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dc.contributor.authorRanganath, Sheila Casabaen_US
dc.date.accessioned2014-03-14T20:39:30Z
dc.date.available2014-03-14T20:39:30Z
dc.date.issued2007-05-29en_US
dc.identifier.otheretd-06062007-095016en_US
dc.identifier.urihttp://hdl.handle.net/10919/33455
dc.description.abstractMeasurements in paired stream reaches with and without livestock access in southwestern Virginia suggest that livestock exclusion practices installed on short, isolated stream reaches result in improved geomorphic and riparian vegetation condition, but do not significantly improve the benthic macroinvertebrate assemblage. Detailed longitudinal and cross-sectional surveys, pebble counts, and rapid geomorphic assessments were conducted on contiguous, paired stream reaches (5 pairs) with and without active livestock access across a range of time since livestock exclusion was implemented. In addition, bank characteristics were quantified by measuring groundcover biomass, shrub crown volume, tree density and diameter, soil bulk density, and particle-size analysis. Benthic macroinvertebrates were collected with a D-frame dip net and quantified using the Virginia Stream Condition Index (SCI), and other benthic macroinvertebrate metrics. We determined that: 1) small lengths of livestock exclusion can significantly increase channel depth and decrease the width to depth ratio, and increase groundcover vegetation growth, but do not significantly alter benthic macroinvertebrate assemblages; and, 2) qualitative geomorphic assessment results showed trends over time since exclusion (0 to greater than 50 years), but not in any of the other parameters evaluated. These observations suggest that a more targeted and holistic approach that addresses watershed-wide impacts must be implemented to restore aquatic habitat. (Key Words: CREP, stream channel morphology, livestock exclusion, agriculture, benthic macroinvertebrates, riparian buffers.)en_US
dc.publisherVirginia Techen_US
dc.relation.haspartSRanganath_Appendices_A-D.pdfen_US
dc.relation.haspartSRanganath_Appendix_H.pdfen_US
dc.relation.haspartSRanganath_Appendices_E-G.pdfen_US
dc.relation.haspartSRanganath_thesis.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectlivestock exclusionen_US
dc.subjectstream channel morphologyen_US
dc.subjectCREPen_US
dc.subjectagricultureen_US
dc.subjectbenthic macroinvertebratesen_US
dc.subjectriparian buffersen_US
dc.titleRecovery of Channel Morphology and Benthic Macroinvertebrate Assemblages after Livestock Exclusionen_US
dc.typeThesisen_US
dc.contributor.departmentBiological Systems Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineBiological Systems Engineeringen_US
dc.contributor.committeechairHession, William Cullyen_US
dc.contributor.committeememberVoshell, J. Reese Jr.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-06062007-095016/en_US
dc.contributor.committeecochairWynn, Theresa M.en_US
dc.date.sdate2007-06-06en_US
dc.date.rdate2007-07-13
dc.date.adate2007-07-13en_US


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