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Mark Marvin-DiPasquale

Research Microbiologist

Contact Info

Short Biography

A native of Rochester NY, Dr. Marvin-DiPasquale is Project Chief of the USGS-National Research Program effort "“Biogeochemical Cycling at Regional Scales”. He completed a B.S. in Chemistry at SUNY StonyBrook in 1987, and a Ph.D. in 1995 from University of Maryland, Marine and Estuarine Environmental Science Program, with a focus on the microbial ecology of Chesapeake Bay sediments. He began a career at USGS (Menlo Park, CA) as a ‘National Research Council’ post-doc in 1995, and became a Project Chief in 2004. During much of his USGS tenure, his research focus has been on mercury cycling in various ecosystems, including: the San Francisco Bay watershed and associated mining areas throughout CA; FL Everglades;  Carson River, NV (mercury Superfund site); coastal Louisiana; Pategonia region of Argentina; Puget Sound, WA; USGS-NAWQA and USGS-WEBB Study Units in OR, FL, WI, SC,  NY, CO, GA, PR, and VT.

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Bibliography of Dr. Mark Marvin-DiPasquale (1995-Present)

[by Year and Author]


Alpers, C.N., Fleck, J.A., Marvin-DiPasquale, M., Stricker, C.A., Stephenson, M., and Taylor, H.E., 2014, Mercury cycling in agricultural and managed wetlands, Yolo Bypass, California: Spatial and seasonal variations in water quality: Science of The Total Environment, v. 484, p. 276-287.

Knightes, C.D., Golden, H.E., Journey, C.A., Davis, G.M., Conrads, P.A., Marvin-DiPasquale, M., Brigham, M.E., and Bradley, P.M., 2014, Mercury and Methylmercury Stream Concentrations in a Coastal Plain Watershed: A Multi-Scale Simulation Analysis: Environmental Pollution, v. 187, p. 182-192.

Marvin-DiPasquale, M., Windham-Myers, L., Agee, J.L., Kakouros, E., Kieu, L.H., Fleck, J., Alpers, C.N., and Stricker, C., 2014, Methylmercury production in sediment from agricultural and non-agricultural wetlands in the Yolo Bypass, California: Science of The Total Environment, v. 484, p. 288-299.

Soto Cárdenas, C., Diéguez, M.C., Ribeiro Guevara, S., Marvin-DiPasquale, M., and Queimaliños, C.P., 2014, Incorporation of inorganic mercury (Hg2+) in pelagic food webs of ultraoligotrophic and oligotrophic lakes: The role of different plankton size fractions and species assemblages: Science of The Total Environment, v. 494-495, p. 65-73.

Windham-Myers, L., Fleck, J.A., Ackerman, J.T., Marvin-DiPasquale, M., Stricker, C.A., Heim, W.A., Bachand, P.A., Eagles-Smith, C.A., Gill, G., Stephenson, M., and Alpers, C.N., 2014, Mercury cycling in agricultural and managed wetlands: a synthesis of  methylmercury production, hydrologic export, and bioaccumulation from an integrated field study: Science of The Total Environment, v. 484, p. 221-231.

Windham-Myers, L., Marvin-DiPasquale, M., Stricker, C.A., Agee, J.L., Kieu, L.H., and Kakouros, E., 2014, Mercury cycling in agricultural and managed wetlands of California, USA: Experimental evidence of vegetation-driven changes in sediment biogeochemistry and methylmercury production: Science of The Total Environment, v. 484, p. 300-307.

Windham-Myers, L., Marvin-DiPasquale, M., Kakouros, E., Agee, J.L., Kieu, L.H., Stricker, C.A., Fleck, J.A., and Ackerman, J.T., 2014, Mercury cycling in agricultural and managed wetlands of California, USA - Seasonal influences of vegetation on mercury methylation, storage, and transport: Science of The Total Environment, v. 484, p. 308-318.



