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Keystone vs Foundation Species: Role of Pisaster Starfish and Kelp

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Derrick Willard
Derrick Willard

Examples of keystone and foundation species.

Educación
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Keystone or Foundation Species?
Keystone or Foundation? ,[object Object],[object Object],[object Object],[object Object],Based on the research of Dr. Robert T. Paine
Dr. Robert T. Paine’s Work (a) The sea star Pisaster ochraceous feeds preferentially on mussels but will consume other invertebrates. With Pisaster (control) Without Pisaster (experimental) Number of species present 0 5 10 15 20 1963 ´64 ´65 ´66 ´67 ´68 ´69 ´70 ´71 ´72 ´73 (b) When Pisaster was removed from an intertidal zone, mussels eventually took over the rock face and eliminated most other invertebrates and algae. In a control area from which Pisaster was not removed, there was little change in species diversity.
Keystone or Foundation? ,[object Object],[object Object],Based on the research of Dr. James H. Brown
Keystone or Foundation? ,[object Object],[object Object],[object Object],[object Object]
Keystone or Foundation? ,[object Object],[object Object],Kelp
Effects of losing the “keystone” predator… ,[object Object],[object Object],Example: Gray Wolf in Yellowstone National Park (Wolf -> Elk -> Cottonwood/Aspen/Willow --> Bird Populations)
Don’t forget… ,[object Object],[object Object]
Sources ,[object Object],[object Object],[object Object],[object Object]

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Keystone vs Foundation Species: Role of Pisaster Starfish and Kelp

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  • 3. Dr. Robert T. Paine’s Work (a) The sea star Pisaster ochraceous feeds preferentially on mussels but will consume other invertebrates. With Pisaster (control) Without Pisaster (experimental) Number of species present 0 5 10 15 20 1963 ´64 ´65 ´66 ´67 ´68 ´69 ´70 ´71 ´72 ´73 (b) When Pisaster was removed from an intertidal zone, mussels eventually took over the rock face and eliminated most other invertebrates and algae. In a control area from which Pisaster was not removed, there was little change in species diversity.
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