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1999 Proposal
Project Proposal for 1999
Project title: A Proposal for Synthesis by the Aquatic Cycling Of Mercury in the Everglades Project
Geographic area: WCA1, WCA2, WCA3, Everglades National Park, and the ENR Area
Project start date: October 1, 1998
Project end date: September 30,2000
Project chief: David P Krabbenhoft
Region/Division/Team/Section: NR, WRD, Wisconsin District Office,
Mercury Studies Team
Email: dpkrabbe@usgs.gov
Phone: 608-821-3843
Fax: 608-821-3817
Mail address: USGS-WRD, 8505 Research Way, Middleton, WI 53562
Program(s): INATURES Program
Program element(s)/task(s) and percent time commitment to each task:
Element 4: Regional Mercury, Geochemnistry and Water Quality Assessment
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Task 4.1 (70%) Chemical and biochemical controls of mercury transformation,
speciation, transport, storage and bioavailability in the Everglades.
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Task 42 (2%) Geochemical processes and in organic rich sediment nutrients,
history and diagenesis.
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Task 4.3 (2%) Microbial mercury degradation in the south Florida Ecosystem.
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Task 4.4 (10%) Interactions of Hg and DOC in the Everglades.
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Task 4.5 (10%) Mercury Cycling in the Everglades and the Everglades Nutrient
Removal (ENR) Areas
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Task 4.6 (6%)-Groundwater/surface-water interactions.
BACKGROUND NARRATTVES
Project summary: The toxicological manifestation of mercury
contamination varies widely among ecosystems; some ecosystems show little
transference of mercury to the food web (bioaccumulation), while others
show efficient transfer into living organisms. Such is the case with the
Florida Everglades. For the past three years, the Aquatic Cycling of Mercury
in the Everglades (ACME) project has been investigating the factors controlling
mercury cycling and bioaccumulation. The objective this proposed work is
to bring to fruition the research conducted by the ACME project. Products
from the synthesis (databases, scientific papers, overall synthesis document)
will be valuable for State of Florida managers who are currently making
restoration design decisions. In addition, because mercury is globally
distributed, our results will be transferable worldwide to other scientists
and ecosystem managers.
Project objectives and strategy: The Aquatic Cycling of Mercury
in the Everglades (ACME) project was originally designed to examine the
reasons behind the observed high levels of mercury in predatory fish across
most at the Everglades, and to do so by focusing on fundamental biogeochemical
processes. The overall goal of the ACME project was to provide information
that would be useful to state and federal management agencies responsible
for making Everglades restoration plans, and to hopefully include strategies
for reducing mercury toxicity to this fragile ecosystem. Originally, the
scientific breadth of the ACME project was limited to critical areas of
study central to the mercury contamination issue. After initiation of field
studies in 1995, however, substantial information gaps in many basic areas
of ecosystem research were revealed for the Everglades (e.g,, hydrology,
microbiology! and food web studies). As a result, the scope of our effort
was expanded to what now is a more complete, general study of biogeochemistry
of the Everglades ecosystem. In addition, our geographic coverage was expanded
from original plans that called for focusing on just the northern Water
Conservation areas, to now, where we sample a complete north-to-south transect
of the remaining Everglades (Loxahatchee National Wildlife Refuge to Taylor
Slough).
ACME study results to date have resulted in four refereed journal papers
(with four others currently either submitted or in preparation stages)
and many presentations at national and international meetings (see ACME
Project Bibliography). While these products have provided a start toward
our synthesis goals, most of our major research findings will be produced
under this proposed synthesis effort. We will accomplish our synthesis
goals by three principal means: (1) coalescing and uploading project data
to the Web via a data server, (2) preparation and publication of manuscripts
in high-quality, peer-reviewed journals, and (3) preparation and publication
of a overall project synthesis document that brings together all of the
scientific highlights of the ACME publications in to a uniform conceptual
model/framework, and that is presented in a fashion that will be useful
to ecosystem managers. Each of these synthesis activities is discussed
in more detail below. To help catalyze the manuscript production process
we propose to have a project meeting early in FY99. Each primary investigator
would come to the meeting with a series of proposed manuscripts, complete
with authors, titles and an outline. Manuscript working groups would be
formed at the meeting to produce extended outlines for each manuscript.