Ackerman, J.T., Marvin-DiPasquale, M., Slotton, D., Eagles-Smith, C.A., Herzog, M.P., Hartman, C.A., Agee, J.L., and Ayers, S., 2013, The South Bay Mercury Project: Using Biosentinels to Monitor Effects of Wetland Restoration for the South Bay Salt Pond Restoration Project: Report prepared for the South Bay Salt Pond Restoration Project and Resources Legacy Fund, 227 p., [Link]

Amirbahman, A., Kent, D.B., Curtis, G.P., and Marvin-Dipasquale, M.C., 2013, Kinetics of homogeneous and surface-catalyzed mercury(II) reduction by iron(II): Environmental Science and Technology, v. 47, p. 7204-7213.

Arcagni, M., Campbell, L., Arribére, M.A., Marvin-DiPasquale, M., Rizzo, A., and Ribeiro Guevara, S., 2013, Differential mercury transfer in the aquatic food web of a double basined lake associated with selenium and habitat: Science of The Total Environment, v. 454-455, p. 170-180.

Chalmers, A., Marvin-DiPasquale, M.C., Degnan, J.R., Coles, J., Agee, J.L., and Luce, D., 2013, Characterization of mercury contamination in the Androscoggin River, Coos County, New Hampshire: U.S. Geological Survey Open-File Report 2013-1076, 56 p. [Link]

Diéguez, M.C., Queimaliños, C.P., Ribeiro Guevara, S., Marvin-DiPasquale, M., Soto Cárdenas, C., and Arribére, M.A., 2013, Influence of dissolved organic matter on mercury accumulation by planktonic organisms: An experimental study using oligotrophic water from Patagonian lakes: Journal of Environmental Sciences, v. 25, no. 10, p. 1980-1991.

Windham-Myers, L., Ward, K., Marvin-DiPasquale, M., Agee, J.L., Kieu, L.H., and Kakouros, E., 2013, Biogeochemical Implications of Episodic Impoundment in a Restored Tidal Marsh of San Francisco Bay, California: Restoration Ecology, v. 21, no. 1, p. 124-132.


Bradley, P.M., Journey, C.A., Lowery, M.A., Brigham, M.E., Burns, D.A., Button, D.T., Chapelle, F.H., Lutz, M.A., Marvin-DiPasquale, M.C., and Riva-Murray, K., 2012, Shallow Groundwater Mercury Supply in a Coastal Plain Stream: Environmental Science & Technology, v. 46, p. 7503−7511.

Davis, J.A., Looker, R.E., Yee, D., Marvin-DiPasquale, M., Grenier, J.L., Austin, C.M., McKee, L.J., Greenfield, B.K., Brodberg, R., and Blum, J.D., 2012, Reducing methylmercury accumulation in the food webs of San Francisco Bay and its local watersheds: Environmental Research, v. 119, p. 3-26.

Huffman, R.L., Wagner, R.J., Toft, J., Cordell, J., DeWild, J.F., Dinicola, R.S., Aiken, G.R., Krabbenhoft, D.P., Marvin-DiPasquale, M., Stewart, A.R., Moran, P.W., and Paulson, A.J., 2012, Mercury species and other selected constituent concentrations in water, sediment and biota of Sinclair Inlet, Kitsap County, Washington, 2007-2010: U.S. Geological Survey Data Series 658, 64 p. [Link]

Slowey, A.J., and Marvin-DiPasquale, M., 2012, How to overcome inter-electrode variability and instability to quantify dissolved oxygen, Fe(II), Mn(II), and S(-II) in undisturbed soils and sediments using voltammetry: Geochemical Transactions, v. 13:6, p. 1-21.



Bradley, P.M., Burns, D.A., Riva- Murray, K., Brigham, M.E., Button, D.T., Chasar, L.C., Marvin-DiPasquale, M., Lowery, M.A., and Journey, C.A., 2011, Spatial and seasonal variability of dissolved methylmercury in two stream basins in the eastern United States: Environmental Science & Technology, v. 45, no. 6, p. 2048-2055.

