The effect of experimental manipulation of sympatric populations of three rodent species during a declining population phase

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dc.contributor.advisorJameson, David L.
dc.contributor.committeeMemberThurner, Ronald D.
dc.contributor.committeeMemberBryant, Edwin H.
dc.contributor.committeeMemberAumann, Glenn David
dc.creatorJoule, James
dc.date.accessioned2022-08-31T19:25:54Z
dc.date.available2022-08-31T19:25:54Z
dc.date.copyright1970
dc.date.issued1970
dc.description.abstractThree abundant rodents, the hispid cotton rat (Sigmodon hispidus), the fulvous harvest mouse (Reithrodontomys fulvescens), and the eastern rice rat (Oryzomys palustris) are sympatric in southest Texas. From January 1970 to May 1970 six presumably homogeneous areas, three experimental and three control, were live-trapped. Mark-release-recapture and selective removal techniques were used to monitor species compositions within the areas. Estimates of the number of individuals per species, body weights, and sex ratios were obtained at two week intervals throughout the study. Linear regression analysis was used to describe the detectable weight changes under various conditions. When S. hispidus was experimentally removed no change in the mean weights of R. fulvescens and O. palustris was evident. When R. fulvescens and O. palustris were removed S. hispidus females exhibited a significant increase in mean weight. Selective removal of a species appears to have fixed effect on the total number of animals per unit area over a short period of time. A significant change in sex ratio of Sigmodon, from a greater proportion of males to females, was recorded in the areas where Reithrodontomys and Oryzomys were removed. Although the number of captures per species declined, comparisons of the different experimental manipulations could be made throughout the study.
dc.description.departmentBiology and Biochemistry, Department of
dc.format.digitalOriginreformatted digital
dc.format.mimetypeapplication/pdf
dc.identifier.other17972067
dc.identifier.urihttps://hdl.handle.net/10657/10865
dc.language.isoen
dc.rightsThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. Section 107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.
dc.titleThe effect of experimental manipulation of sympatric populations of three rodent species during a declining population phase
dc.type.dcmiText
dc.type.genreThesis
dcterms.accessRightsThe full text of this item is not available at this time because it contains documents that are presumed to be under copyright and are accessible only to users who have an active CougarNet ID. This item will continue to be made available through interlibrary loan.
thesis.degree.collegeCollege of Arts and Sciences
thesis.degree.departmentBiology, Department of
thesis.degree.disciplineBiology
thesis.degree.grantorUniversity of Houston
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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