Dave Krabbenhoft will assume lead responsibility for coordinating the synthesis
phase of the ACME project, although the ultimate success of this effort
will depend on the self-motivation and desire of all Principal Investigators
to fully engage and commit themselves to this activity. Details of each
of the three main synthesis activities arc given below.
1. Web Enabled Data Base: Most of the data collected on mercury
in water during the past 3.5 years is already uploaded onto a data server
located in the Wisconsin District Office. An OracleTM
interface is already operational for providing data over the Internet (http://oraddwimdn.er.usgs.gov/ows-bin/owa/mercury.info),
and will be "fine tuned' and improved with graphics during the summer of
1998. By the end of FY98, all of the aqueous mercury data will be included
into this data base and available to the public. Some of the original data
would be inappropriate or difficult to upload, such as experimental results
to determine process rate coefficients. In those cases, figures or charts
that present experimental results that could be useful to others will be
included on the Web site. The Web server will have a SEQL-based, user-friendly,
graphical interface that will contain "hot keys" that will provide general
project information, site maps, listings of project products, site photographs,
as well as links to the main INATURES Program web site and the South Florida
INATURES site.
2. Journal Paper Production: Each of ACME Principal Investigators
will be expected to draft, acquire approval, submit and get published 1
to 4 journal papers during the synthesis period. The project leader has
encouraged all of the Principal Investigators to begin drafting manuscripts
immediately, rather than waiting for the formal synthesis year. We will
target high quality journals such as Environmental Science and Technology,
Environmental Chemistry and Toxicology, Limnology and Oceanography, Geochemica
Cosmochemica Acta, Chemical Geology, Hydrologic Processes, and Biogeochemistry.
The Editor of Hydrologic Processes has already been consulted about the
possibility of submitting a compendium of papers from the ACME project,
and having them be published as a dedicated volume of that journal. This
inquiry was very well received by the Editor, and the possibility of the
ACME team taking this publication approach will be discussed as a group
following the June, 1998 field trip. Each of these papers will focus on
specific aspects of each of the Principal Investigator's research programs.
It is expected that many of these papers will not focus on mercury per
se, and several of them may not mention mercury at all. For example, a
team of authors has already been assembled to being the process of drafting
a paper addressing the redox status of Everglade's sediments, a very important
research finding from ACME, but not necessarily tied to mercury cycling.
3. Preparation of Overall Synthesis Document: There are many
target audiences for our data and interpretations. Ecosystem managers are
more likely to be interested in knowing how all our individual results
tie together into a coherent and consistent conceptual framework and what
implications they have for restoration plans. Essentially this will entail
the coalescing of all of the individual papers produced under item 2 above,
as well as any other information previously published or not included in
those papers but useful for the document. In addition, other related work
such as mercury toxicity testing on avian populations from the everglades
that is now underway at the Patuxent Wildlife Center will be included in
this document. The anticipated outlet will be a USGS Circular (or similar
publication series) that will allow for a flexible presentation of ACME
research to date and include colorful graphics and photographs. Individual
chapters will be short and concise (3-5 printed pages). An outline for
this document follows. [A suggested lead author is indicated, although
it is anticipated that all the chapters will have multiple authors]
The Aquatic Cycling of Mercury in the Everglades (ACME) Project; A Biogeochemical
Assessment of the Florida Everglade Ecosystem
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Introductory materials including of why the project was initiated, project
goals, interagency collaboration, and a brief description of the Everglades
ecosystem and history. (Krabbenhoft)
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Hydrogeological setting and groundwater-surface water interactions in the
Everglades ecosystem. (Harvey)
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Cycling of sulfur and nutrients in the Everglades ecosystem. (Orem)
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Sedimentary diagenesis in the Everglades ecosystem. (Orem)
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General porewater chemistry in the Everglades ecosystem. (Reddy)
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Sedimentary redox chemistry in the Everglades ecosystem. (Schuster)
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DOC importance, generation, and evolution in the Everglades ecosystem;
Is this the Everglades master variable? (Aiken)
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Mercury in surface waters of the Everglades ecosystem. (Burley)
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Mercury methylation in the Everglades ecosystem. (Gilmour)
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Methylmercury degradation in the Everglades ecosystem. (Marvin- Dipasquale)
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Humic substances-Hg interactions: controls on levels, speciation, and transport
(King)
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Photo-chemistry of mercury in the Everglades ecosystem. (Krabbenhoft)
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Analytical challenges of Everglades waters for mercury analysis. (Olson)
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Pigments as diagnostic indicators/descriptors of periphyton in the Everglades.