Fleck, J.A., Alpers, C.N., Marvin-DiPasquale, M., Hothem, R.L., Wright, S.A., Ellett, K., Beaulieu, E., Agee, J.L., Kakouros, E., Kieu, L.H., Eberl, D.D., Blum, A.E., and May, J.T., 2011, The effects of sediment and mercury mobilization in the South Yuba River and Humbug Creek Confluence Area,, Nevada County, California: Concentrations, speciation, and environmental fate - Part 1: Field characterization: U.S. Geological Survey, 104 p. [Open-File Report, 2010-1325A], On-Line: [Link]

Gehrke, G.E., Blum, J.D., and Marvin-DiPasquale, M., 2011, Sources of mercury to San Francisco Bay surface sediment as revealed by mercury stable isotopes: Geochimica et Cosmochimica Acta, v. 75, p. 691–705.

Marvin-DiPasquale, M., Agee, J.L., Kakouros, E., Kieu, L.H., Fleck, J.A., and Alpers, C.N., 2011, The effects of sediment and mercury mobilization in the South Yuba River and Humbug Creek confluence area, Nevada County, California: Concentrations, speciation and environmental fate—Part 2: Laboratory Experiments: U.S. Geological Survey Open-File Report 2010−1325B, 53 p. [Link]



Windham-Myers, L., Marvin-DiPasquale, M.C., Agee, J.L., Kieu, L.H., Kakouros, E., Erikson, L., and Ward, K., 2010, Biogeochemical processes in an urban, restored wetland of San Francisco Bay, California, 2007-2009; methods and data for plant, sediment and water parameters: U.S. Geological Survey Open-File Report 2010-1299, 23 p. [Link]

Windham-Myers, L., Marvin-DiPasquale, M., Fleck, J., Alpers, C.N., Ackerman, J., Eagles-Smith, C., Stricker, C., Stephenson, M., Feliz, D., Gill, G., Bachand, P., Brice, A., and Kulakow, R., 2010, Methylmercury cycling, bioaccumulation, and export from agricultural and non-agricultural wetlands in the Yolo Bypass: Cooperator Final Report prepared for the State Water Resources Control Board, Prepared by U.S. Geological Survey, Calif. Dept. of Fish and Game, Moss Landing Marine Laboratory, Battelle Marine Sciences, Bachand and Associates, Yolo Foundation, 265 p., [Link]


Marvin-DiPasquale, M., Alpers, C.N, and Fleck, J.A., 2009, Mercury, methylmercury, and other constituents in sediment and water from seasonal and permanent wetlands in the Cache Creek Settling Basin and Yolo Bypass, Yolo County, California, 2005–06: U.S. Geological Survey, Open File Report 2009-1182, 69 p. [Link]

Marvin-DiPasquale, M., Lutz, M.A., Brigham, M.E., Krabbenhoft, D.P., Aiken, G.R., Orem, W.H., and Hall, B.D., 2009, Mercury cycling in stream ecosystems. 2. Benthic methylmercury production and bed sediment—pore water partitioning: Environmental Science and Technology, Vol. 43, No. 8, p. 2726–2732.

Ribeiro Guevara, S., Catán, S.P., Marvin-DiPasquale, M., 2009, Benthic methylmercury production in lacustrine ecosystems of Nahuel Huapi National Park, Patagonia, Argentina: Chemosphere, v. 77, no, 4, p. 471-477

Windham-Myers, L., Marvin-DiPasquale, M., Krabbenhoft, D.P., Agee, J.L., Cox, M.H., Heredia-Middleton, P., Coates, C., and Kakouros, E., 2009, Experimental removal of wetland emergent vegetation leads to decreased methylmercury production in surface sediment: J. Geophys. Res., vol. 114, G00C05, 14 p.



