Has a disproportionately large impact on ecosystem structure relative to its abundance Removing a keystone species (e.g., sea otters in kelp forests) reshapes the entire community.

Has a moderate impact on ecosystem structure only when present in very low numbers

Has an impact on ecosystem structure roughly proportional to its population abundance

Has a disproportionately large impact on ecosystem structure relative to its abundance

Has a small impact on ecosystem structure despite being highly abundant in the community

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Acemy

Community Ecology

AP Biology· difficulty 3/5

A keystone species

A
$Has a moderate impact on ecosystem structure only when present in very low numbers$
B
$Has an impact on ecosystem structure roughly proportional to its population abundance$
C
$Has a disproportionately large impact on ecosystem structure relative to its abundance$
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D
$Has a small impact on ecosystem structure despite being highly abundant in the community$

Explanation

Removing a keystone species (e.g., sea otters in kelp forests) reshapes the entire community.

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