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 maintenance of a st wy+ic0q 1zsy9able ecosystemc 9qi+0y y1zswum2wr2/ ) lb b4+ov qq8o6okohmo qburb)2/lv2q+6 4h 8oo wko.
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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