Alpers, C., Eagles-Smith, C., Foe, C., Klasing, S., Marvin-DiPasquale, M., Slotton, D., and Winham-Myers, L., 2008, Mercury conceptual model. Sacramento (CA): Delta Regional Ecosystem Restoration Implementation Plan, 58 p. [Link]

Alpers, C.N., Stewart, A.R., Saiki, M.K., Marvin-DiPasquale, M.C., Topping, B.R., Rider, K.M., Gallanthine, S.K., Kester, C.A., Rye, R.O., Antweiler, R.C., and De Wild, J.F., 2008, Environmental factors affecting mercury in Camp Far West Reservoir, California, 2001–03: U.S. Geological Survey Scientific Investigations Report 2006-5008, p 358. [Link]

Hall, B.D., Aiken, G.R., Krabbenhoft, D.P., Marvin-DiPasquale, M., and Swarzenski, C.M., 2008, Wetlands as principal zones of methylmercury production in southern Louisiana and the Gulf of Mexico region: Environ. Pollut., v. 154, no. 1, p. 124-134.

Lutz, M.A., Brigham, M.E., and Marvin-DiPasquale, M., 2008, Procedures for collecting and processing streambed sediment and pore water for analysis of mercury as part of the National Water-Quality Assessment Program: U.S. Geological Survey Open-File Report 2008-1279, 68 p. [Link]

Marvin-DiPasquale, M.C., Lutz, M.A., Krabbenhoft, D.P., Aiken, G.R., Orem, W.H., Hall, B.D., DeWild, J.F., and Brigham, M.E., 2008, Total Mercury, Methylmercury, Methylmercury Production Potential, and Ancillary Streambed-Sediment and Pore-Water Data for Selected Streams in Oregon, Wisconsin, and Florida, 2003–04: U.S. Geological Survey Data Series 375 [Link]

Schuster, P.F., Shanley, J.B., Marvin-DiPasquale, M., Reddy, M.M., Aiken, G., Roth, D.A., Taylor, H.E., Krabbenhoft, D.P., and DeWild, J.F., 2008, Mercury and organic carbon dynamics during runoff episodes from a Northeastern USA watershed: Wat. Air Soil Pollut., v. 187, p. 89-108.

Shanley, J.B., Mast, M.A., Campbell, D.H., Aiken, G.R., Krabbenhoft, D.P., Hunt, R.J., Walker, J.F., Schuster, P.F., Chalmers, A., Aulenbach, B.T., Peters, N.E., Marvin-DiPasquale, M., Clow, D.W., and Shafer, M.M., 2008, Comparison of total mercury and methylmercury cycling at five sites using the small watershed approach: Environ. Pollut., v. 154, no. 1, p. 143-154.

Stewart, A.R., Saiki, M.K., Kuwabara, J.S., Alpers, C.N., Marvin DiPasquale, M., and Krabbenhoft, D.P., 2008, Influence of plankton mercury dynamics and trophic pathways on mercury concentrations of top preditor fish of a mining-impacted reservoir: Can. J. Fish. Aquat. Sci, v. 65, p. 2351-2366.

Yee, D., Collins, J., Grenier, L., Takekawa, J., Tsao-Melcer, D., Woo, I., Schwarzbach, S., Marvin-DiPasquale, M., Windham, L., Krabbenhoft, D., Olund, S., and DeWild, J., 2008, Mercury and Methylmercury Processes in North San Francisco Bay Tidal Wetland Ecosystems. CalFed ERP02D-P62 Final Report.: Submitted to California Bay-Delta Authority Ecosystem Restoration Program. SFEI Contribution #621. San Francisco Estuary Institute, 67 p. [Link]



Gandhi, N., Bhavsar, S.P., Diamond, M.L., Kuwabara, J.S., Marvin-DiPasquale, M., and Krabbenhoft, D.P., 2007, Development of a Mercury Speciation, Fate and Biotic Uptake (BIOTRANSPEC) Model: Application to Lahontan Reservoir (Nevada, USA): Environmental Toxicology & Chemistry, v. 26, no. 11, p. 2260-2273.

