keystone species in a sentence

Examples

1. "Limacina helicina " is a keystone species of mesozooplankton in Arctic pelagic ecosystems.
2. The black-footed ferret is entirely dependent on another keystone species, the prairie dog.
3. The beaver is the keystone species to an aquatic system.
4. The apple snail is a keystone species in Pantanal's ecosystem.
5. Due to these influences, some ecologists have considered the passenger pigeon a keystone species.
6. They are considered to be keystone species due to their impact on their environments.
7. "Pleuragramma antarcticum " is a keystone species in the ecosystem of the Southern Ocean.
8. This is especially common with extinction of keystone species.
9. "Ficus citrifolia " is considered a tropical keystone species.
10. "The lion is a keystone species, " he says.