Nutrient budgets and management actions in the Patuxent River estuary, Maryland

Estuaries and Coasts

Volumn 31, Issue 4, 2008, Pages 623-651

  Boynton, W R ^a   Hagy, J D ^b   Cornwell, J C ^a   Kemp, W M ^a   Greene, S M ^a   Owens, M S ^a   Baker, J E ^a   Larsen, R K ^c  

^a UNIVERSITY OF MARYLAND CENTER FOR ENVIRONMENTAL SCIENCE   (United States)

^b Environmental Protection Agency Laboratory   (United States)

^c ST MARY'S COLLEGE OF MARYLAND   (United States)

Author keywords

Chesapeake Bay; Estuary; Nitrogen; Nutrient budget; Patuxent River estuary; Phosphorus

Indexed keywords

ESTUARINE POLLUTION; MANAGEMENT PRACTICE; NITROGEN; NUTRIENT BUDGET; NUTRIENT ENRICHMENT; NUTRIENT LOSS; PHOSPHORUS; WASTEWATER; WATER QUALITY;

CHESAPEAKE BAY; MARYLAND; NORTH AMERICA; PATUXENT ESTUARY; UNITED STATES;

EID: 48749106395     PISSN: 15592723     EISSN: 15592731     Source Type: Journal    
DOI: 10.1007/s12237-008-9052-9     Document Type: Article

References (115)

