01416nas a2200181   4500008004100000245007800041210006900119300001300188490000800201520080000209653002201009100002401031700002001055700001901075700002001094700002001114856010001134       1998                        eng d00aModulation of diversity by grazing and mowing in native tallgrass prairie0 aModulation of diversity by grazing and mowing in native tallgras  a745 -7470 v2803 aSpecies diversity has declined in ecosystems worldwide as a result of habitat fragmentation, eutrophication, and land-use change. If such decline is to be halted ecological mechanisms that restore or maintain biodiversity are needed. Two long-term field experiments were performed in native grassland to assess the effects of fire, nitrogen addition, and grazing or mowing on plant species diversity. In one experiment, richness declined on burned and fertilized treatments, whereas mowing maintained diversity under these conditions. In the second experiment, loss of species diversity due to frequent burning was reversed by bison, a keystone herbivore in North American grasslands. Thus, mowing or the reestablishment of grazing in anthropogenically stressed grasslands enhanced biodiversity.10atallgrass prairie1 aCollins, Scott., L.1 aKnapp, Alan, K.1 aBriggs, J., M.1 aBlair, John, M.1 aSteinauer, E.M.  uhttp://knz.lternet.edu/content/modulation-diversity-grazing-and-mowing-native-tallgrass-prairie