(Hurley)
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Delineation of the Everglades ecosystem food webs; the stable isotope approach
(Kendall)
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Bioaccumulation of mercury in lower tropic levels of Everglades ecosystem.
(Cleckner)
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Bioaccumulation of mercury in predatory fish of the Everglades ecosystem.
(Lange).
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Toxicological Effects of Mercury on Wading Birds from the Everglades (Heinz,
Patuxent Wildlife Center)
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The Everglades Mercury Cycling Model. (Harris)
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Summary (All)
Potential impacts and major products: Our scientific results
have already had many impacts on the general scientific community, including
several novel contributions toward the understanding of mercury in the
environment.
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A demonstration of significant diel changes in mercury phase and species
shifts that occur reproducibly on a diel basis.
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A demonstration that floating and attached periphyton can methylate mercury,
and likely serves as a primary entry point of mercury to the food web.
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Through the use of pigment (major and ancillary) analysis, determination
of what microbial communities promote mercury methylation in periphyton,
and also a more general description of the microbial ecology of Everglade's
periphyton that was heretofore not known.
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Demonstrated case of where too much available sulfate can lead to excessive
sulfide levels that drive the separation of mercury toward an anionic form
(HgS22) that is not available for methylation. This
finding has profound impacts on our understanding as to why the eutrophied
areas of the Everglades exhibit reduced levels of bioaccumulation than
more pristine areas.
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We have published an analytical improvement paper on the effects of high
sulfide levels, and its interference effects on methylmercury determinations.
This effect was heretofore unknown.
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Demonstration of dual microbial methylmercury degradation pathways (oxidative
and reductive) that is largely mediated by the same microbes that methylate
mercury (sulfate reducing bacteria). In addition, the microbial demethylation
studies have greatly improved existing methodological assays by conducting
measurements at near ambient methylmercury levels.
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Demonstration of photochemical degradation of mercury by photolysis, which
was previously unknown in the Everglades ecosystem.
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Demonstration of micro-chemical stratification of the marshes in the Everglades.
These results have widespread impacts on how managers and other scientists
must view the Everglades from a conceptual model standpoint, as well as
what regulates the overall biogeochemistry of the Everglades. Many previous
investigators would have preferred to view the ecosystem as a wide, slow
moving river; whereas our findings would suggest that from a biogeochemical
perspective, a vertically-oriented, stratified-marsh model is more appropriate,
similar to a stratified lake.
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Previous to the ACME project, existing wisdom held that Everglade's sediments
were oxic (so called sweet peat). We have successfully demonstrated that
in fact these sediments are at most oxic in micro zones around roots, but
primarily anoxic and the dominating biogeochemical process are anoxic.
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Many previous studies involving mercury have shown correlative responses
of mercury and DOC in natural systems. The ACME project has substantially
improved our level of understanding of the fundamental chemical reasons
for these observations.
From a management perspective, results from the ACME project have and
will play a major role in making restoration decisions for the Everglades.
