本题目来源于试卷: SL/HL Topic D4.2 Stability and change，类别为 IB生物学
[问答题]
6. Outline the role of keystone species in the mx7+v f-ju:xt sbjfj,y6ul.z 7ainten2dgeo 3a61ebtance of a stable ecosystemb16et32ao dge .
参考答案: Keystone species have a high impact on the ecosystem.
The population of a keystone species may be small (but the impact is significant).
Keystone species have a critical role in stability of ecosystems / Loss of keystone species can cause instability or collapse of ecosystem. Keystone species contribute to the maintenance of diversity.
The keystone species have a top-down effect on populations of other organisms in the ecosystem. Top predators and predators of herbivores are typical examples of keystone species.
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