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What is keystone species ?...

What is keystone species ?

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A keystone species is a species that has a disproportionately large effect on its environment relative to its abundance. Such species are important in maintaining the structure of an ecological community by affecting other organisms in an ecosystem and helping to determine the abundance of other species in the community, e.g. beaver (a mammal) who creates dams, modifies nutrient cycling, enfluences decomposition dynamics which ultimately influences the plants and animals of that area.
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