1. Academy of Natural Sciences of Philadelphia (ANSP). 1965-1975. Patuxent River, Maryland stream survey reports. ANSP. Pennsylvania: Philadelphia.
2. Barnes, J., F. Rohland, and W. Boynton. 2004. Water quality monitoring program for the sub-estuary comprised of Mill Creek, St. Johns Creek, Back Creek, The Narrows and Solomons Harbor located in Southern Calvert County, Maryland. Technical Report Series No. TS-438-04-CBL. University of Maryland Center for Environmental Science, Solomons, MD.
3. Basta, D.J., M.A. Warren, T.R. Goodspeed, C.M. Blackwell, T.J. Culliton, J.J. McDonough III, M.J. Katz, D.G. Remer, J.P. Tolson, C.J. Klein, S.P. Orlando Jr, and D.M. Lott. 1990. Estuaries of the United States: vital statistics of a national resource base. A Special NOAA 20th Anniversary Report. NOAA, Rockville, MD.
4. W.R. Boynton W.M. Kemp 1985 Nutrient regeneration and oxygen consumption by sediments along an estuarine salinity gradient Marine Ecology Progress Series 23 45 55
5. Boynton, W.R., and F.M. Rohland (eds). 1998. Ecosystem process component. Maryland Chesapeake Bay Water Quality Monitoring Program. Maryland Department of Natural Resources. Level One, Report No. 15. Annapolis, MD. 217.
6. Boynton, W.R., and W.M. Kemp. 2000. Influence of river flow and nutrient loads on selected ecosystem processes: a synthesis of Chesapeake Bay data. In Estuarine science: a synthetic approach to research and practice, ed. J. Hobbie, 269-298. Washington, DC: Island.
7. Boynton, W.R., and F.M. Rohland (eds). 2001. Ecosystem process component. Maryland Chesapeake Bay Water Quality Monitoring Program. Maryland Department of Natural Resources. Level One, Report No. 18. Annapolis, MD.
8. Boynton, W.R., W.M. Kemp, C. Osborne, E. Spaulding, C.W. Keefe, and K.V. Wood. 1982a. Benthic respiration and nutrient fluxes in the vicinity of the chalk point electrical generating system. Final Report, Maryland Department of Natural Resources Power Plant Siting Program. Annapolis, MD.
9. Boynton, W.R., W.M. Kemp, and C.W. Keefe. 1982b. A comparative analysis of nutrients and other factors influencing estuarine phytoplankton production. In Estuarine Comparisons, ed. V.S. Kennedy, 69-90. New York: Academic.
10. W.R. Boynton J.H. Garber R. Summers W.M. Kemp 1995 Inputs, transformations, and transport of nitrogen and phosphorus in Chesapeake Bay and selected tributaries Estuaries 18 285 314
11. W.R. Boynton J.D. Hagy L. Murray C. Stokes W.M. Kemp 1996 A comparative analysis of eutrophication patterns in a temperate coastal lagoon Estuaries 19 2B 408 421
12. Boynton, W.R., N.H. Burger, R.M. Stankelis, F.M. Rohland, J.D. Hagy III, J.M. Frank, L.L. Matteson, and M.M. Weir. 1998. An environmental evaluation of Back River with selected data from Patapsco River. Ref. No. [UMCES]CBL 98-112b. Chesapeake Biological Laboratory, Solomons, MD, 90.
13. S.B. Bricker J.C. Stevenson 1996 Nutrients in coastal waters: a chronology and synopsis of research Estuaries 19 337 341
14. Bricker, S.B., C.G. Clement, D.E. Pirhalla, S.P. Orlando, and D.R.G. Farrow. 1999. National Estuarine eutrophication assessment: effects of nutrient enrichment in the nation's estuaries. NOAA, National Ocean Service, Special Projects Office and the National Centers for Coastal Ocean Science. Silver Spring, MD, 71.
15. M.S. Castro C.T. Driscoll T.E. Jordan W.G. Reay W.R. Boynton 2003 Sources of nitrogen to estuaries in the United States Estuaries 26 3 803 814
16. Cerco, C., and T. Cole. 1992. Application of the Three-dimensional eutrophication model CE-QUAL-ICM to Chesapeake Bay. Draft Technical Report. U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS.
17. Chesapeake Bay Benthic Monitoring Program. 2001. US EPA Chesapeake Bay Program, Annapolis, MD ( http://www.chesapeakebay.net ).
18. Chesapeake Bay Program. 2001. Point source loading database. US EPA Chesapeake Bay Program, Annapolis, MD ( http://www.chesapeakebay.net ).
