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dc.contributor.authorPitt, Daniel Brian
dc.date.accessioned2014-03-04T20:37:07Z
dc.date.available2014-03-04T20:37:07Z
dc.date.issued2012-08
dc.identifier.otherpitt_daniel_b_201208_ms
dc.identifier.urihttp://purl.galileo.usg.edu/uga_etd/pitt_daniel_b_201208_ms
dc.identifier.urihttp://hdl.handle.net/10724/28389
dc.description.abstractTsuga canadensis (eastern hemlock) may face ecological extinction in Georgia due to the invasion of Adelges tsugae (hemlock woolly adelgid). We were concerned that hemlock demise would impact stream invertebrates in three ways: tree death, leaching into streams of imidacloprid pesticide to control adelgids, and a future influx of hemlock wood into streams. We hypothesized that only the latter would have a major impact. To test hypotheses, we sampled riffle habitats in a Georgia headwater stream above, in, and below a stand of hemlocks kept alive with insecticide. To mimic a mass hemlock die-off, ~0.06 m3/m2 of variously-sized dead hemlock wood—10 times the ambient supply of dead wood in the stream—was added to 11 of 21 plots. We sampled macroinvertebrates and environmental conditions at all plots for one year before and one year after wood additions. We found that several invertebrates were associated with the center stream reach, presumably because of the presence of living hemlock trees. We found no evidence that past insecticide treatments had harmed invertebrates. Benthic invertebrates responded most strongly to additions of dead hemlock wood. We predict that the major impact of hemlock demise on stream ecosystems will be the future wood influx.
dc.languageeng
dc.publisheruga
dc.rightspublic
dc.subjectAdelgis tsugae
dc.subjectAppalachian
dc.subjectcanopy openness
dc.subjectcoarse woody debris
dc.subjectimidacloprid
dc.subjectindicator taxa
dc.subjectriparian
dc.subjectTsuga canadensis
dc.titlePotential impacts of eastern hemlock (Tsuga canadensis) demise on aquatic macroinvertebrates in a Georgia Appalachian stream
dc.typeThesis
dc.description.degreeMS
dc.description.departmentEntomology
dc.description.majorEntomology
dc.description.advisorDarold Batzer
dc.description.committeeDarold Batzer
dc.description.committeeJames L. Hanula
dc.description.committeeSusan Eggert


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