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Type: Thesis
Title: Palatability variation between the sex phenotypes of bladder saltbush (Atriplex vesicaria) / by Dionne Lee Maywald.
Author: Maywald, Dionne Lee
Issue Date: 1998
School/Discipline: Dept. of Environmental Science and Management
Dept. of Botany
Abstract: Investigates the palatability variation in Atriplex vesicaria Heward ex Benth. (bladder saltbush). The main aim of the research was to examine the idea that the sex phenotypes of this species differ in their palatability to sheep, and to characterise some of the temporal and spatial features of the phenomenon. Intensive small-plot dietary trials, supported by a paddock dietary experiment, cross-fence comparisons and cafeteria trials, showed that sheep preferentially grazed female saltbushes over male and bisexual ones. Sheep avoided male saltbushes due to a chemical deterrent, and used visual (male flower spike) and olfactory cues to detect male plants. The effect of this selective grazing was to reduce the size and reproductive output of female shrubs. Sheep also tended to return to shrubs they had grazed previously. In the semi-arid regions of South Australia, where bladder saltbush is grazed year-round, physical protection is recommended to maximise survival and reproductive output of heavily grazed shrubs.
Dissertation Note: Thesis (Ph.D.)--University of Adelaide, Depts. of Environmental Science & Management and Botany, 1999?
Subject: Atriplex vesicaria.
Grazing Australia, Southern.
Sheep Australia, Southern Feeding and feeds.
Description: Includes bibliographical references (leaves 105-121)
x, 121, [39] leaves : ill., maps ; 30 cm.
Provenance: This electronic version is made publicly available by the University of Adelaide in accordance with its open access policy for student theses. Copyright in this thesis remains with the author. This thesis may incorporate third party material which has been used by the author pursuant to Fair Dealing exception. If you are the author of this thesis and do not wish it to be made publicly available or If you are the owner of any included third party copyright material you wish to be removed from this electronic version, please complete the take down form located at:
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