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Comparing Multiple Approaches to Reconstructing the Phosphorus History of Marl Lakes: A Utah Lake Case Study.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Comparing Multiple Approaches to Reconstructing the Phosphorus History of Marl Lakes: A Utah Lake Case Study./
Author:	Devey, Mark R.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
Description:	62 p.
Notes:	Source: Masters Abstracts International, Volume: 83-10.
Contained By:	Masters Abstracts International83-10.
Subject:	Water resources management. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29067526
ISBN:	9798209994473

Comparing Multiple Approaches to Reconstructing the Phosphorus History of Marl Lakes: A Utah Lake Case Study.
Devey, Mark R.

Comparing Multiple Approaches to Reconstructing the Phosphorus History of Marl Lakes: A Utah Lake Case Study. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 62 p.

Source: Masters Abstracts International, Volume: 83-10.

Thesis (M.S.)--Utah State University, 2022.

This item must not be sold to any third party vendors.

Cultural eutrophication driven by excess phosphorus loading is among the greatest threats to freshwater lakes globally. Utah Lake in central Utah, USA is an example of a lake increasingly experiencing cyanobacterial blooms, which are likely a product of cultural eutrophication in recent decades. However, there is uncertainty about how phosphorus loading and concentrations in the lake have changed with modern population growth in the watershed because of the limited water quality data record. To better manage and restore water quality and ecosystem function it is important to understand the timing and magnitude of phosphorus concentration changes in lakes. Because standard methods for reconstructing phosphorus in sediment cores is difficult and imprecise, we tested two novel approaches to measuring lake phosphorus history in one of four sediment cores collected from disparate regions of the lake. Both methods isolate calcium carbonate precipitates to measure co-precipitated phosphorus at intervals throughout the sediment cores. In addition, we performed a more established sequential phosphorus fractionation scheme on all cores. Sequential phosphorus fractionation analysis of four sediment cores taken from Utah Lake supports our hypothesis that P concentrations have increased across the water column in recent centuries. We find the Goshen Bay CaCO3-P profile to be the most useful, in part because it reflects a region of the lake from which harmful algal blooms historically. In this series, the CaCO3-P fraction of sediments increases by about 100%, corresponding with the timing of modern human activity in the watershed. The degree of P increases up-core vary spatially across coring sites. Possible reasons for the differences between coring locations might include proximity to population centers, susceptibility to disturbance by common carp, and lake level or climate effects. Because of the loss of historical macrophyte communities corresponding with population growth and anthropogenic disturbances, Provo Bay and Goshen Bay were most susceptible to localized disturbance in P cycling. These results demonstrate the effectiveness of analyzing phosphorus in authigenic calcite as a record of historical lake phosphorus concentrations.

ISBN: 9798209994473Subjects--Topical Terms:

794747
Water resources management.
Subjects--Index Terms:

Alkaline lake

Comparing Multiple Approaches to Reconstructing the Phosphorus History of Marl Lakes: A Utah Lake Case Study.
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245 1 0 $a Comparing Multiple Approaches to Reconstructing the Phosphorus History of Marl Lakes: A Utah Lake Case Study.
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300 $a 62 p.
500 $a Source: Masters Abstracts International, Volume: 83-10.
500 $a Advisor: Brahney, Janice.
502 $a Thesis (M.S.)--Utah State University, 2022.
506 $a This item must not be sold to any third party vendors.
520 $a Cultural eutrophication driven by excess phosphorus loading is among the greatest threats to freshwater lakes globally. Utah Lake in central Utah, USA is an example of a lake increasingly experiencing cyanobacterial blooms, which are likely a product of cultural eutrophication in recent decades. However, there is uncertainty about how phosphorus loading and concentrations in the lake have changed with modern population growth in the watershed because of the limited water quality data record. To better manage and restore water quality and ecosystem function it is important to understand the timing and magnitude of phosphorus concentration changes in lakes. Because standard methods for reconstructing phosphorus in sediment cores is difficult and imprecise, we tested two novel approaches to measuring lake phosphorus history in one of four sediment cores collected from disparate regions of the lake. Both methods isolate calcium carbonate precipitates to measure co-precipitated phosphorus at intervals throughout the sediment cores. In addition, we performed a more established sequential phosphorus fractionation scheme on all cores. Sequential phosphorus fractionation analysis of four sediment cores taken from Utah Lake supports our hypothesis that P concentrations have increased across the water column in recent centuries. We find the Goshen Bay CaCO3-P profile to be the most useful, in part because it reflects a region of the lake from which harmful algal blooms historically. In this series, the CaCO3-P fraction of sediments increases by about 100%, corresponding with the timing of modern human activity in the watershed. The degree of P increases up-core vary spatially across coring sites. Possible reasons for the differences between coring locations might include proximity to population centers, susceptibility to disturbance by common carp, and lake level or climate effects. Because of the loss of historical macrophyte communities corresponding with population growth and anthropogenic disturbances, Provo Bay and Goshen Bay were most susceptible to localized disturbance in P cycling. These results demonstrate the effectiveness of analyzing phosphorus in authigenic calcite as a record of historical lake phosphorus concentrations.
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653 $a Cultural eutrophication
653 $a Nutrient pollution
653 $a Phosphorus
653 $a Utah Lake
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690 $a 0775
710 2 $a Utah State University. $b Watershed Sciences (WATS). $3 1277400
773 0 $t Masters Abstracts International $g 83-10.
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791 $a M.S.
792 $a 2022
793 $a English
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