Chapter 3: Ecosystems and the Biosphere

Images of (a) Karner blue butterfly and (b) wild lupine live in oak-pine barren habitats in North America.
The (a) Karner blue butterfly and (b) wild lupine live in oak-pine barren habitats in North America. This habitat is characterized by natural disturbance in the form of fire and nutrient-poor soils that are low in nitrogen—important factors in the distribution of the plants that live in this habitat. Researchers interested in ecosystem ecology study the importance of limited resources in this ecosystem and the movement of resources (such as nutrients) through the biotic and abiotic portions of the ecosystem. Researchers also examine how organisms have adapted to their ecosystem. (credit: USFWS)

Learning Outcomes

After studying this chapter, you should be able to:

  • Describe the basic types of ecosystems on Earth
  • Differentiate between food chains and food webs and recognize the importance of each
  • Describe how organisms acquire energy in a food web and associated food chains
  • Discuss the biogeochemical cycles of water, carbon, nitrogen, phosphorus, and sulfur
  • Explain how human activities have impacted these cycles

 Chapter Outline

  • 3.1 Energy Flow through Ecosystems
  • 3.2 Biogeochemical Cycles
  • 3.3 Terrestrial Biomes
  • 3.4 Aquatic Biomes
  • 3.5 Chapter Resources

License

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Introduction to Environmental Sciences and Sustainability Copyright © 2023 by Emily P. Harris is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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