chapter 54: Community Ecology Fred and Theresa Holtzclaw 17. What is species diversity? What are its two components? Why is it important? 18. What does an ecologist summarize in a food web? 19. Know the levels of trophic structure in food chains. Give a food chain here, including four links that might be found in a prairie community, and tell the level for each organism. 20. Name every organism in the pictured food chain, and give the trophic level in the box. 21. According to the energetic hypothesis, why are food chains limited in length? How much energy is typically transferred to each higher level? 22. What is a dominant species? For the area where you live, what would be considered a dominant tree species? Copyright © 2010 Pearson Education, Inc. -4-
  • 5. AP Biology Reading Guide Chapter 54: Community Ecology Fred and Theresa Holtzclaw 23. How is a keystone species different from a dominant species? 24. Name one keystone species, and explain the effect its removal has on the ecosystem. 25. Explain facilitator or foundation species and give an example. You may omit bottom-up and top-down controls. Concept 54.2 Disturbance influences species diversity and composition 26. What is the intermediate disturbance hypothesis? Give an example of a disturbance event, and explain the effect it has on the community. 27. Ecological succession is the changes in species that occupy an area after a disturbance. What is the difference between primary succession and secondary succession? Concept 54.3 Biogeographic factors affect community biodiversity 28. Explain latitudinal gradients in terms of species richness. Where is species richness greatest? 29. There are probably two key factors in latitudinal gradients. List and explain both here, and put a star next to the one that is probably the primary cause of the latitudinal difference in biodiversity. 30. Explain what is demonstrated by a species-area curve. Copyright © 2010 Pearson Education, Inc. -5-
  • 6. AP Biology Reading Guide Chapter 54: Community Ecology Fred and Theresa Holtzclaw 31. Renowned American ecologists Robert MacArthur and E. O. Wilson developed a model of island biogeography. While the model can be demonstrated with islands, any isolated habitat represents an island. What are the two factors that determine the number of species on the island? 32. What two physical features of the island affect immigration and extinction rates? 33. Why do small islands have lower immigration rates? Higher extinction rates? 34. Closer islands have _____________ extinction rates and ______________ immigration rates. 35. What is the island equilibrium model? 36. Use this model to describe how an island’s size and distance from the mainland affect the island’s species richness. 37. Label this figure to show immigration, extinction, island size, and equilibrium. Then explain what each figure shows. Copyright © 2010 Pearson Education, Inc. -6-
  • 7. AP Biology Reading Guide Chapter 54: Community Ecology Fred and Theresa Holtzclaw Concept 54.4 Community ecology is useful for understanding pathogen life cycles and controlling human disease 38. Let’s pull a couple of ideas from this section: What is a pathogen? 39. What is a zoonotic pathogen? List three examples. 40. What is a vector? List three examples. Testing Your Knowledge: Self-Quiz Answers Now you should be ready to test your knowledge. Place your answers here: 1._______2._______3.________4._______5.________6.________7.________8._______9.________ Copyright © 2010 Pearson Education, Inc. -7-