Important contributions include:
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A reliable data base of mercury concentrations in air, water, sediment,
biota collected over a 3.5 year petiod that will serve as a baseline for
future studies and upon which target legislation can be based. For example,
TMDL standards are currently being deliberated and, for mercury at least,
provide a direct link to existing and proposed Clean Air Act Laws. Law
makers need to consider the fact that with the existing levels of mercury
arriving to the Everglades via atmospheric pathways, all game fish in the
ACME field area are above the human consumption advisory limit for mercury.
This poses the question of "what is an allowable air emission load of mercury
in south Florida?"
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As mandated by the Florida Everglades Forever Act, by December 31, 1998,
the South Florida Water Management District must provide a report to the
Florida Legislature on the status and current understanding of the mercury
problem in the Everglades. By December 31, 1999, recommendations of what
to do about the problem must be made to the Legislature. ACME data will
provide the basis of much of what will be included in these reports.
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The US Army Corps of Engineers is currently designing the restoration plan
for south Florida, and one consideration they and other agencies must consider
is what effect these alterations will have on mercury toxicity. Data and
reports from the ACME project will play a fundamental role in making recommendations
to the Corps and how they can mitigate mercury toxicity impacts.
Collaborators, clients: Internal collaborators and participants
on the proposed synthesis phase of the ACME project and external clients
of the synthesis are listed in Tables 1 and 2 respectively.
Table 1. Internal Collaborators and anticipated synthesis participants for the AMCE project
Collaborator | Affiliation | Areas of Study |
George Aiken | USGS, WRD, Boulder, CO | DOC chemistry-Hg interactions |
Lisa Cleckner | Univ. of Wisconsin, Madison | Bioaccumulation of Hg |
Cindy Cleckner | Academy of Natural Sciences | Mercury methylation |
Reed Harris | Tetra Tech, Inc. | Hg cycling model |
Gary Heinz | USGS, BRD, Patuxant Center | Toxicity studies in wildlife |
Jud Harvey | USGS, WRD, Reston, VA | GW-SW interactions |
Jim Hurley | Wisc. DNR, Madison,WI | Hg chemistry and pigments |
Carol Kendall | USGS, WRD, Menlo Park, CA | Stable isotopes and food webs |
Sue King | Univ. of Wisconsin, Madison | Humics and Hg/MeHg |
David Krabbenhoft | USGS, WRD, Madison, WI | Aqueous Hg chemistry |
Mark Marvin-Dipasquale | USGS, WRD, Menlo Park, CA | Hg demethylation |
Mark Olson | USGS, WRD, Madison, WI | Hg analysis of Everglades waters |
Bill Orem | USGS, GD, Reston, VA | S cycle, nutrients and diagenesis |
Ted Lange | Florida Game and Fish Comm. | Bioaccumulation of Hg |
Michael Reddy | USGS, WRD, Boulder, CO | Modeling DOC-Hg interactions |
Paul Schuster | USGS, WRD, Boulder, CO | Redox/porewater chemistry |
Table 2. External Clients of the ACME project.
Collaborator | Affiliation | Management Responsibility |
Sarah Gerould | USGS, Reston, VA | INATURES Prog. Manager |
Aaron Higer | USGS, W. Palm Beach, FL | S. Florida Ecosystem Prog. Mgr. |
Larry Fink | S. Florida Water Mgt. District | SFWMD Mercury Program |
Tom Atkeson | Florida Dpt. of Environ. Prot. | FDEP Mercury Coordinator |
Richard Punnet | US Army Corps Engineers | Re-study Coordinator |
Richard Harvey | USEPA | S. Florida Prog. Manager |
The Interagency Working Group | Multiple agencies | Scientific and managerial decisions
of government scientific activities |
John and Jane Doe | US Citizen | Concerns for Fish Contamination |
WORK PLAN
Overall: See Objectives and Strategy section above.
Time line: FY 1999 to project end):
| Fiscal Year-Quarter |
Task | FY98-3 | FY98-4 | FY99-1 | FY99-2 | FY99-3 | FY99-4 | FY00-1 | FY00-2 | FY00-3 | FY00-4 |
Web site data enable | ** | ** | ** | | | | | | | |
Individual Journal Papers | | ** | ** | ** | ** | ** | ** | | | |
ACME Circular | | | ** | ** | ** | ** | ** | ** | ** | |
Deliverables/products: See Objectives and Strategy section above.