Marvin-DiPasquale, M., and Cox, M.H., 2007, Legacy Mercury in Alviso Slough, South San Francisco Bay, California: Concentration, Speciation and Mobility U.S. Geological Survey Open-File Report number 2007-1240, p. 98. [Link]

Marvin-DiPasquale, M., Stewart, A.R., Fisher, N.S., Pickhardt, P., Mason, R.P., Heyes, A., and Winham-Myers, L., 2007, Evaluation Of Mercury Transformations and Trophic Transfer in the San Francisco Bay/Delta: Identifying Critical Processes for the Ecosystem Restoration Program: Final Report for Project # ERP-02-P40. Submitted to the California Bay Delta Authority (CBDA), 40 p. [Link]

Pérez Catán, S., Ribeiro Guevara, S., Marvin-DiPasquale, M., Magnavacca, C., Cohen, I.M., and Arribere, M., 2007, Methodological considerations regarding the use of inorganic197Hg(II) radiotracer to assess mercury methylation potential rates in lake sediment: Applied Radiation and Isotopes, v. 65, p. 987-997.



Alpers, C.N., Hunerlach, M.P., Marvin-DiPasquale, M.C., Antweiler, R.C., Lasorsa, B.K., De Wild, J.F., and Synder, N.P., 2006, Geochemical Data for Mercury, Methylmercury, and Other Constituents in Sediments from Englebright Lake, California, 2002: U.S. Geological Survey, Data Series Report 151, 107 p. [Link]

Brocher, Thomas M.; Carr, Michael D.; Halsing, David L.; John, David A.; Langenheim, Victoria E.; Mangan, Margaret T.; Marvin-DiPasquale, Mark C.; Takekawa, John Y.; Tiedeman, Claire R., 2006. USGS science in Menlo Park -- a science strategy for the U.S. Geological Survey Menlo Park Science Center, 2005-2015. Circular 1290, vi, 42 p.: ill. [Link]



Hunerlach, Michael P.; Alpers, Charles N.; Marvin-DiPasquale, Mark; Taylor, howard E.; DeWild, John F., 2004. Geochemistry of Mercury and other trace elements in fluvial tailings upstream of Daguerre Point Dam, Yuba River, California, August 2001. Scientific Investigations Report 2004-5165, 77 p. [Link]

Snyder, Noah P.; Allen, James R.; Dare, Carlin; Hampton, Margaret A.; Schneider, Gary; Wooley, Ryan J.; Alpers, Charles N.; Marvin-DiPasquale, Mark C., 2004. Sediment Grain-Size and Loss-on-Ignition Analyses from 2002 Englebright Lake Coring and Sampling Campaigns. Open-File Report 2004-1080, 46 p. [Link]

Stamenkovic, J., Gustin, M.S., Marvin-DiPasquale, M., Thomas, B., and Agee, J.L., 2004, Distribution of total and methyl mercury in sediments along Steamboat Creek (Nevada, USA): Science of the Total Environment. v. 322, p. 167-177.

Topping, B.R., Kuwabara, J.S., Marvin-Dipasquale, M., Agee, J.L., Kieu, L.H., Flanders, J.R., Parchaso, F., Hager, S.W., Lopez, C.B., and Krabbenhoft, D.P., 2004, Sediment remobilization of mercury in South San Francisco Bay, California: US Geological Survey Scientific Investigations Report 2004-5196, 59 p. [Link]



Kuwabara, James S.; Alpers, Charles N.; Marvin-Dipasquale, Mark; Topping, Brent R.; Carter, James L.; Stewart, A. Robin; Fend, Steven V.; Parchaso, Francis; Moon, Gerald E.; Krabbenhoft, David P., 2003. Sediment-water interactions affecting dissolved-mercury distributions in Camp Far West Reservoir, California. Water-Resources Investigations Report 2003-4140, 61 p. [Link]

Marvin-DiPasquale, M., and Agee, J.L., 2003, Microbial mercury cycling in sediments of the San Francisco Bay-Delta: Estuaries, v. 26, no. 6, p. 1517-1528.

Marvin-DiPasquale, M., Agee, J., Bouse, R., and Jaffe, B., 2003, Microbial cycling of mercury in contaminated pelagic and wetland sediments of San Pablo Bay, California: Environmental Geology, v. 43, no. 3, p. 260-267.

