测试大自然生产力

• 作者: 郭惠娟
• 来源期刊: 海外英语
• 学科: 文学
• 年，卷（期）: 2003,（3）
• 页码范围: 20-
• 页数: 1页
• 分类号: H31

摘要

　　As animal species become extinct1 and ecosystems less diverse, the environment for remaining species will become less healthy, according to a University of Maryland study. Biology professor Margaret Palmer and doctoral student Bradley Cardinale found that several different species of caddis fly larvae2 living together in a given stream means greater food productivity than when only one species is present.……