Week 4 Study Questions
4-12. Compare and contrast commensalism, mutualism, parasitism, predation, and interspecific competition.
4-13. What is a “keystone species” and how is one identified in an ecosystem? What happens to an ecosystem if a keystone species is removed?
4-14. Describes some ways in which prey species attempt to avoid predation.
4-15. Ecologists maintain that individual prey are harmed during predator-prey interactions, yet at the population level a prey species may benefit from predation? How can this be so?
Study Questions Set #4c (Chapter 4) COMMUNITY PROPERTIES:
4-16. What are the differences among species distribution, species abundance, and species diversity?
4-17. Explain how an ecosystem might have high biologically diversity and low community complexity at the same time.
4-18. What do we mean when we talk about the "stability" of an ecosystem? What is ecosystem "resilience"?
4-19. How might species diversity and community complexity play roles in maintaining stability?
4-20. What are ecotones and how might they
contribute to community complexity?
Study Questions Set #4e (Chapter 4) ECOLOGICAL SUCCESSION:
4-21. What is ecological succession? Describe what causes it.
4-22. What is the difference between primary succession and secondary succession? Which one is often induced by human disturbances?
4-23. Describe what happens in a lake when it goes through ecological succession (you’ll have to go on line to answer this one).
4-24. Does ecological succession reach an end point? Explain.
4-25. How might a non-native species cause instability in an ecosystem?