Marvin-DiPasquale, M.C., Boynton, W.R., and Capone, D.G., 2003, Benthic sulfate reduction along the Chesapeake Bay central channel. II. Temporal controls: Marine Ecology Progress Series, v. 260, p. 55-70.



Kuwabara, James S.; Marvin-Dipasquale, Mark; Praskins, Wayne; Byron, Earl; Topping, Brent R.; Carter, James L.; Fend, Steven V.; Parchaso, Francis; Krabbenhoft, David P.; Gustin, Mae S., 2002. Flux of Dissolved Forms of Mercury Across the Sediment-water Interface in Lahontan Reservoir, Nevada. U.S. Geological Survey, Water-Resources Investigations Report 2002-4138, 49 p. [Link]

Marvin-DiPasquale, M., 2002, Environmental Controls on Methylmercury Production and Degradation in Florida Everglades Sediments, in Proceedings and Summary Report: Workshop on the Fate, Transport, and Transformation of Mercury in Aquatic and Terrestrial Environments, May 8-10, 2001, West Palm Beach, FL, National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, and Toxic Substances Hydrology Program, Office of Water Quality, U.S. Geological Survey, p. B-43. [Link]

Thomas, M.A., Conaway, C.H., Steding, D.J., Marvin-DiPasquale, M., Abu-Saba, K.E., and Flegal, A.R., 2002, Mercury contamination from historic mining in water and sediment, Guadalupe River and San Francisco Bay, California: Geochemistry: Exploration, Environment, Analysis, v. 2, no. 3, p. 211-217.


Marvin-DiPasquale M., Agee, J., and Oremland, R.S., 2001, Environmental Controls on Methylmercury Production and Degradation by Bacteria in Florida Everglades Sediments: U.S. Geological Survey, Administrative Report to the South Florida Water Management District (West Palm Beach, FL), 47 p., including 18 figures.


Krabbenhoft D., Hurley, J., Aiken, G., Gilmour, C., Marvin-Dipasquale, M., Orem, W., and Harris, R., 2000, Mercury cycling in the Florida Everglades: a mechanistic field study: Verhandlungen Internat. Verein Limnologie, v. 27, p. 1657-1660.

Marvin-DiPasquale, M., Agee, J., Alpers, C.N., and Thomas, M., 2000, Microbial Mercury Cycling in Sediments Associated with Historic Mining in California, in Proceedings - Assessing and Managing Mercury from Historic and Current Mining Activities, San Francisco, CA, November 28-30, 2000: U.S. Environmental Protection Agency, Office of Research and Development, p. 63-67.

Marvin-DiPasquale, M., Agee, J., McGowan, C., Oremland, R.S., Thomas, M., Krabbenhoft, D., and Gilmour, C., 2000, Methyl-mercury degradation pathways - A comparison among three mercury-impacted ecosystems: Environmental Science and Technology, v. 34, p. 4908-4916.


Krabbenhoft, D.P., Hurley, J.P., Marvin-DiPasquale, M., Orem, W.H., Aiken, G.R., Schuster, P.F., Gilmour, C.C., and Harris, R., 1999, The Aquatic Cycling of Mercury in the Everglades (ACME) Project; a process-based investigation of mercury biogeochemistry in a complex environmental setting, in Gerould, S., and Higer, A., eds., Proceedings - South Florida restoration science forum, Boca Raton, FL, May 17-19, 1999, Geological Survey program on the South Florida ecosystem: U.S. Geological Survey, Open File Report 99-0181, p. 54-55 [Link]

Marvin-DiPasquale, M., Oren, A., Cohen, Y., and Oremland, R.S., 1999, Radiotracer studies of bacterial methanogenesis in sediments from the Dead Sea and Solar Lake (Sinai),inOren, A., ed., Microbiology and Biogeochemistry of Hypersaline Environments: Boca Raton, CRC Press, p. 149-160.

Marvin-DiPasquale, M., and Oremland, R.S., 1999, Microbial Mercury Cycling in Sediments of the Carson River System, in Watershed Management To Protect Declining Species, Seattle, WA, Amer. Water Res. Assoc., p. 517-520.

