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Aromatic Rich Natural Organic Matter Increases Growth and Reduces Nickel Toxicity in a Wild Daphnia Hybrid

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dc.contributor.advisorYan, Norman
dc.contributor.advisorArts, Michael
dc.creatorGeiger, Christine Simone
dc.date.accessioned2015-08-28T14:37:05Z
dc.date.available2015-08-28T14:37:05Z
dc.date.copyright2013-08-22
dc.date.issued2015-08-28
dc.date.updated2015-08-28T14:37:04Z
dc.degree.disciplineBiology
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstractNatural organic matter (NOM) is on the rise across the Shield. Its heterogeneous, amalgamate nature makes each NOM source potentially unique. Relatively little is known about the direct effects distinct NOM sources have on daphniids, or the varying protection NOM provides against metal toxicity –specifically Ni. I show that NOM from different natural sources increases growth rates and decreases time to maturation of Daphnia to various degrees. These changes relate to aromatic content of NOM isolates, the mechanism most likely being a hormonal effect or mild oxidative stress. Aromatic content (representing phenolic groups) is also positively related to Ni mitigation for those isolates with specific UV absorbance below 19.3 cm2mg-1. Incorporating NOM aromatic content into a predictive model improves the relationship between predicted and measured LC50s by 5%. I demonstrate that structural differences between NOM isolates relating to aromatic content play a major role in their effects on Daphnia.
dc.identifier.urihttp://hdl.handle.net/10315/29814
dc.language.isoen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectLimnology
dc.subjectToxicology
dc.subjectEcology
dc.subject.keywordsDaphnia
dc.subject.keywordsNickel
dc.subject.keywordsToxicity
dc.subject.keywordsNatural organic matter
dc.subject.keywordsAromatic
dc.subject.keywordsBiotic ligand model
dc.titleAromatic Rich Natural Organic Matter Increases Growth and Reduces Nickel Toxicity in a Wild Daphnia Hybrid
dc.typeElectronic Thesis or Dissertationen_US

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