| 21. | The fern is a keystone species in Hawaiian ecosystems, and primary productivity in some areas.
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| 22. | The Salmon is a keystone species culturally and ecologically to the Tsi Aki Maidu tribe.
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| 23. | The whitebark pine is a keystone species in upper subalpine forests of the northern Rocky Mountains.
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| 24. | They are considered keystone species within their habitat.
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| 25. | The prairie was formerly maintained by grazing pressure of American bison, which is the keystone species.
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| 26. | Oaks are keystone species in a wide range of habitats from Mediterranean semi-desert to subtropical rainforest.
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| 27. | Is the human a kind of keystone species?
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| 28. | They may also serve as keystone species, regulating the populations of the species they prey on.
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| 29. | Gopher tortoises are found in many areas, the burrows they dig making them a keystone species.
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| 30. | Figs are sometimes considered to be potential keystone species in communities of black howler monkeys in Belize.
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