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Multidimensional Tracing of Mercury ...

Lepak, Ryan F.

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Multidimensional Tracing of Mercury Sources and Bioaccumulation Pathways Using Stable Isotopic Analyses.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Multidimensional Tracing of Mercury Sources and Bioaccumulation Pathways Using Stable Isotopic Analyses./
Author:	Lepak, Ryan F.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
Description:	270 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
Contained By:	Dissertations Abstracts International80-02B.
Subject:	Analytical chemistry. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10928222
ISBN:	9780438272439

Multidimensional Tracing of Mercury Sources and Bioaccumulation Pathways Using Stable Isotopic Analyses.
Lepak, Ryan F.

Multidimensional Tracing of Mercury Sources and Bioaccumulation Pathways Using Stable Isotopic Analyses. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 270 p.

Source: Dissertations Abstracts International, Volume: 80-02, Section: B.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2018.

This item must not be added to any third party search indexes.

Recent advancements in utilizing high precision isotope analysis allows us to trace sources of mercury (Hg) and processes it undergoes without the need of enriched isotope amendment. Here, we use total mercury (HgT) stable isotope ratios in fish, the lower food web, particulate matter, and water to unravel the linkages between bioaccumulation of MeHg and sources of Hg to fish from the Great Lakes and remote Alaska. Through the combination of multiple traditional Hg measurements and Hg stable isotopes, we identify sources of Hg to biota, but also quantify the impact of variables (such as dissolved MeHg concentrations, distribution coefficients, fish age) often absent in Hg isotope studies. This knowledge is critical to interpreting challenging fractionation patterns in fish. In choosing ecosystems absent of point source contamination, we are able to explore background conditions and infer novel processes (e.g. water column methylation) previously unrecognized by applying sensitive isotopic tracers (e.g. Δ200Hg). We studied ecosystems absent of significant sedimentary MeHg fluxes, and find evidence contrary to the assumption that sediments accurately predict Hg sources to fish. To do so, we use carefully chosen ecosystems and employ the use of intensive water column profiling. With the first use of a biological archive, using Hg stable isotope analysis we probed the impact of Hg mitigation strategies on both sediments and fish, and find that fish respond to Hg mitigation much more rapidly than previously recognized. This, paired with the first lower food web exploration using Hg stable isotopes, supports the notion that sediment Hg and fish Hg concentrations are decoupled. Recently deposited atmospherically-sourced Hg is shown to be highly bioavailable, and fish respond rapidly to perturbations to atmospherically-sourced Hg. Finally, energy pathways (source C, N and diets) are important for accurately interpret Hg source pathways and provides corroborating results to go along with the Hg isotope results. These tracers allow us to expand our understanding of bioaccumulative Hg pathways to biota. Together, multi-isotope tracing allows us for differentiation between changing Hg-source portfolios in biota and shifting diets in fish, information highly important to resource managers.

ISBN: 9780438272439Subjects--Topical Terms:

3168300
Analytical chemistry.
Subjects--Index Terms:

Bioaccumulation

Multidimensional Tracing of Mercury Sources and Bioaccumulation Pathways Using Stable Isotopic Analyses.
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245 1 0 $a Multidimensional Tracing of Mercury Sources and Bioaccumulation Pathways Using Stable Isotopic Analyses.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2018
300 $a 270 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-02, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Hurley, James P.
502 $a Thesis (Ph.D.)--The University of Wisconsin - Madison, 2018.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Recent advancements in utilizing high precision isotope analysis allows us to trace sources of mercury (Hg) and processes it undergoes without the need of enriched isotope amendment. Here, we use total mercury (HgT) stable isotope ratios in fish, the lower food web, particulate matter, and water to unravel the linkages between bioaccumulation of MeHg and sources of Hg to fish from the Great Lakes and remote Alaska. Through the combination of multiple traditional Hg measurements and Hg stable isotopes, we identify sources of Hg to biota, but also quantify the impact of variables (such as dissolved MeHg concentrations, distribution coefficients, fish age) often absent in Hg isotope studies. This knowledge is critical to interpreting challenging fractionation patterns in fish. In choosing ecosystems absent of point source contamination, we are able to explore background conditions and infer novel processes (e.g. water column methylation) previously unrecognized by applying sensitive isotopic tracers (e.g. Δ200Hg). We studied ecosystems absent of significant sedimentary MeHg fluxes, and find evidence contrary to the assumption that sediments accurately predict Hg sources to fish. To do so, we use carefully chosen ecosystems and employ the use of intensive water column profiling. With the first use of a biological archive, using Hg stable isotope analysis we probed the impact of Hg mitigation strategies on both sediments and fish, and find that fish respond to Hg mitigation much more rapidly than previously recognized. This, paired with the first lower food web exploration using Hg stable isotopes, supports the notion that sediment Hg and fish Hg concentrations are decoupled. Recently deposited atmospherically-sourced Hg is shown to be highly bioavailable, and fish respond rapidly to perturbations to atmospherically-sourced Hg. Finally, energy pathways (source C, N and diets) are important for accurately interpret Hg source pathways and provides corroborating results to go along with the Hg isotope results. These tracers allow us to expand our understanding of bioaccumulative Hg pathways to biota. Together, multi-isotope tracing allows us for differentiation between changing Hg-source portfolios in biota and shifting diets in fish, information highly important to resource managers.
590 $a School code: 0262.
650 4 $a Analytical chemistry. $3 3168300
650 4 $a Environmental science. $3 677245
650 4 $a Geochemistry. $3 539092
653 $a Bioaccumulation
653 $a Fish
653 $a Great Lakes
653 $a Isotopes
653 $a Mercury
653 $a Tracer
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690 $a 0768
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710 2 $a The University of Wisconsin - Madison. $b Civil & Environmental Engr. $3 2097812
773 0 $t Dissertations Abstracts International $g 80-02B.
790 $a 0262
791 $a Ph.D.
792 $a 2018
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10928222