Errata page is behind title page (p. i) / Copies of author's previously published articles inserted / Bibliography: leaves 121-156 / xi, 169, 32 leaves, 70 p. : ill., maps ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Investigates several questions relating to the impact of continuous sheep grazing on the farm, structure and botancial composition of chenopod shrublands. Examines the effect of domestic livestock on ecological variables in three arid chenopod shrubland paddocks of South Australian rangelands. / Thesis (Ph.D.)--University of Adelaide, Dept. of Botany, 1997