19. Chesapeake Bay Phytoplankton Monitoring Program. 2001. US EPA Chesapeake Bay Program, Annapolis, MD ( http://www.chesapeakebay.net ).
20. Chesapeake Bay Watershed Model Land Use and Linkages to the Airshed and Estuarine Models. 2000. US EPA Chesapeake Bay Program, Annapolis, MD ( http://www.chesapeakebay.net ).
21. Chesapeake Bay Water Quality Monitoring Program. 2001. US EPA Chesapeake Bay Program, Annapolis, MD ( http://www.chesapeakebay.net ).
22. Chesapeake Bay Zooplankton Monitoring Program. 2001. US EPA Chesapeake Bay Program, Annapolis, MD ( http://www.chesapeakebay.net ).
23. D.J. Conley 2000 Biogeochemical nutrient cycles and nutrient management strategies Hydrobiologia 410 87 96
24. J.C. Cornwell J.C. Stevenson D.J. Conley M. Owens 1996 A sediment chronology of Chesapeake Bay eutrophication Estuaries 19 488 499
25. J.L.W. Cowan W.R. Boynton 1996 Sediment-water oxygen and nutrient exchanges along the longitudinal axis of Chesapeake Bay: seasonal patterns, controlling factors and ecological significance Estuaries 19 3 562 580
26. Cronin, W.B., and D.W. Pritchard. 1975. Additional statistics on the dimensions of the Chesapeake Bay and its tributaries: cross-section widths and segment volumes per meter depth. Special Report 42. Chesapeake Bay Institute, The Johns Hopkins University. Reference 75-3. Baltimore, MD.
27. D. Degobbis M. Gilmartin 1990 Nitrogen, phosphorus, and biogenic silicon budgets for the northern Adriatic Sea Oceanologica Acta 13 31 45
28. C.F. D'Elia W.R. Boynton J. Sanders 2003 A watershed perspective on nutrient enrichment, science, and policy in the Patuxent River, Maryland: 1960-2000 Estuaries 26 2A 171 185
29. Domotor, D.K., M.S. Haire, N.N. Panday, and R.M. Summers. 1989. Patuxent estuary water quality assessment: special emphasis 1983-1987. Technical Report No. 104. MD Dept Environment, Baltimore, MD.
30. R.C. Dugdale J.J. Goering 1967 Uptake of new and regenerated forms of nitrogen in primary productivity Limnology and Oceanography 12 196 206
31. Donigian, Jr A., B. Bicknell, A. Patwardhan, L. Linker, C. Chang, and R. Reynolds. 1994. Chesapeake Bay Program watershed model application to calculate bay nutrient loadings. Annapolis, MD: U.S. EPA Chesapeake Bay Program Office.
32. A. Engqvist 1996 Long-term nutrient balances in the eutrophication of the Himmerfjarden estuary Estuarine, Coastal and Shelf Science 42 483 507
33. B.D. Eyre L.J. McKee 2002 Carbon, nitrogen, and phosphorus budgets for a shallow subtropical coastal embayment (Moreton Bay, Australia) Limnology and Oceanography 47 4 1043 1055
34. D. Fisher M. Oppenheimer 1991 Atmospheric nitrogen deposition and the Chesapeake Bay estuary Ambio 20 3 102 108
35. T.R. Fisher A.B. Gustafson K. Sellner R. Lacuture L.W. Haas R. Magnien R. Karrh B. Michael 1999 Spatial and temporal variation in resource limitation in Chesapeake Bay Marine Biology 133 763 778
36. T.R. Fisher J.D. Hagy III W.R. Boynton M.R. Williams 2006 Cultural eutrophication in the Choptank and Patuxent estuaries of Chesapeake Bay Limnology and Oceanography 51 1, part 2 435 447
37. Gordon Jr, D.C., P.R. Boudreau, K.H. Mann, J.-E. Ong, W.L. Silvert, S.V. Smith, G. Wattayakorn, F. Wulff, and T. Yanagi. 1996. LOICZ Biogeochemical Modelling Guidelines. LOICZ Reports & Studies No 5, 1-96.
38. Greene, S. 2005a. Tidal Freshwater and oligohaline tidal marshes as nutrient sinks in the Patuxent River estuary, Maryland. MS Thesis, University of Maryland, College Park, MD.
39. Greene, S. 2005b. Measurements of denitrification in aquatic ecosystems; Literature review and data report. Technical Report Series Ref. No. [UMCES]CBL 05-094. University of Maryland Center for Environmental Science, Solomons, MD.
40. S.W. Hager L.E. Schemel 1992 Sources of nitrogen and phosphorus to Northern San Francisco Bay Estuaries 15 1 40 52
