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Diel Temperature and Dissolved Oxygen Patterns in Sites with and without Planktonic Life Stage of Thompsodinium intermedium in Comal Springs, TX

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dc.contributor.advisor Wormuth, John en_US
dc.creator Gilpin, Cheryl en_US
dc.date.accessioned 2012-07-16T15:58:54Z en_US
dc.date.accessioned 2012-07-16T20:29:39Z
dc.date.available 2014-09-16T07:28:20Z
dc.date.created 2012-05 en_US
dc.date.issued 2012-07-16 en_US
dc.date.submitted May 2012 en_US
dc.identifier.uri http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11222 en_US
dc.description.abstract Between July 2009 and October 2011, a new habitat was found for a rarely reported freshwater dinoflagellate species, Thompsodinium intermedium - Comal Springs (Comal County), Texas. In 2011, diel in-situ monitoring in monospecific blooms of this species revealed previously undetected negative impacts on endangered species habitat availability associated with conditions of low flow levels, recorded at the U.S. Geological Survey gage # 08169000 on Texas Commission on Environmental Quality river segment 1811 station 12655. During a period of low springflow in the summer of 2011, late afternoon and early morning measurements of dissolved oxygen and temperature and presence of dinoflagellate blooms were monitored at six sites. Significant differences in diel fluctuations were found in all of these parameters among sites with and without the planktonic blooms. These fluctuations increased risk of hypoxia and hyperthermia conditions at sites of planktonic bloom events. Arrays of in-situ continuous monitoring temperature/light probes were used inside and outside of blooms. Wildlife and human health implications are that hypoxia and hyperthermia are known to promote conditions favorable to harmful microbes which may be transported from springs to coastal bays. In-situ data demonstrated that T. intermedium blooms, hypoxia, and hyperthermia occurred in the upper Comal headwaters. These natural environmental stressors may be avoidable if adequate springflows are maintained to buffer against these impacts. en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.subject Freshwater dinoflagellate en_US
dc.subject Karst spring ecohydrology en_US
dc.subject drought en_US
dc.subject low springflows en_US
dc.subject temperature extremes en_US
dc.subject hypoxia en_US
dc.subject hyperthermia en_US
dc.subject Comal Springs en_US
dc.subject Comal River en_US
dc.subject Aransas National Wildlife Refuge Fountain Darter en_US
dc.subject Etheiostoma fonticola en_US
dc.subject Whooping Crane Grus americana en_US
dc.subject interference with sewage detection en_US
dc.subject Contact recreation en_US
dc.subject endangered species protection en_US
dc.subject Habtiat Conservation Plan en_US
dc.subject Edwards Aquifer Heterelmis comalensis en_US
dc.subject Stygobromus peckii en_US
dc.subject E. coli springflow buffering en_US
dc.subject stratification en_US
dc.title Diel Temperature and Dissolved Oxygen Patterns in Sites with and without Planktonic Life Stage of Thompsodinium intermedium in Comal Springs, TX en_US
dc.type Thesis en
thesis.degree.department Oceanography en_US
thesis.degree.discipline Oceanography en_US
thesis.degree.grantor Texas A&M University en_US
thesis.degree.name Master of Science en_US
thesis.degree.level Masters en_US
dc.contributor.committeeMember von Zharen, Wyndolyn en_US
dc.contributor.committeeMember Thornton, Dan en_US
dc.contributor.committeeMember Guillen, George en_US
dc.type.genre thesis en_US
dc.type.material text en_US
local.embargo.terms 2014-07-16 en_US


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