[Answer] What is the main characteristic of a keystone species?

Step 1 : Introduction to the question " What is the main characteristic of a keystone species? "

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Every ecosystem has certain species that are critical to the survival of the other species in the system. The keystone species could be a huge predator or an unassuming plant, but without them the ecosystem may not survive.

In any type of ecosystem, a keystone species is an organism that helps hold the system together. Without its keystone species, ecosystems would look very different. Some ecosystems might not be able to adapt to environmental changes if their keystone species disappeared. That could spell the end of the ecosystem, or it could allow an invasive species to take over and dramatically shift the ecosystem in a new direction.

There are three types of keystone species cited by many scientists: predators, ecosystem engineers, and mutualists.

More Info: www.nationalgeographic.org

Step 2 : Answer to the question " What is the main characteristic of a keystone species? "

It is a mutualist:

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