Effects of grazing on waterfowl cover in wetlands in the White Mountains, Arizona / Theresa M. Hoff.
Material type:
TextPublication details: Flagstaff, AZ : Northern Arizona University, 1993.Description: ix, 107 leaves : ill. ; 28 cmOnline resources: Abstract: The relationships among upland vegetation structure, cattle grazing, and upland waterfowl nesting habitat were studied on montane wetlands. The vegetation height-density, the percent aerial cover of vegetation, and waterfowl nest characteristics were compared between historically grazed and ungrazed sites by cattle. The residual vegetation height-density was significantly higher on ungrazed compared to grazed sites. However, the difference was small. The August vegetation height-density and the change in the vegetation height-density were not significantly different between historically grazed and ungrazed sites. The aerial cover of bare ground was significantly higher on historically grazed areas compared to ungrazed areas, whereas no significant differences were found in the percent aerial cover for forb or grass. The largest difference between the grazing treatments occurred at an ungrazed site that had been protected from grazing for over fifty years. A regresssion model was devel
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Thesis(M.S.)-- Northern Arizona University, 1993.
Includes bibliographical references (leaves 77-84).
The relationships among upland vegetation structure, cattle grazing, and upland waterfowl nesting habitat were studied on montane wetlands. The vegetation height-density, the percent aerial cover of vegetation, and waterfowl nest characteristics were compared between historically grazed and ungrazed sites by cattle. The residual vegetation height-density was significantly higher on ungrazed compared to grazed sites. However, the difference was small. The August vegetation height-density and the change in the vegetation height-density were not significantly different between historically grazed and ungrazed sites. The aerial cover of bare ground was significantly higher on historically grazed areas compared to ungrazed areas, whereas no significant differences were found in the percent aerial cover for forb or grass. The largest difference between the grazing treatments occurred at an ungrazed site that had been protected from grazing for over fifty years. A regresssion model was devel