41. Hagy III, J.D. 1996. Residence times and net ecosystem processes in the Patuxent River Estuary. MS Thesis. University of Maryland, College Park, MD.
42. Hagy, J.D., W.R. Boynton, and M.M. Weir. 1998. Estimating nitrogen and phosphorus loads for Patuxent River, 1960-1977, p.184-211. In Maryland Chesapeake Bay Water Quality Monitoring Program, Ecosystems Processes Component, Level One Report No. 15. Ref. No. [UMCES]CBL, (ed) W.R. Boynton, and F.M. Rohland, 98-073a.Chesapeake Biological Lab, Solomons, MD.
43. J.D. Hagy L.P. Sanford W.R. Boynton 2000 Estimation of net physical transport and hydraulic residence times for a coastal plain estuary using box models Estuaries 23 3 328 340
44. Hagy, J.D., and W.M. Kemp. 2002. LOICZ Biogeochemical Budgets: Patuxent River, Maryland, Land-Ocean Interactions in the Coastal Zone, International Project Office, Netherlands Institute for Sea Research, Texel ( http://www.nioz.nl/loicz/ ).
45. J.D. Hagy W.R. Boynton C.W. Keefe K.V. Wood 2004 Hypoxia in Chesapeake Bay, 1950-2001: long-term change in relation to nutrient loading and river flow Estuaries 27 4 634 658
46. D.R. Heinle 1966 Production of a calanoid copepod, Acartia tonsa, in the Patuxent River estuary Chesapeake Science 7 2 59 74
47. Heinle, D.R., C.F. D'Elia, J.L. Taft, J.S. Wilson, M. Cole-Jones, A.B. Caplins, and L.E. Cronin. 1980. Historical review of water quality and climatic data from Chesapeake Bay with emphasis on effects of enrichment. USEPA Chesapeake Bay Program, Publication 84, Chesapeake Research Consortium.
48. Herman, P.M.J., J.J. Middleburg, J. Van De Koppel, and C.H.R. Heip. 1999. Ecology and estuarine macrobenthos. Advances in Ecological Research 15(2).
49. C.H. Hobbs III J.P. Halka R.T. Kerhin M.J. Carron 1992 Chesapeake Bay sediment budget Journal of Coastal Research 8 2 292 300
50. C. Homer J. Dewitz J. Fry M. Coan N. Hossain C. Larson N. Herold A. McKerrow J.N. VanDriel J. Wickham 2004 Completion of the 2001 National Land Cover Database for the Conterminous United States Photogrammetric Engineering & Remote Sensing 73 4 337 341
51. R.W. Howarth R. Marino J. Lane 1988 Nitrogen fixation in freshwater, estuarine, and marine ecosystems. 1. Rates and importance Limnology and Oceanography 33 4, part 2 669 687
52. R.W. Howarth G. Billen D. Swaney A. Townsend N. Jaworski K. Lajtha J.A. Downing R. Elmgren N. Caraco T. Jordan F. Berendse J. Freney V. Kudeyarov P. Murdoch Z. Zhao-Liang 1996 Regional nitrogen budgets and riverine N & P fluxes for the drainages to the North Atlantic Ocean: natural and human influences Biogeochemistry 35 75 139
53. R.W. Howarth E.W. Boyer W.J. Pabich J.N. Galloway 2002 Nitrogen use in the United States from 1961-2000 and potential future trends Ambio 31 2 88 96
54. H.L. Hu H.M. Chen N.P. Nikolaidis D.R. Miller X.S. Yang 1998 Estimation of nutrient atmospheric deposition to Long Island Sound Water, Air and Soil Pollution 105 521 538
55. M.C. Jenkins W.M. Kemp 1984 The coupling of nitrification and denitrification in two estuarine sediments Limnology and Oceanography 29 609 619
56. R.C. Jones 2000 Long-term trends in phytoplankton chlorophyll a in the tidal freshwater Potomac River, USA: relationship to climate and management factors Verhandlungen-Internationale Vereinigung für Theoretische und Angewandte Limnologie 27 2959 2962
57. T.E. Jordan D.L. Correll D.E. Weller N.M. Goff 1995 Temporal variation in precipitation chemistry on the shore of the Chesapeake Bay Water, Air and Soil Pollution 83 263 284
58. T.E. Jordan D.E. Weller D.L. Correll 2003 Sources of nutrient inputs to the Patuxent River estuary Estuaries 26 2A 226 243
59. Jørgensen, S.E., S.N. Nielsen, and L.A. Jorgensen (eds). 1991. Handbook of ecological parameters and ecotoxicology. Elsevier: Amsterdam, p 1263.
60. 2, and Ar in environmental water samples Analytical Chemistry 66 4166 4170
