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Charles S. Hopkinson
Professor and Georgia Sea Grant College Program Director

Mailing Address:
Dr. Charles S. Hopkinson
229 Marine Sciences Bldg.
Department of Marine Sciences
University of Georgia
Athens, GA 30602-3636

Office Phone: (706)542-1855 or 542-6009
FAX Number: (706)542-5888

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Ph.D., 1979, Marine Science, Louisiana State University

M.S., 1973, Marine Science, Louisiana State University

B.S., 1970, Biology, Ursinus College

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Research Emphasis: 

Biogeochemistry and ecology of watersheds, wetlands, estuaries and continental shelves; ecosystem metabolism: stoichiometry and coupling of carbon, nitrogen, phosphorus and oxygen cycles; microbial ecology; land use change and land-water /  land-sea coupling; global ecology; systems ecology – modeling; ecology of coupled human and natural systems

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Selected Publications:

Hopkinson, C. S., and J. W. Day.  1981.  The energy pattern of development in coastal Louisiana: Purchased and natural energies, pp. 413-424.  In: W. Mitsch, R. Bosserman and J. Klopatek (eds.), Energy and Ecological Modeling.  Elsevier, NY.

Hopkinson, C. S., and J. P. Schubauer.  1984.  Static and dynamic aspects of nitrogen cycling in the salt marsh graminoid, Spartina alterniflora.  Ecology 65:961-969.

Hopkinson, C. S.  1985.  Shallow-water benthic and pelagic metabolism - Evidence of net heterotrophy in the nearshore Georgia Bight.  Marine Biology 87:19-32.

Hopkinson, C. S., B. Sherr and H. W. Ducklow.  1987.  Microbial regeneration of ammonium in the water column of Davies Reef, Australia.  Marine Ecology - Progress Series 41:147-153.

Hopkinson, C. S.  1988.  Patterns of organic carbon exchange between coastal ecosystems: The mass balance approach in salt marsh ecosystems, pp. 122-154.  In: B-O. Jansson (ed.), Coastal-Offshore Ecosystem Interactions.  Lecture Notes on Coastal and Estuarine Studies, Vol. 22.  Springer-Verlag.

Hopkinson, C. S., B. Sherr and W. J. Wiebe.  1989.  Size-fractionated coastal plankton metabolism - substrate and nutrient interactions.  Marine Ecology - Progress  Series 51:155-166.

Hopkinson, C. S., R. D. Fallon, B-O Jansson and J. P. Schubauer.  1991.  Community metabolism and nutrient cycling at Gray's Reef hard bottom in the Georgia Bight.  Marine Ecology - Progress Series 73:105-120.

Hopkinson, C. S.  1992. The effects of system coupling on patterns of wetland ecosystem development.  Estuaries 15(4):549-562.

Hopkinson, C. S., L. Cifuentes, D. Burdige, S. Fitzwater, D. Hansell, S. Henrichs, P. Kähler, I. Koike, T. Walsh and B. Bergamaschi.  1993.  The DON Controversy - A report.  Marine Chemistry 41:23-36.

Normann, B., U. Zweifel, C. Hopkinson and B. Fry.  1995.  Production and utilization of dissolved organic carbon during an experimental diatom bloom.  Limnology and Oceanography 40:898-907.

Deegan, L., J. Finn, C. Hopkinson, B. Peterson, A. Giblin, B. Fry and J. Hobbie.  1995. Flow model analysis of the effects of organic matter-nutrient interactions on estuarine trophic dynamics.  In- Dyer, K. and R. Orth (eds.), International Symposium Series, Changes in fluxes in estuaries: implications from science to management.  Olsen and Olsen Publ., Fredensborg, DK.  pages 273-281.

Hopkinson, C. S. and J. Vallino.  1995. The nature of watershed perturbations and their influence on estuarine metabolism.  Estuaries 18:598-621.

