FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2896885968> ?p ?o ?g. }

• W2896885968 abstract "Author(s): Villa-Romero, Juan Fernando | Advisor(s): Pallud, Celine E | Abstract: The Salton Sea in California was formed between 1905-1907 by an accident that diverted Colorado River water to the Salton Sea Basin of the Colorado desert. Since 1924 the Salton Sea serves as an agricultural drainage reservoir maintained by agricultural and municipal wastewater inputs from the Coachella and Imperial Valleys in California and the Mexicali Valley in Mexico. Today, the Salton Sea is California's largest lake by area (975 km2) and constitutes a vital habitat for more than a million birds belonging to more than 400 species, including migratory and endangered populations. The Salton Sea, however, has been called an “ecological time bomb” given the threat that the convergence of selenium accumulation, chemical pollution, water diversion and climate change poses to this unique environment.Selenium (Se) is considered an “essential toxin” due to its role as both an essential nutrient and an environmental contaminant. Selenium contamination is a concern in important areas of the United States, Canada, Mexico, Egypt and Israel where mining, agriculture and the extraction and refinement of fossil fuels and metals lead to selenium release from seleniferous parent rock material and selenium bioaccumulation in wildlife.In aquatic ecosystems, selenium bioaccumulation is preceded by the accumulation of selenium in sediment which is driven by sorption and microbial activity, more specifically, the assimilatory and dissimilatory reduction of water-soluble selenium oxyanions. For the Salton Sea it remains unclear whether the sorptive and reductive capacity of sediments will suffice to prevent dissolved selenium concentrations in water from increasing in the future.In order to characterize the transfer of selenium from water to underlying sediments in the Salton Sea, in this dissertation I describe the spatial variability in sediment parameters controlling selenate reduction rates across seven geographical locations and four depth intervals. I identify organic carbon content in sediment as an important driver of selenium accumulation in Salton Sea littoral sediment due to its dual nature as a sorbant for selenium oxyanions and as a source of reducing power for sediment microbial communities capable of selenate reduction. In the the first chapter, I quantify organic carbon content, selenate reducer abundance, selenium content and potential selenate reduction rates using sediment slurries in sediment collected from seven Salton Sea littoral locations. I show a broad diversity of sediment characteristics and the effect of sediment organic carbon content on selenate reduction potential.In the second chapter, I show a range of Km and Rmax values for selenate and selenate reduction, respectively, comparable to that obtained in sediment collected from eleven geographical locations in the states of California and Nevada. Km values for selenate in evaluated sediment are well above ambient selenate concentrations and therefore microbial communities capable of selenate reduction operate well below their selenate reduction potential. I also show unexpectedly high selenate sorption which, under present conditions, contributes more than microbial activity to selenium retention in sediment.In the third chapter, I use sediment slurries and a microbial consortium recovered from Salton Sea littoral sediment to suggest that nitrate reducers play an important role in selenium accumulation in the Salton Sea. I discuss this data in the context of our current knowledge regarding the microbial pathways of selenate reduction and the thermodynamic constraints associated with selenate respiration and microbial biomass synthesis." @default.
• W2896885968 created "2018-10-26" @default.
• W2896885968 creator A5019613643 @default.
• W2896885968 date "2015-01-01" @default.
• W2896885968 modified "2023-09-26" @default.
• W2896885968 title "The roles of microbial selenate reduction and selenium sorption on selenium immobilization in littoral sediment from the hypersaline Salton Sea, California" @default.
• W2896885968 hasPublicationYear "2015" @default.
• W2896885968 type Work @default.
• W2896885968 sameAs 2896885968 @default.
• W2896885968 citedByCount "0" @default.
• W2896885968 crossrefType "journal-article" @default.
• W2896885968 hasAuthorship W2896885968A5019613643 @default.
• W2896885968 hasConcept C107872376 @default.
• W2896885968 hasConcept C127313418 @default.
• W2896885968 hasConcept C151730666 @default.
• W2896885968 hasConcept C178790620 @default.
• W2896885968 hasConcept C185592680 @default.
• W2896885968 hasConcept C18903297 @default.
• W2896885968 hasConcept C2780347965 @default.
• W2896885968 hasConcept C2816523 @default.
• W2896885968 hasConcept C39432304 @default.
• W2896885968 hasConcept C553756173 @default.
• W2896885968 hasConcept C71572567 @default.
• W2896885968 hasConcept C71915725 @default.
• W2896885968 hasConcept C86803240 @default.
• W2896885968 hasConceptScore W2896885968C107872376 @default.
• W2896885968 hasConceptScore W2896885968C127313418 @default.
• W2896885968 hasConceptScore W2896885968C151730666 @default.
• W2896885968 hasConceptScore W2896885968C178790620 @default.
• W2896885968 hasConceptScore W2896885968C185592680 @default.
• W2896885968 hasConceptScore W2896885968C18903297 @default.
• W2896885968 hasConceptScore W2896885968C2780347965 @default.
• W2896885968 hasConceptScore W2896885968C2816523 @default.
• W2896885968 hasConceptScore W2896885968C39432304 @default.
• W2896885968 hasConceptScore W2896885968C553756173 @default.
• W2896885968 hasConceptScore W2896885968C71572567 @default.
• W2896885968 hasConceptScore W2896885968C71915725 @default.
• W2896885968 hasConceptScore W2896885968C86803240 @default.
• W2896885968 hasLocation W28968859681 @default.
• W2896885968 hasOpenAccess W2896885968 @default.
• W2896885968 hasPrimaryLocation W28968859681 @default.
• W2896885968 hasRelatedWork W2016816900 @default.
• W2896885968 hasRelatedWork W2035075716 @default.
• W2896885968 hasRelatedWork W2088612019 @default.
• W2896885968 hasRelatedWork W2089269870 @default.
• W2896885968 hasRelatedWork W2138107529 @default.
• W2896885968 hasRelatedWork W2198699302 @default.
• W2896885968 hasRelatedWork W2301532284 @default.
• W2896885968 hasRelatedWork W2330033333 @default.
• W2896885968 hasRelatedWork W2579894614 @default.
• W2896885968 hasRelatedWork W2594588781 @default.
• W2896885968 hasRelatedWork W2599480711 @default.
• W2896885968 hasRelatedWork W2744388139 @default.
• W2896885968 hasRelatedWork W2754973692 @default.
• W2896885968 hasRelatedWork W2887448228 @default.
• W2896885968 hasRelatedWork W290125467 @default.
• W2896885968 hasRelatedWork W2924169648 @default.
• W2896885968 hasRelatedWork W3083581104 @default.
• W2896885968 hasRelatedWork W3090365859 @default.
• W2896885968 hasRelatedWork W3144736364 @default.
• W2896885968 hasRelatedWork W3162097691 @default.
• W2896885968 isParatext "false" @default.
• W2896885968 isRetracted "false" @default.
• W2896885968 magId "2896885968" @default.
• W2896885968 workType "article" @default.