Bison grazing boosts prairie plant diversity 103% over 29 years

A long-term study shows that reintroducing 30 bison to a U.S. prairie increased native plant richness by 103% over 29 years, outperforming cattle by 41% even after droughts. The mechanism is bison reducing dominant plant species, promoting diversity. This provides evidence for bison as a keystone species in grassland restoration.