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dc.creatorErickson, Daniel Lawrenceen_US
dc.date.accessioned2012-06-07T22:44:26Z
dc.date.available2012-06-07T22:44:26Z
dc.date.created1996en_US
dc.date.issued1996
dc.identifier.urihttp://hdl.handle.net/1969.1/ETD-TAMU-1996-THESIS-E75en_US
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to digital@library.tamu.edu, referencing the URI of the item.en_US
dc.descriptionIncludes bibliographical references: p.84-89.en_US
dc.descriptionIssued also on microfiche from Lange Micrographics.en_US
dc.description.abstractThis paper describes the development of RLUM, an integrated spatially explicit, prototypic, ruminant landscape use model. RLUM integrates several component models: weather, plant growth, ruminate nutrition, diet selection and physio-behavior with a geographic information system (GIS) based animal movement and foraging model. In addition to housing the movement and foraging simulation model, the GIS enables us to explicitly represent landscape features. RLUM simulates landscape use for an entire herd (95 head) of cattle. Historical weather files were used as input into the plant growth and physiobehavior models. The physio-behavior model determines an animal's current physiological status in terms of hydric, thermal, and hunger balance equations. Information on the animal's physiological status is used to determine its behavior, which in turn determines where the animal will move on the simulated landscape. Several aspects of model performance were evaluated using field data collected as part of this study as well as published literature. Simulated landscape use patterns show a tight pattern concentrated around water sources whereas observed landscape This paper describes the development of RLUM, an integrated spatially explicit, prototypic, ruminant landscape use model. RLUM integrates several component models: weather, plant growth, ruminate nutrition, diet selection and physio-behavior with a geographic information system (GIS) based animal movement and foraging model. In addition to housing the movement and foraging simulation model, the GIS enables us to explicitly represent landscape features. RLUM simulates landscape use for an entire herd (95 head) of cattle. Historical weather files were used as input into the plant growth and physiobehavior models. The physio-behavior model determines an animal's current physiological status in terms of hydric, thermal, and hunger balance equations. Information on the animal's physiological status is used to determine its behavior, which in turn determines where the animal will move on the simulated landscape. Several aspects of model performance were evaluated using field data collected as part of this study as well as published literature. Simulated landscape use patterns show a tight pattern concentrated around water sources whereas observed landscape use patterns were more diffuse. Differences in the observed vs. simulated landscape use patterns can be explained by the fact that an entire herd and not individuals or subherds were modeled from a single water point. Also, the initial starting conditions (i.e. forage availability and distribution) resemble that of a pasture that was deferred from grazing, yet in reality the study pastures were continuously stocked. This study has shown that simulation models and geographic information systems can be integrated to simulate landscape use by cattle. In addition, RLUM has established a framework for future development of multi-species, multi-scale landscape use models.en_US
dc.format.mediumelectronicen_US
dc.format.mimetypeapplication/pdfen_US
dc.language.isoen_USen_US
dc.publisherTexas A&M Universityen_US
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en_US
dc.subjectrangeland ecology and management.en_US
dc.subjectMajor rangeland ecology and management.en_US
dc.titleDevelopment of a spatially explicit ruminant landscape use model (RLUM)en_US
dc.typeThesisen_US
thesis.degree.disciplinerangeland ecology and managementen_US
thesis.degree.nameM.S.en_US
thesis.degree.levelMastersen_US
dc.type.genrethesis
dc.type.materialtexten_US
dc.format.digitalOriginreformatted digitalen_US


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