Book Creator

Keystone Species of the World

by Brian Ebaugh

Pages 4 and 5 of 377

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North America
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Purple Sea Star
Pisaster Ochraceus
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3. The purple sea star was one of the first keystone species identified by scientists. It is a top predator that keeps the number of species in tide pools relatively stable.
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Zoe
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North America
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Purple Sea Star
Pisaster Ochraceus
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4. Paine did experiments where he removed species other than the purple sea star from tide pools but it didn't have as much as an impact. In 1969, Paine invented the concept of the "keystone species" to describe the sea stars large effect.
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