61. M.S. Kearney A.S. Rogers J.P.R.G. Townsend E. Rizzo D. Stutzer J.C. Stevenson K.L. Sundberg 2002 Landsat imagery shows decline of coastal marshes in Chesapeake and Delaware Bays EOS 3 173 178
62. Keefe, C.W., K.L. Blodnikar, W.R. Boynton, C.A. Clark, J.M. Frank, N.L. Kaumeyer, M.M. Weir, K.V. Wood, and C.F. Zimmermann. 2004. Nutrient analytical services laboratory standard operating procedures. Special Publication Series No. SS-80-04-CBL. University of Maryland System, Center for Environmental and Estuarine Studies, Chesapeake Biological Laboratory, Solomons, MD.
63. W.M. Kemp P.A. Sampou J. Garber J. Tuttle W.R. Boynton 1992 Seasonal depletion of oxygen from the bottom waters of Chesapeake Bay: roles of benthic and planktonic respiration and physical exchange processes Marine Ecology. Progress Serie 85 137 152
64. W.M. Kemp W.R. Boynton J.E. Adolf D.F. Boesch W.C. Boicourt G. Brush J.C. Cornwell T.R. Fisher P.M. Glibert J.D. Hagy L.W. Harding E.D. Houde D.G. Kimmel W.D. Miller R.I.E. Newell M.R. Roman E.M. Smith J.C. Stevenson 2005 Eutrophication of Chesapeake Bay: historical trends and ecological interactions Marine Ecology. Progress Serie 303 1 29
65. H. Khan G.S. Brush 1994 Nutrient and metal accumulation in a freshwater tidal marsh Estuaries 17 2 345 360
66. C. Kroeze S.P. Seitzinger 1998 Nitrogen inputs to rivers, estuaries and continental shelves and related oxide emissions in 1990 and 2050: a global model Nutrient Cycling In Agroecosystems 52 195 212
67. Langland, M.J., R.E. Edwards, L.A. Sprague, and S.E. Yochum. 2001. Summary of trends and status for flow, nutrients and sediments at selected nontidal sites, Chesapeake Bay basin, 1985-99. U.S. Geological Survey Open File Report 01-73. 49p.
68. R.K. Larsen III J.C. Steinbacher J.E. Baker 2001 Ammonia exchange between the atmosphere and the surface waters at two locations In the Chesapeake Bay Environmental Science & Technology 35 4731 4738
69. Lehrter, J.C., and J. Cebrian. 2008. Uncertainty propagation in an ecosystem nutrient budget. EPA Laboratory, 1 Sabine Island Drive, Gulf Breeze FL 32561 (in preparation).
70. Linker, L.C., G.W. Shenk, R.L. Dennis, and J.S. Sweeney. 1999. Cross-media models of the Chesapeake Bay watershed and airshed. Chesapeake Bay Program Office, Annapolis, MD. ( http://www.chesapeakebay.net/modsc.htm ).
71. Maizel, M.S., G. Muehlbach, P. Baynham, J. Zoerkler, D. Monds, T. Iivari, P. Welle, J. Robbin, and J. Wiles. 1997. The potential for nutrient loadings from septic systems to ground and surface water resources and the Chesapeake Bay. U. S. EPA Report No. 903-R-97-005. Washington, DC.
72. Malone, T.C., W. Boynton, T. Horton, and C. Stevenson. 1993. Nutrient loadings to surface waters: Chesapeake Bay case study. In Keeping pace with science and engineering, ed. M.F. Uman, 8-38. Washington, DC: National Academy Press.
73. R. Marino F. Chan R.W. Howarth M. Pace G.E. Likens 2002 Ecological and biogeochemical interactions constrain planktonic nitrogen fixation in estuaries Ecosystems 5 719 725
74. Mauchline, J. 1998. The biology of calanoid copepods. In Advances in marine biology, eds. J.H. Blaxter, A. Southward, and P.A. Tyler, 1-13. NY: Academic710.
75. Merrill, J.Z. 1999. Tidal freshwater marshes as nutrient sinks: particulate nutrient burial and denitrification. PhD Dissertation. University of Maryland. College Park, Maryland. 342p.
76. Merrill, J.L., and J.C. Cornwell. 2000. The role of oligohaline and tidal freshwater marshes in estuarine nutrient cycling. In Concepts and controversies in tidal marsh ecology, (ed), M. Weinstein and D.A. Kreeger, (425-441). Kluwer.
77. Mihursky, J.A., and W.R. Boynton. 1978. Review of Patuxent estuary data base. Chesapeake Biological Laboratory. Ref. No. UMCEES 78-157CBL. Solomons, MD.
