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Effect of pH on phytoplankton and bacteria production

dc.contributor.advisorStoecker, Diane Ken_US
dc.contributor.authorJohns, Desmond Justineen_US
dc.date.accessioned2009-10-06T05:44:29Z
dc.date.available2009-10-06T05:44:29Z
dc.date.issued2009en_US
dc.identifier.urihttp://hdl.handle.net/1903/9487
dc.description.abstractIn recent decades eutrophication has fueled intense phytoplankton blooms that frequently negatively impact ecosystems. Dramatic pH elevations are commonly overlooked during such blooms, which may also be harmful. Cyanobacteria blooms in the Sassafras River, MD were sampled during Autumn 2008 and measured for primary and bacterial production (PP and BP), and differences in bacteria communities composition were examined. pH elevations above 8.8 in the field corresponded to decreased PP, but had no effect on BP. Laboratory experiments demonstrated that negative effects of pH were dependant on light intensity; PP increased with pH at moderate light intensities, but decreased at low irradiance. There was some evidence that BP is affected by high pH, although bacteria community differences as determined by DGGE were not. Negative effects of high pH are probably most important during spring and summer in low salinity environments when pH fluctuations are more common and last longer.en_US
dc.format.extent2248972 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_US
dc.titleEffect of pH on phytoplankton and bacteria productionen_US
dc.typeThesisen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.contributor.departmentMarine-Estuarine-Environmental Sciencesen_US
dc.subject.pqcontrolledBiology, Limnologyen_US
dc.subject.pqcontrolledBiology, Oceanographyen_US
dc.subject.pquncontrolledbacterial productionen_US
dc.subject.pquncontrolledpHen_US
dc.subject.pquncontrolledprimary productionen_US


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