| 11. | "Limacina helicina " is a keystone species of mesozooplankton in Arctic pelagic ecosystems.
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| 12. | The black-footed ferret is entirely dependent on another keystone species, the prairie dog.
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| 13. | The beaver is the keystone species to an aquatic system.
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| 14. | The apple snail is a keystone species in Pantanal's ecosystem.
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| 15. | Due to these influences, some ecologists have considered the passenger pigeon a keystone species.
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| 16. | They are considered to be keystone species due to their impact on their environments.
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| 17. | "Pleuragramma antarcticum " is a keystone species in the ecosystem of the Southern Ocean.
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| 18. | This is especially common with extinction of keystone species.
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| 19. | "Ficus citrifolia " is considered a tropical keystone species.
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| 20. | "The lion is a keystone species, " he says.
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