Outreach activities: Over the past 3.5 years, ACME project investigators
have been regular attendees at a variety of interagency and scientific
meetings. Dave Krabbenhoft is a sitting member of the South Florida Mercury
Science Program Committee and attends their biannual meetings on behalf
of ACME. The SFWMD and FDEP annually host a Mercury Program Peer Review
meeting, where typically 10-12 technical presentations (about 50% of the
total program) are made by ACME investigators. We have been active at scientific
meetings throughout the history of our project and anticipate keeping the
commitment to get our scientific finding out quickly to our peers by attending
two national meetings during this proposed synthesis period.
PROJECT SUPPORT REQUIREMENTS
Names and expertise of key project staff: Staffing requirements
requested here only include those activities centered out of the Wisconsin
District Office.
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Dave Krabbenhoft, (75%) Geochemistry, FY99, FY00
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Jim Hurley, (50%) Chemistry. Senior Scientist, Wisc. DNR no charge to USGS,
FY99 & FY00
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Lisa Cleckner, (80%) Univ. of Wisc. Postdoc., FY99
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Sue King, (70%) Geochemistry, [Sue's salary has been funded for first three
years of project by a NSF proposal co-written by USGS and U. of Wisconsin,
request funding for Sue to finish writing thesis and participate in synthesis]
FY99
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Paul Garrison, Research Scientist, WDNR (20%) no charge to USGS, FY99
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Mark Olson, (25%) Data verification, analytical methods development1 and
sample analyst, FY99
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John Dewild, (25%) Sample analyst, FY99
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Harty House, (4.5%) Web data base facilitator, FY99
Major equipment/facility needs (list by fiscal year for duration
of project): Request a new PC for synthesis leader to better facilitate
manuscript production and data base distribution. Currently using a 5 year
old 486 PC.
ACME Project Bibliography
Papers:
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Krabbenhoft, D.P. Mercury Studies in the Florida Everglades, 1996, U.S.
Geological Survey Fact Sheet, P5-166-96 (4 p).
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Krabbenhoft, D.P., and Others, The South Florida Mercury Science Program,
1997 Florida Department of Environmental Protection Fact Sheet.
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Krabbenhoft, D.P., J.P. Haley, M.L. Olson and L.B. Cleckner, 1998, Diel
variability of mercury phase and species distributions in the Florida Everglades.Biogeochemistry,
40, pp. 311425.
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Hurley, J.P., D.P. Krabbenhoft, L.B Cleckner, M.L. Olson, G. Aiken, and
P.J. Rawlik, 1998, System controls on aqueous mercury distribution in the
northern Everglades. Biogeochemistry, 40, pp. 293-310.
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Cleckner, L.B. P.J. Garrison, J.P. Harley, M.L. Olson and D.P. Krabbenhoft,
1998. Trophic transfer of methylmercury in the northern Everglades, Biogeochemistry,
pp. 347-361
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Olson, M.L., L.B. Cleckner, [J.P. Hurley, D.P. Krabbenhoft, and T.W. Heelan,
1998, Resolution of matrix effects on analysis of total and methyl mercury
in aqueous samples from the Florida Everglades, Fresenius J. Analytical
Chemistry, 358, p. 392-396.
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Gilmour, CC., G.A. Gill, M.C. Stordal and E. Spiker, 1998, Mercury methylation
and sulfur cycling in the Northern Everglades. Biogeochemistry, pp. 326-346.
