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Sea otters are an example of a keystone species because due to their feeding habits, kelp is allowed to flourish which leads to absorption of high amounts of #CO_2#, preservation of the organisms which rely on kelp for survival, as well as protecting coastlines.
The role that a keystone species plays in its ecosystem is analogous to the role of a keystone in an arch. While the keystone is under the least pressure of any of the stones in an arch, the arch still collapses without it.Similarly, an ecosystem may experience a dramatic shift if a keystone species is removed, even though that species was a small part of the ecosystem by measures of biomass or productivity.It became a popular concept in conservation biology.he jaguar, whose numbers in Central and South America have been classified as near threatened, acts as a keystone predator by its widely varied diet, helping to balance the mammalian jungle ecosystem with its consumption of 87 different species of prey. The gray wolf is another known keystone species as is the lion.