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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.
Species interactions within ecological webs include four main types of two-way interactions: mutualism, commensalism, competition, and predation (which includes herbivory and parasitism).Because of the many linkages among species within a food web, changes to one species can have far-reaching effects.he keystone species concept is one of the best-known ideas in community ecology. Although it is true that many species potentially interact with one another in a food web such as depicted in Figure 1, in nature there are big players and little players. The biggest players of all are referred to as keystone species.