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M. Marvin-DiPasquale and R.S. Oremland, 1998, Bacterial Methylmercury Degradation
in Florida Everglades Sediment and Periphyton, (manuscript submitted to
Environmental Science and Technology)
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Cleckner, L.B., C.C Gilinour, J.P. Hurley, and D.P. Krabbenhoft, 1998,
Mercury Methylation by Periphyton in the Florida Everglades, (manuscript
submitted to Limnology and Oceanography)
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Ravichandran, M. G.R. Aiken, M.M. Reddy, and J.N. Ryan, Enhanced Dissolution of Cinnabar (Mercuric Sulfide) by Organic Matter from the Florida Everglades,
(manuscript submitted to Environmental Science and Technology).
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Orem W.H., H.E. Lerch, and P. Rawlik, 1997, Geochemistry of surface
and pore water at USGS coring sites in wetlands of south Florida. USGS
Open-File Report 97-454, 55pp.
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Bates A.L., E.C. Spiker, and C.W. Holmes, 1998, Speciation and isotopic
composition of sedimentary sulfur in the Everglades Water Conservation
Area 2A. Florida, USA. Chemical Geology, in press.
Abstracts:
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Krabbenhoft., D.P., J.P. Hurley, M.L. Olson, and L.B. Cleckner, 1996,
Mercury transformation processes in the Everglades: temporal variations
in mercury phase and species distribution and controlled exposure experiments,
(abs) Proceedings of the Fourth International Conference on Mercury as
a Global Pollutant, August 4-8, 1996, Hamburg, Germany.
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Olson, M.L., D.P. Krabbenhoft, L.B. Cleckner, and J.P. Hurley, 1996,
Resolution of matrix effects on analysis of total and methyl mercury in
aqueous samples from the Florida Everglades, (abs) Proceedings of the Fourth
International Conference on Mercury as a Global Pollutant, August 4-8,
1996, Hamburg, Germany.
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Hurley, J.P., D.P. Krabbenhoft, G. Aiken, M.L. Olson, and L.B. Cleckner,
1996, System controls on water column total and methyl mercury in the northern Everglades(abs) Proceedings of the Fourth International Conference
on Mercury as a Global Pollutant, August 4-8, 1996, Hamburg, Germany.
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Cleckner, L.B., P.J. Garrison, J.E. Hurley, D.P. Krabbenhoft, M.L.
Olson, and T. Heelen, Relations between water chemistry and trophic transfer
of mercury in the northern Everglades, (abs) Proceedings of the Fourth
International Conference on Mercury as a Global Pollutant, August 4-8,
1996, Hamburg, Germany
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King, S.A., C.J. Miles, D.P. Krabbenhoft, J.P. Hurley, and L.A. Fink,
1997, Mercury studies in the Everglades Nutrient Removal Area, (abs), Proceedings
of the Fourth International Conference on Mercury as a Global Pollutant,
August 4-8, 1996, Hamburg, Germany.
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Krabbenhoft, D.P., J.P. Hurley, M.L. Olson, and L.B. Cleckner, 1996,
Sunlight-induced, temporal variations in mercury phase and species distributions
in the marshes of the Florida Everglades, (abs) American Chemical Society,
national meeting, Program with Abstracts, Orlando. FL, August 23-28, 1996.
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Hurley, J.P., D.P. Krabbenhoft, L.B. Cleckner, S.A. King and M.L. Olson,
1996, System controls on the aqueous mercury distribution in the northern
Everglades, (abs)American Chemical Society, national meeting, Program with Abstracts,
Orlando, FL, August 23-28, 1996.
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Cleckner, L.B., P.J. Garrison, J.P. Hurley, D.P. Krabbenhoft, M.L.
Olson, and T. Heelen, 1996, Relations between water chemistry and trophic
transfer of mercury in the northern Everglades, (abs) American Chemical
Society, national meeting, Program with Abstracs, Orlando, FL, August 23-28,
1996.
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Krabbenhoft, D.P., J.P. Hurley, M.L. Olson, and L.B. Cleckner, 1997,
The aquatic cycling of mercury in the Everglades (ACME) project: Results
from the first two years of study, (abs), American Society of Limnology
and Oceanography, national meeting, Santa Fe, NM, February 10-14, 1997.