Vallino, J. J., C.S. Hopkinson, and J.E. Hobbie. 1996. Modeling bacterial utilization of dissolved organic matter: Optimization replaces Monod growth kinetics. Limnol. Oceanogr. 41:1591-1609.

Hopkinson, C. S., B. Fry, and A. Nolin.  1997.  Stoichiometry of dissolved organic matter dynamics on the continental shelf of the Northeastern U.S.A.  Continental Shelf Research 17:473-489.

Giblin, A., C. Hopkinson, and J. Tucker.  1997.  Benthic metabolism and nutrient cycling in Boston Harbor, Massachusetts.  Estuaries 20:346-364.

Vallino, J. and C. Hopkinson.  1998. Estimation of dispersion and characteristics of mixing times in Plum Island Sound Estuary.  Estuarine, Coastal and Shelf Science 46(3): 333-350.

Hopkinson, C. S., I. Buffam, J. Hobbie, J. Vallino, M. Perdue, B. Eversmeyer, F. Prahl, J. Covert, R. Hodson, M. Moran, E. Smith, J. Baross, B. Crump, S. Findlay, K. Foreman. 1998. Terrestrial inputs of organic matter to coastal ecosystems: An intercomparison of chemical characteristics and bioavailability. Biogeochemistry 43:211-234.

Hopkinson, C. S., A. E. Giblin, J. Tucker and H. Garritt. 1999.  Benthic metabolism and nutrient cycling along an estuarine salinity gradient. Estuaries 22:825-843.

Fisher, T. R., D. Correll, R. Costanza, J. Hollibaugh, C. Hopkinson, R. Howarth, N. Rabalais, J. Richey, C. Vörösmarty and R. Wiegert.  2000.  Synthesizing drainage basin inputs to coastal systems, pages 81-106. In – J. Hobbie (ed.)., Estuarine Science, a synthetic approach to research and practice. Island Press, Washington, D.C. 539 p.

Howarth, R. W., D. Anderson, T. Church, H. Greening, C. Hopkinson, W. Huber, N. Marcus, R. Naiman, K. Segerson, A. Sharpley and W. Wiseman - Committee on the Causes and Management of Coastal Eutrophication.  2000. Clean Coastal Waters – Understanding and reducing the effects of nutrient pollution. Ocean Studies Board and Water Science and Technology Board, Commission on Geosciences, Environment, and Resources, National Research Council. National Academy of Sciences, Washington, D.C. 405 p.

Hopkinson, C. S., A. E. Giblin, and J. Tucker.  2001. Benthic metabolism and nutrient regeneration on the continental shelf off eastern Massachusetts, USA.  Marine Ecology – Progress Series 224:1-19.

Hopkinson, C. S., J. Vallino and A. Nolin.  2002.  Decomposition of dissolved organic matter from the continental margin.  Deep-Sea Research II 49:4461-4478.

Raymond, P. and C. Hopkinson.  2003. Ecosystem modulation of dissolved carbon age in a temperate marsh-dominated estuary.  Ecosystems 6:694-705.

Driscoll, C., D. Whitall, J. Aber, E. Boyer, M. Castro, C. Cronan, C. Goodale, P. Groffman, C. Hopkinson, K. Lambert, G. Lawrence, and S. Ollinger. 2003. Nitrogen pollution in the northeastern United States: Sources, effects and management options.  BioScience 53:357-374.

Pellerin, Brian A., W. Wollheim, C. Hopkinson, W. McDowell, M. Williams, C. Vörösmarty, and M. Daley. 2004. Role of wetlands and developed land use on dissolved organic nitrogen concentrations and DON/TDN in northeastern U.S. rivers and streams. Limnol. Oceanogr. 49: 910-918.

Williams, M. C. Hopkinson, E. Rastetter, and J. Vallino.  2004. N budgets and aquatic uptake in the Ipswich River Basin, northeastern Massachusetts.  Water Resources Research 40(11):1-12.

