An alligator is an example of a keystone species. What is the definition of a keystone species?

A. A species with no influence on the ecosystem and could be safely removed.

B. A species with significant influence on the structure and functioning of that ecosystem.

C. A species that prefers to reside on top of or close to stone.

A keystone species is vital to maintaining ecosystem structure and function, with significant influence on its community dynamics. Examples include species like alligators that affect the habitat and population dynamics of numerous other species. Removing such species can lead to drastic changes in the ecosystem.

Explanation:

Definition of a Keystone Species

A keystone species is defined as a species that has a significant influence on the structure and functioning of an ecosystem. These species are crucial for maintaining the ecological balance because their presence or absence can dramatically change the way the ecosystem operates. For example, alligators in freshwater ecosystems help control the populations of other species and create habitats for various organisms by forming ‘alligator holes’ that provide water and shelter for fish, birds, and other wildlife during dry periods.

Why Are Keystone Species Important?

They contribute to biodiversity.
They help in nutrient cycling.
They provide stability to the ecosystem.

In contrast, the options stating that a keystone species is one with no influence or that simply prefers being on stone are incorrect. Removing a keystone species can lead to unforeseen consequences that disrupt the ecosystem.

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