The Impact of Freshwater Salinization on the Osmoregulatory Physiology of Mayfly Nymphs (Hexagenia Rigida)

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dc.contributor.advisorKelly, Scott
dc.contributor.advisorDonini, Andrew
dc.contributor.authorNowghani, Fargol
dc.date.accessioned2020-05-11T12:37:39Z
dc.date.available2020-05-11T12:37:39Z
dc.date.copyright2019-08
dc.date.issued2020-05-11
dc.date.updated2020-05-11T12:37:39Z
dc.degree.disciplineBiology
dc.degree.levelMaster's
dc.degree.nameMSc - Master of Science
dc.description.abstractFreshwater (FW) salinization (the accumulation of salt in FW), is an environmental issue which threatens the health of FW ecosystems worldwide. This study used FW nymphs of the mayfly Hexagenia rigida, to provide a first examination of the effect of salinization on physiological mechanisms of ion transport in this important North American FW invertebrate. Following exposure of mayfly nymphs to sub-lethal levels of salt (7 days in 7.25 g/L NaCl) alterations in morphology and function of ion regulatory organs were found. The enigmatic tracheal gill became an ion secretory organ, instead of acquiring ions as it normally does in FW and the urine producing excretory system of H. rigida reduced salt reabsorption rates. Data indicate that ion regulatory machinery of H. rigida can reorganize in response to low levels of salt contamination, but these alterations are likely to come at a cost because ion transport mechanisms are not functioning normally.
dc.identifier.urihttps://hdl.handle.net/10315/37359
dc.languageen
dc.rightsAuthor owns copyright, except where explicitly noted. Please contact the author directly with licensing requests.
dc.subjectEcology
dc.subject.keywordsWater salinity
dc.subject.keywordsFreshwater contamination
dc.subject.keywordsInvertebrate physiology
dc.subject.keywordsMayfly nymphs
dc.subject.keywordsAquatic insect
dc.subject.keywordsSedimentary
dc.subject.keywordsDeicing agent
dc.subject.keywordsRoad salt
dc.subject.keywordsWater and ion balance
dc.subject.keywordsHaemolymph osmolality
dc.titleThe Impact of Freshwater Salinization on the Osmoregulatory Physiology of Mayfly Nymphs (Hexagenia Rigida)
dc.typeElectronic Thesis or Dissertation

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