Marvin-DiPasquale, M. and Oremland, R.S., 1999, Methylmercury Degradation in the Florida Everglades, in Gerould, S., and Higer, A., eds., Proceedings - South Florida restoration science forum, Boca Raton, FL. May 17-19, 1999, Geological Survey program on the South Florida ecosystem: U.S. Geological Survey, Open File Report 99-0181, p. 70-71. [Link]


Marvin-DiPasquale, M. and Capone, D.G., 1998, Benthic sulfate reduction along the Chesapeake Bay central channel. I. Spatial trends and controls: Marine Ecology Progress Series, v. 168, p. 213-228.

Marvin-DiPasquale, M., and Oremland, R.S., 1998, Bacterial methylmercury degradation in Florida Everglades peat sediment: Environmental Science and Technology, v. 32, p. 2556-2563.


Kemp, W.M., Smith, E.M., Marvin-DiPasquale, M. and Boynton, W.R., 1997, Organic carbon balance and net ecosystem metabolism in Chesapeake Bay: Marine Ecology Progress Series, v. 150, p. 229-248.


Marvin, M.C., 1995, Controls On The Spatial And Temporal Trends Of Benthic Sulfate Reduction And Methanogenesis Along The Chesapeake Bay Central Channel, Ph.D. Dissertation, Marine and Estuarine Environmental Science Program, University of Maryland, 167p.


My Science Topics

Science Topic
Ecology and Environmentwetlands
Ecology and Environmenthabitats
Ecology and Environmentfreshwater ecosystems
Ecology and Environmentestuarine ecosystems
Ecology and Environmentecosystems
Ecology and Environmentecosystem functions
Ecology and Environmentecosystem diversity
Ecology and Environmentecological processes
Ecology and Environmentbenthic ecosystems
Ecology and Environmentaquatic ecosystems

My USGS Science Strategy Areas

Understanding Ecosystems & Predicting Ecosystems Change

Climate Variability & Change

Biogeochemical Cycling at Regional Scales

OBJECTIVE: The overarching focus of this research is to determine how and why major biogeochemical cycles (i.e. C, Fe, S, etc…) and those for elements of concern (e.g. Hg, Se, As, etc…) vary at the ecosystem and regional scales, and how these biogeochemical cycles interact with one another.

PROBLEM STATEMENT: Over the last 30 years, great strides have been made in improving our basic understanding of key biogeochemical cycles of the major elements (e.g. C, S, Fe, etc…), as well as minor elements of concern (e.g. Hg, Se, As, etc…). While many specific pathways and reaction mechanisms have been described, our understanding of how these biogeochemical cycles function and interact with each other over variable temporal and spatial scales is much less robust, particularly at the ecosystem and regional scale.

APPROACH: General approaches to achieving the project's objectives will include a) comparing and contrasting key biogeochemical pathways both within the sub-habitats of a given ecosystem and among systems, b) fostering collaborations with other USGS and non-USGS scientists on projects that are regional in scope, and c) exploring opportunities to link field intensive approaches  with emerging remote monitoring/sensing technologies.

RELEVANCE: Many of the most pressing environmental issues facing society today take place at the spatial scales of ecosystems, and can not be effectively addressed as a suite of isolated site-specific problems. The Project "Biogeochemical Cycling at Regional Scales" was developed to further our understanding of how major biogeochemicals cycles in natural systems (e.g. those involving C, Fe, S, etc...) interact within and across ecosystems. Since major elemental cycles exhert a primary influence on the cycling of toxic metals and harmful anthropogenic contaminants released to the environment, this Project has particular relevence for decision makers who need to better understand the linkages between contaminant cycling and ecosystem management.

Specific Project Descriptions

Brief descriptions of many of the individual projects that Dr. Marvin-DiPasquale is involved in can be found listed under his name on the USGS Microbiology website

Contact Information

Mark Marvin-DiPasquale
Bldg 15, McKelvey Building, 345 Middlefield Road
Menlo Park, CA 94025-3561
650-329-4463 - Fax
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