详细书目
| 类型/形式: | Juvenile literature |
|---|---|
| 材料类型: | 小学和初中 |
| 文件类型: | 书 |
| 所有的著者/提供者: |
Valerie Rapp |
| ISBN: | 0822521369 9780822521365 |
| OCLC号码: | 46590038 |
| 描述: | 72 p. : ill. (some col.), col. maps ; 26 cm. |
| 内容: | What is an ecosystem? -- Columbia River ecosystem; a natural history -- In the mountains; streams -- Coming out of the mountains; medium-sized rivers -- In the valleys; large rivers -- Wild salmon; a keystone species -- People and the Columbia River basin -- What you can do. |
| 丛书名: | Ecosystems in action. |
| 责任: | Valerie Rapp. |
摘要:
Go on a journey that begins in small mountain streams and passes through large rivers to the ocean. Using the Columbia River Basin as an example, Life in a River examines the physical features, processes, and many different species of plants and animals that make up a unique river ecosystem. Find out about the impact of humans on this once-pristine ecosystem and what is being done to save it. Follow the river on its amazing journey and learn what makes it so special.
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