在本文中，对关键种的概念进行了讨论，并介绍了关键种的典型特征及其在群落和生态系统中的判别。
This paper discussed the keystone species concept and introduced the typical characteristics of keystone species and their identification in communities or ecosystems.
上海长江口是我国的典型河口，海域水面开阔，资源丰富，具有多种生态系统服务功能。
The typical estuary—Shanghai Yangtze River Estuary, which is full of resources and with widen surface, has many ecosystem services.
新疆艾比湖是典型的干旱区湖泊，作为一个封闭的内陆湖泊，具有特殊的湿地、干旱生态系统。
The Ebinur lake of Xinjiang is located in an arid area, being a closed inland lake with a peculiar wetland-arid ecosystem.
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