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Chapter 26
Terrestrial and Aquatic Ecosystems
THEMES AND OBJECTIVES
The following is a list of the main themes covered in this chapter and some study objectives. As
you study, focus on these areas. Understand how the information you study fits into these themes
and how these themes relate to each other. Be sure you master each objective before moving on.
1. Ecosystems are determined by the climate of the area.
 Explain how climate is determined.
 Explain why climate determines the populations that can inhabit an area.
 Discuss how latitude and elevation are both determinants of ecosystems.
2. Terrestrial ecosystems are largely determined by precipitation and temperature.
 Review the characteristics, locations, and organisms of the major terrestrial ecosystems.
 Discuss ways in which human activity is having an impact on each of these ecosystems.
3. Ocean ecosystems differ according to temperature, depth, and distance from shore.
 Review the characteristics, locations, and organisms of the major oceanic ecosystems.
 Discuss ways in which human activity is having an impact on each of these ecosystems.
4. Estuaries and marshes are the most productive of all ecosystems.
 Explain why these ecosystems are so valuable and productive, and how humans are
affecting them.
5. Limnology is the study of bodies of fresh water.
 Discuss factors that affect freshwater ecosystems.
 Explain the effect of fall and spring turnovers.

Explain the basic differences between eutrophic and oligotrophic lakes and the impact of human
activity on freshwater.