%0 Journal Article %J BioScience %D 1999 %T The keystone role of bison in North American tallgrass prairie %A Alan K. Knapp %A John M. Blair %A J. M. Briggs %A Scott. L. Collins %A D.C. Hartnett %A Johnson, L.C. %A Towne, E.G. %B BioScience %V 49 %P 39 -50 %G eng %U http://www.jstor.org/stable/10.1525/bisi.1999.49.1.39 %M KNZ00697