78. Mikita, K.A. 2002. An investigation of factors influencing the dynamics of the spring phytoplankton bloom in the Patuxent River estuary, Maryland. MS Thesis, University of Maryland, College Park, MD. 163p.
79. B. Mortazavi R.L. Iverson W. Huang F.G. Lewis J. Caffrey 2000 Nitrogen budget of Apalachicola Bay, a bar-built estuary in the northeastern Gulf of Mexico Marine Ecology Process Series 195 1 14
80. R.J. Naiman J.R. Sibert 1978 Transport of nutrients and carbon from the Nanaimo River to its estuary Limnology and Oceanography 23 6 1183 1193
81. National Atmospheric Deposition Program (NRSP-3)/National Trends Network. 2001. NADP Program Office, Illinois State Water Survey, 2204 Griffith Drive, Champaign. IL 61820.
82. National Oceanographic and Atmospheric Administration/Environmental Protection Agency (NOAA/EPA). 1989. Strategic Assessment of Near Coastal Waters, Susceptibility of East Coast Estuaries to Nutrient Discharges: Passamaquoddy Bay to Chesapeake Bay. Strategic Assessment Branch, NOS/NOAA, Rockville, MD.
83. National Research Council. 2000. Clean coastal waters. Understanding and reducing the effects of nutrient pollution. Committee on the Causes and Management of Coastal Eutrophication, Ocean Studies Board and Water Sciences and Technology Board, National Research Council. 393. Washington, D.C.: National Academy Press.
84. S.W. Nixon 1997 Prehistoric nutrient inputs and productivity in Narragansett Bay Estuaries 20 2 253 261
85. Nixon, S.W., C.D. Hunt, and B.L. Nowicki. 1986a. The retention of nutrients (C,N,P), heavy metals (Mn, Cd, Pb, Cu), and petroleum hydrocarbons in Narragansett Bay. In Biogeochemical processes at the land-sea boundary, eds. P. Lasserre, and J.M. Martin, 99-122. New York, NY: Elsevier Oceanography Series, 43.
86. S.W. Nixon C.A. Oviatt J. Frithsen B. Sullivan 1986 Nutrients and the productivity of estuarine and coastal marine systems Journal of the Limnological Society of South Africa 12 1/2 43 71
87. S.W. Nixon S.L. Granger B.L. Nowicki 1995 An assessment of the annual mass balance of carbon, nitrogen and phosphorus in Narragansett Bay Biogeochemistry 31 15 61
88. S.W. Nixon J.W. Ammerman L.P. Atkinson V.M. Berounsky G. Billen W.C. Boicourt W.R. Boynton T.M. Church D.M. Ditoro R. Elmgren J.H. Garber A.E. Giblin R.A. Jahnke N.J.P. Owens M.E.Q. Pilson S.P. Seitzinger 1996 The fate of nitrogen and phosphorus at the land-sea margin of the North Atlantic Ocean Biogeochemistry 35 141 180
89. H.W. Paerl 1997 Coastal eutrophication and harmful algal blooms: importance of atmospheric deposition and groundwater as "new" nitrogen and other nutrient sources Limnology and Oceanography 42 5, part 2 1154 1165
90. N.N. Rabalais 2002 Nitrogen in aquatic ecosystems Ambio 31 2 102 112
91. W.P. Roberts J.W. Pierce 1974 Sediment yield in the Patuxent River, MD undergoing urbanization, 1968-1969 Sedimentary Geology 12 179 197
92. S. Rysgaard N. Risgaard-Petersen N.P. Sloth K. Jensen L.P. Nielsen 1994 Oxygen regulation of nitrification and denitrification in sediments Limnology and Oceanography 39 7 1643 1652
93. S. Rysgaard P.B. Christensen L.P. Nielsen 1995 Seasonal variation in nitrification and denitrification in estuarine sediments colonized by benthic microalgae and bioturbating infauna Marine Ecology. Progress Serie 126 111 121
94. Schubel, J.R., and C.F. Zabawa. 1977. Agnes in the geological record of the upper Chesapeake Bay, p. 240-248. In the effects of tropical storm Agnes on the Chesapeake Bay System. Baltimore, MD: CRC Publ. No. 54. The Johns Hopkins University Press.
95. Shenk, G.W., and L.C. Linker. 2001. Simulating the Chesapeake Bay watershed with time-varying land use and management actions. EPA Chesapeake Bay Program Report, Annapolis, MD. 13p.
96. Smith, E.M. 2000. Factors regulating respiration and its coupling to primary production in a coastal planktonic community. PhD Dissertation, University of Maryland, College Park, MD.285p.
