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Question
Name the key stone species and effect on ecosystem due to its extinction from local geographical area (Yellowstone National Park) of North America.
Name the key stone species and effect on ecosystem due to its extinction from local geographical area (Yellowstone National Park) of North America.
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Solution
The correct option is C Species: Wolf, Effect: Overgrazing
Keystone species are defined as a species that has a disproportionately large effect on its natural environment. They play unique and essential roles that maintain the integrity of the ecosystem. The decline or disappearance of keystone species will have cascading effects within the ecosystem which will trigger declines in other species. For example, wolves are considered keystone species in Yellowstone National Park of North America. The local extinction of wolves [Figure A] from Yellowstone National Park resulted in over-grazing of the habitat by the herbivores whose populations and movements were controlled by the wolves.
Figure A
Keystone species are defined as a species that has a disproportionately large effect on its natural environment. They play unique and essential roles that maintain the integrity of the ecosystem. The decline or disappearance of keystone species will have cascading effects within the ecosystem which will trigger declines in other species. For example, wolves are considered keystone species in Yellowstone National Park of North America. The local extinction of wolves [Figure A] from Yellowstone National Park resulted in over-grazing of the habitat by the herbivores whose populations and movements were controlled by the wolves.
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