This led to his 1969 paper where he proposed the keystone species concept.

Organisms known as keystone species are vital to the stability of their community.

It was here that much of his research of keystone species occurred.

This is especially common with extinction of keystone species.

Coextinction is especially common when a keystone species goes extinct.

A different class of keystone species is what are termed 'ecosystem engineers'.

They are considered to be keystone species due to their impact on their environments.

By analyzing network structures, one can determine keystone species that are of particular importance.

This keystone species effect forms the basis for the concept of ecological extinction.

As keystone species, the resurgence of beaver is a critical event for the region.

The devil is a keystone species in the ecosystem of Tasmania.

If such keystone species are lost, biologists say, the rest of the ecosystem can begin to unravel.

In the Great Plains, the prairie dog is a keystone species.

The wolf was the top predator in Yellowstone, and a keystone species of its ecology, until 1926.

Some scientists consider spruce bark beetles to be a keystone species.

Others argue that they cannot be a keystone species because they are invasive to the area.

Because of their large size, elephants have a huge impact on their environments and are considered keystone species.

As a keystone species, oysters provide habitat for many marine species.

Replies: A keystone species is one that plays a critical role in maintaining the structure of the ecosystem around them.

The only way to know a keystone species is to have a very good understanding of the whole system and how all the different parts work together.

Some species, called a keystone species, form a central supporting hub in the ecosystem.

Ecologists consider this rodent to be a keystone species.

Beaver are a keystone species helping support the ecosystem of which they are a part.

Wildlife sanctuaries are created for the preservation of an important keystone species in the ecosystem.

For example, some non-natives become keystone species and their removal can cause more harm than good to the ecosystem.