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Cleckner, L.B., J.P. Hurley and P.J. Garrison, D.P. Krabbenhoft and
M.L. Olson, 1997, The role of periphyton in mercury bioaccumulation in the
Florida Everglades, (abs), American Society of Limnology and Oceanography,
national meeting, Santa Fe, NM, February 10-14. 1997.
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Gilmour, C.C., G.A. Gill, M.C. Stordal and E. Spiker, 1997, Controls
on mercury methylation in the Northern Everglades, (abs) American Society
of Limnology and Oceanography, national meeting, Santa Fe, NM, February
10-14, 1997.
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Krabbenhoft, D.P, Hurley, J.P., M.L. Olson, and L.B. Cleckner, 1997,
System controls on the aqueous mercury distribution in the northern Everglades,
in U.S Geological Survey Program on the South Florida Ecosystem - Proceedings
of the Technical Symposium in Ft. Lauderdale, Florida, August 25-27, 1997;
U.S. Geological Survey Open-File Report 97-385, p. 62-63.
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Krabbenhoft, D.P, Hurley, J.P., M.L. Olson, and L.B. Cleckner, 1997,
Mercury transformation processes in the Everglades: Temporal variations
in mercury phase and species distributions and controlled exposure experiments,
(abs) in U.S. Geological Survey Program on the South Florida Ecosystem
- Proceedings of the Technical Symposium in Ft. Lauderdale, Florida, August
25-27, 1997; US.. Geological Survey Open-File Report 97-385, p. 63-64.
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Cleckner, L.B., J.P. Hurley and P.J. Garrison, D.P. Krabbenhoft and
M.L. Olson, 1997, The role of periphyton in mercury bioaccumulation in the Florida
Everglades.(abs), in U.S. Geological Survey Program on the South Florida Ecosystem
- Proceedings of the Technical Symposium in Ft. Lauderdale, Florida,
August 25-27, 1997; U.S. Geological Survey Open-File Report 97-385, p. 64-65.
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Olson, M.L., D.P. Krabbenhoft, L.B. Cleckner, and J.P. Hurley, 1996,
Resolution of matrix effects on analysis of total and methyl mercury in
aqueous samples from the Florida Everglades, (abs), in U.S. Geological
Survey Program on the South Florida Ecosystem - Proceedings of the Technical
Symposium in Ft. Lauderdale, Florida, August 25-27, 1997; U.S. Geological
Survey Open-File Report 97-385, p. 65-66.
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Hurley, J.P., D.P. Krabbenhoft, P. Schuster, L.B. Cleckner, M.L.
Olson, and G.R. Aiken, 1998, Development of a Conceptual Model of the Everglades Mercury
Cycle: Results from Did Smdies, EOS, Transactions, American Geophysical Union,
1998 Spring Meeting, Program and Abstracts, May 26-29, Boston, MA.
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Krabbenhoft, D.P., Hurley. J.P., Aiken, G.R., Olson, M.L., Dewild,
J.F., Cleckner, L.B., Grimshaw, J., Lindberg, S., 1998, The Influence of
Photochemical Processes on the Everglades Mercury Cycle., EOS, Transactions,
American Geophysical Union, 1998 Spring Meeting, Program and Abstracts,
May 26-29, Boston, MA.
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Hurley, J.P., 1998, Chlorophyll and Carotenoid Pigments as Indicators
of Algal and Phototrophic Bacterial Distributions in The Florida Everglades, EOS, Transactions, American Geophysical Union, 1998 Spring Meeting, Program and Abstracts, May 26-29, Boston, MA.
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Cleckner, L.B., C.C. Gilmour, J.P. Hurley, and D.P. Krabbenhoft, 1998.
Mercury Methylation by Periphyton in the Florida Everglades, EOS, Transactions,
American Geophysical Union, 1998 Spring Meeting. Program and Abstracts,
May 26-29, Boston, MA.
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Heyes, A., C.C. Gilmour and J.M. Benoit, 1998, Controls on the Distribution
of Methylmercury in the Florida Everglades. EOS, Transactions, American
Geophysical Union, 1998 Spring Meeting, Program and Abstracts, May 26-29,
Boston, MA.
