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dc.contributor.authorRoberts, Lenn Darrellen_US
dc.date.accessioned2014-03-14T20:45:09Z
dc.date.available2014-03-14T20:45:09Z
dc.date.issued2005-08-30en_US
dc.identifier.otheretd-09102005-224327en_US
dc.identifier.urihttp://hdl.handle.net/10919/35004
dc.description.abstractThe direct effects of a Virginia trout farm on benthic macroinvertebrates were examined using multiple approaches. Static laboratory tests with the amphipod, Hyallela azteca, were conducted with exposures to water taken from a spring, effluent above a sedimentation basin, and effluent below a sedimentation basin. On-site mesocosms were constructed to expose previously colonized artificial substrates to the same treatments as the laboratory tests. Flat-headed mayflies were also collected from a nearby stream and transported to the mesocosms for a 10 day exposure. There was no significant difference between treatments in the laboratory tests after 20 days, but after 28 days the control was significantly lower than the above sedimentation basin treatment in one test. In the multispecies field tests, a clear decrease in total invertebrate abundance and EPT abundance was seen in the effluent treatments compared to the spring water treatments, with a slight improvement in survival in the treatment below the sedimentation basin. However, only total invertebrate abundance after 21 days produced statistically significant differences. A significant difference was detected between the effluent and the spring treatments in the flat-headed mayfly field test. We suggest that the effects seen in this study do not explain the lack of taxa richness in the receiving stream. The main cause of mortality from trout effluents appears to be solids accumulating upon the organisms, and sedimentation basins should be effective best management practices for protecting macroinvertebrates.en_US
dc.publisherVirginia Techen_US
dc.relation.hasparttroutfarmthesis.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.subjectHyallela aztecaen_US
dc.subjectartificial substratesen_US
dc.subjectbenthic macroinvertebratesen_US
dc.subjecttrout effluentsen_US
dc.titleBenthic Macroinvertebrate Susceptibility to Trout Farm Effluentsen_US
dc.typeThesisen_US
dc.contributor.departmentEnvironmental Sciences and 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.disciplineEnvironmental Sciences and Engineeringen_US
dc.contributor.committeechairBoardman, Gregory D.en_US
dc.contributor.committeememberVoshell, J. Reese Jr.en_US
dc.contributor.committeememberDietrich, Andrea M.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09102005-224327/en_US
dc.date.sdate2005-09-10en_US
dc.date.rdate2005-09-23
dc.date.adate2005-09-23en_US


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