Filoso, S., J. Vallino, C. Hopkinson, E. Rastetter and Claessens, L. 2004. Modeling Nitrogen Transport in the Ipswich River Basin, Massachusetts, using HSPF. Journal of the American Water Resources Association. 40:1365-1384.

Hopkinson, C. and E. Smith.  2004.  Estuarine respiration, pages 122-146. In- P. del Giorgio and P.J. leB. Williams.  Respiration of Aquatic Ecosystems of the World.  Academic Press, NY.  328 p.

Crump, B. C., C. Hopkinson, M. Sogin and J. Hobbie.  2004.  Microbial biogeography along and estuarine salinity gradient: the combined influences of bacterial growth and residence time.  Applied and Environmental Microbiology 70: 1494-1505

Hopkinson, C. S. and J. Vallino.  2005. Efficient export of carbon to the deep ocean through dissolved organic matter. Nature 433:142-145.

Wollheim, W., B. Pellerin, C. Vörösmarty and C. Hopkinson.  2005. N retention in urbanizing headwater catchments. Ecosystems 8:871-884.

Fagherazzi, S., R. Torres, C. Hopkinson and D. van Proosdij.  2005. Salt marsh geomorphology: physical and ecological effects on landform.  EOS - AGU Transactions 8: 57-58

Vallino, J.J., Hopkinson, C.S., and Garritt, R.H. 2005. Estimating estuarine gross production, community respiration and net ecosystem production: A nonlinear inverse technique. Ecological. Modeling 187:281-296.

Williams, M., C. Hopkinson, E. Rastetter, J. Vallino and L. Claessens.  2005. Relationships of land use and stream solute concentrations in the Ipswich River Basin, northeastern Massachusetts.  Water, Air, and Soil Pollution 161:55-74.

Claessens, L., C. Hopkinson, E. Rastetter, and J. Vallino.  2006. Evaluating the effect of historical changes in land use and climate on the waterbudget of the Ipswich River Basin, Massachusetts, USA. Water Resources Res. 42: WO3246, doi:10.1029/2005WR004131,2006.

Farber, S., R. Costanza, D. Childers, J. Erikson, K. Gross, M. Grove, C. Hopkinson, J. Kahn, S. Pincetl, A. Troy, P. Warren, and M. Wilson.  2006. Linking ecology and economics for ecosystem management.  BioScience 56: 117-129.

Wollheim, W. M., C. Vörösmarty, B. Peterson, S. Seitzinger, and C. Hopkinson.  2006. Relationship between river size and nutrient removal. Geophysical Research Letters 33: LO6410, doi:1029/2006GL025845.4 p.

Hopkinson, C. and A. Giblin. 2008. Salt marsh N Cycling. In- R. Capone, D. Bronk, M. Mulholland and E. Carpenter (eds), Nitrogen in the Marine Environment – 2nd Edition. Elsevier Publ. Pages 977-1022.

Battin, T. J., L. Kaplan, S. Findlay, C. Hopkinson, E. Marti, A. Packman, J. D. Newbold, F. Sabater. 2008. Biophysical controls on organic carbon fluxes in fluvial networks. Nature Geoscience DOI:10.1038/ngeo101.

Hopkinson, C.S., A. E. Lugo, M. Alber, A. Covich and S. van Bloem. 2008. Understanding and forecasting the effects of sea level rise and intense windstorms on coastal and upland ecosystems: the need for a continental-scale network of observatories.  Frontiers in Ecology and Environment 6(5):255-263, doi:10.1890/070153.

Grimm, N., D. Foster, P. Groffman, M. Grove, C. Hopkinson, K. Nadelhoffer, D. Pataki and D. Peters.  2008. Land change: ecosystem responses to urbanization and pollution across climatic and societal gradients.  Frontiers in Ecology and Environment 6(5):264-272, doi:10.1890/070147.







Continental Shelves

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