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Harvey, J.W., St. Krupa, R.H. Mooney, P.F. and Schuster, 1998, Are
Groundwater and Surface Water in the Northern Everglades Connected By Vertical
Hydrologic Fluxes Through Peat?, EOS, Transactions, American Geophysical Union,
1998 Spring Meeting, Program and Abstracts, May 26-29, Boston, MA.
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Kendall, C., S. Silva, Q.J. Stober, and P. Meyer. 1998, Mapping
Spatial Variability in Marsh Redox Conditions in the Florida Everglades Using Biomass Stable
Isotopic Compositions, EOS, Transactions, American Geophysical Union, 1998 Spring Meeting, Program and Abstracts, May 26-29, Boston, MA.
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Schuster P., M.M. Reddy, G.R. Aiken, J.P. Hurley, and D.P. Krabbenhoft,
1998, Diel Sulfide and Dissolved Oxygen Concentration Gradients at Two Sites
in the Everglades, EOS, Transactions, American Geophysical Union, 1998
Spring Meeting, Program and Abstracts, May 26-29, Boston, MA.
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from the Florida Everglades, EOS, Transactions, American Geophysical Union,
1998 Spring Meeting, Program and Abstracts, May 26-29, Boston, MA.
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Reddy, M.M. and G.R. Aiken, 1998, Speciation and Fractionation Modeling
Studies -Dissolved Organic Carbon (DOC)-Mercury Interaction, EOS, Transactions,
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Marvin-DiPasquale, M. and R.S. Oremland, 1998, Bacterial Methylmercury
Degradation in Florida Everglades Sediment and Periphyton, EOS. Transactions,
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Aiken, G.R., and M.M. Reddy, 1998, Dissolved Organic Carbon in the
Everglades, Florida, EOS. Transactions, American Geophysical Union, 1998
Spring Meeting, Program and Abstracts, May 26-29, Boston, MA.
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Hoch, A.R., M.M. Reddy, and G.R. Aiken, 1998, Inhibition of Calcite
Growth by Natural Organic Material From the Florida Everglades at pH =
8.5 and 25 degrees C, EOS, Transactions, American Geophysical Union, 1998
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Orem, W.H., H.E. Lerch, M. Corum, A. Boylan, and C. Hedgman. 1998,
Phosphorus Geochemistry of the South Florida Wetlands Ecosystem: Sources and Biogeochemical Cycling, EOS, Transactions, American Geophysical Union,
1998 Spring Meeting, Program and Abstracts, May 26-29, Boston, MA.
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Bates, A.L., W.H. Orem. and J.W. Harvey, 1998, Tracing Sources of
Sulfate in the Northern Everglades Using Sulfur Isotopic Compositions, 1998, EOS,
Transactions, American Geophysical Union, 1998 Spring Meeting, Program and Abstracts,
May 26-29, Boston, MA.
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Bates A.L., and E.C. Spiker (1994) Speciation and isotopic composition
of sedimentary sulfur in the Florida Everglades [abs.]. American Chemical
Society National Meeting, Washington, D.C. August 1994.
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Orem W.H. and H.E. Lerch (1996) Diagenesis and cycling of C,N,P,
and S in Everglades peat [abs.]. American Chemical Society National Meeting,
Orlando, FL, August 1996.
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Bates A.L. and E.C. Spiker (1996) Sulfur geochemistry and nutrient
enrichment in the Florida Everglades (abs.]. American Chemical Society
National Meeting, Orlando, FL, August 1996.
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Orem W.H., A.L. Bates, A.T. Boylan, M. Corum, C. Hedgman, H.E. Lerch,
and R.A. Zielinski, 1997, Biogeochemical cycling of P,S,C, and N in sediments
from wetlands of south Florida (abs.]. USGS Program on the South Florida
Ecosystem-Proceedings, USGS Open-File Report 97-385, p. 64-65.
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