01780naa a2200217 a 450000100080000000500110000800800410001910000180006024501490007826000090022752011600023665000150139665000280141165000110143965000160145065300150146665300150148165300100149670000180150677300380152417914572017-04-05       1985    bl ---       0--  u    #d1 aCARMAN, J. G.  aMorphologic and allozymic variation between long-term grazed and non-grazed populations of the bunchgrass Schizachyrium scoparium var. frequens.  c1985  aPlant populations of Schizachyrium scoparium var. frequens with a history of long-term grazing by domestic herbivores were characterized by shorter and narrower leaf blades and tillers of lower weight than plants from populations with a history of no grazing. Following four biweekly defoliation events plants from the grazed populations additionally displayed lower specific leaf weights, lower amounts of biomass removed per tiller upon defoliation and a greater number of new and regrowing tillers. Production values per plant remained similar between the two populations because of a greater number of tillers per plant in the grazed population. A large amount of allozymic polymorphism was observed in both the grazed and non-grazed populations. results of the electrophoretic analyses indicated that a minimum of 66% of the plants sampled represented separate genotypes. No distinction could be made between grazed and non-grazed populations in terms of allozymic partitioning. The morphological variation observed between these two populations may represent a shift in the relative dominance of a series of genotypes variously adapted to herbivory.  apopulation  aSchizachyrium scoparium  aPlanta  aPopulação  aMorfologia  aMorphology  aPlant1 aBRISKE, D. D.  tOecologiagv.66, p.332-337, 1985.