97. Smith, S.V. 1981. Responses of Kaneohe Bay, Hawaii, to relaxation of sewage stress. In Estuaries and nutrients, eds. B.J. Neilson, and L.E. Cronin, 391-410. Clifton, NJ: Humana.
98. Smullen, J.T., J.L. Taft, and J. Macknis. 1982. Nutrient and sediment loads to the tidal Chesapeake Bay system. In United States Environmental Protection Agency, Chesapeake Bay Program. p. 147-258. Technical Studies: a Synthesis. Washington, DC.
99. Stammerjohn, S.E., E. Smith, W.R. Boynton, and W.M. Kemp. 1991. Potential impacts from marinas and boats in Baltimore Harbor. Chesapeake Research Consortium Publication Number 139. Solomons, MD.
100. R.M. Stankelis M.D. Naylor W.R. Boynton 2003 Submerged aquatic vegetation In the mesohaline region of the Patuxent estuary: past, present and future status Estuaries 26 2A 186 195
101. Stevenson, J.C., M.S. Kearney, and E.M. Koch. 2002. Impacts of sea-level rise on tidal wetlands and shallow water habitats: a case study from Chesapeake Bay. In Fisheries in a Changing Environment, (ed) N.A. McGinn, 23-36. American Fisheries Society Symposium No. 32.
102. Sweeney, B.F. 1995. Community metabolism in the Patuxent River estuary: 1963-1969 and 1992. Masters Thesis. University of Maryland, College Park, MD. 83p.
103. Testa, J.M. 2006. Factors regulating variability in water quality and net biogeochemical fluxes in the Patuxent River estuary. Univ Maryland Masters Thesis, College Park, MD p.1-166.
104. Twilley, R.R., and W.M. Kemp. 1987. Estimates of sediment denitrification and its influence on the fate of nitrogen in Chesapeake Bay. Annapolis, MD: USEPA, Chesapeake Bay Program.
105. United States Geological Survey. 2004. Chesapeake Bay River Input Monitoring Program. URL://va.water.usgs.gov/chesbay/RIMP/index.html.
106. I. Valiela J.E. Costa 1988 Eutrophication of Buttermilk Bay, a Cape Cod coastal embayment: concentrations of nutrients and watershed nutrient budgets Environmental Management 12 4 539 553
107. I. Valiela J.L. Bowen M.L. Cole K.D. Kroeger D. Lawrence W.J. Pabich G. Tomasky S. Mazzilli 2001 Following up on a Margalevian concept: interactions and exchanges among adjacent parcels of coastal landscapes Scientia Marina 65 Suppl. 2 215 229
108. N. Van Breemen E.W. Boyer C.L. Goodale N.A. Jaworski K. Paustian S.P. Seitzinger K. Lajtha B. Mayer D. Van Dam R.W. Howarth K.J. Nadelhoffer M. Eve G. Billen 2002 Where did all the nitrogen go? Fate of nitrogen inputs to large watersheds in the northeastern U.S.A Biogeochemistry 57/58 267 293
109. P.M. Vitousek H.A. Mooney J. Lubchenco J.M. Melillo 1997 Human domination of earth's ecosystems Science 277 494 499
110. J. Walve U. Larsson 1999 Carbon, nitrogen and phosphorus stoichiometry of crustacean zooplankton in the Baltic Sea: implications for nutrient cycling Journal of Plankton Research 21 12 2309 2321
111. Wiedeman, A., and A. Cosgrove. 1998. Chesapeake Bay Watershed Model Application and Calculation of Nutrient and sediment loading-Appendix F: phase IV Chesapeake Bay Watershed Model Point Source Loads. Report of the Nutrient Subcommittee. Chesapeake Bay Program Office, Annapolis, MD ( http://www.chesapeakebay.net/modsc.htm ).
112. Wies, R.A., and R.J. O'Melia. 1989. Acid rain deposition monitoring. Air Management Division. Maryland Department of the Environment. Baltimore, MD.
113. M.R. Williams T.R. Fisher W.R. Boynton C.F. Cerco W.M. Kemp K.N. Eshleman S.-C. Kim R.R. Hood D.A. Fiscus G.R. Radcliffe 2006 An integrated modeling system for management of the Patuxent River estuary and basin, Maryland, USA International Journal of Remote Sensing 27 17 3705 3726
114. A. Yurkovskis F. Wulff L. Rahm A. Andruzaitis M. Rodrigues-Medina 1993 A nutrient budget of Gulf of Riga; Baltic Sea Estuarine, Coastal and Shelf Science 37 113 127
115. X. Zheng C. Fu X. Xu X. Yan Y. Huang S. Han F. Hu G. Chen 2002 The Asian nitrogen cycle case study Ambio 31 2 79 87