A keystone in an arch's crown secures the other stones in place. Keystone species play the same role in many ecological communities by maintaining the structure and integrity of the community.

University of Delaware entomologist Doug Tallamy's research has identified “keystone” plant species that make up the ...

University of Delaware entomologist Doug Tallamy’s research identified “keystone” plant species that make up the foundation of many U.S.

Oaks, Asters and 6 Other 'Keystone' Native Species to Plant for Biodiversity University of Delaware entomologist Doug Tallamy's research has identified “keystone” plant species that make up ...