Nitrogen as the limiting nutrient for eutrophication in coastal marine ecosystems: Evolving views over three decades

Limnology and Oceanography

Volumn 51, Issue 1 II, 2006, Pages 364-376

  Howarth, Robert W ^a   Marino, Roxanne ^a  

^a NONE

Author keywords

[No Author keywords available]

Indexed keywords

ESTUARINE ECOSYSTEM; EUTROPHICATION; NITROGEN; NUTRIENT LIMITATION;

EID: 32944476334     PISSN: 00243590     EISSN: None     Source Type: Journal    
DOI: 10.4319/lo.2006.51.1_part_2.0364     Document Type: Conference Paper

References (131)

1. BELLANCA, M. A. 1981. Management implications of nutrient standards, p. 263-278. In B. J. Neilson and L. E. Cronin [eds.], Estuaries and Nutrients. Humana Press.
2. BILLEN, G., C. LANCELOT, AND M. MEYBECK. 1991. N, P, and Si retention along the aquatic continuum from land to ocean, p. 19-44. In R. F. C. Mantoura, J. M. Martin, and R. Wollast [eds.], Ocean margin process in global change. Wiley.
3. BLOMQVIST, S., A. GUNNARS, AND R. ELMGREN. 2004. Why the limiting nutrient differs between temperate coastal seas and freshwater lakes: A matter of salt. Limnol. Oceanogr. 49: 2236-2241.
4. BOESCH, D. F. 2002. Challenges and opportunities for science in reducing nutrient over-enrichment of coastal ecosystems. Estuaries 25: 744-758.
5. _, J. C. FIELD, AND D. SCAVIA. 2000. The potential consequences of climate variability and change on coastal areas and marine resources. A report of the National Assessment Group for the US Global Change Research Program. NOAA Coastal Ocean Program Decision Analysis Series No. 21. National Oceanic and Atmospheric Administration.
6. BOYNTON, W. R., AND W. M. KEMP. 1985. Nutrient regeneration and oxygen consumption by sediments along an estuarine salinity gradient. Mar. Ecol. Prog. Ser. 23: 45-55.
7. _, AND C. W. KEEFE. 1982. A comparative analysis of nutrients and other factors influencing estuarine phytoplankton production, p. 69-90. In V. S. Kennedy [ed.], Estuarine comparisons. Academic.
8. BRICKER, S. B., C. G. CLEMENT, D. E. PIRHALL, S. P. ORLANDO, AND D. R. G. FARROW. 1999. National estuarine eutrophication assessment: A summary of conditions, historical trends, and future outlook. Special Projects Office and National Centers for Coastal Ocean Sciences, National Ocean Service, National Oceanic and Atmospheric Administration.
9. BROCKMAN, U. H., P. M. LAANE, AND H. POSTMA. 1990. Cycling of nutrient elements in the North Sea. Neth. J. Sea Res. 26: 239-264.
10. BROECKER, W. S. 1974. Chemical oceanography. Harcourt, Brace, Jovanovich.
11. CARACO, N., J. J. COLE, AND G. E. LIKENS. 1989. Evidence for sulfate-controlled phosphorus release from sediments of aquatic systems. Nature 341: 316-318.
12. _, AND _. 1990. A comparison of phosphorus immobilization in sediments of freshwater and coastal marine systems. Biogeochemistry 9: 277-290.
13. CARPENTER, E. J., AND D. G. CAPONE [EDS.]. 1983. Nitrogen in the marine environment. Academic.
14. CARPENTER, S. R., N. F. CARACO, D. L. CORRELL, R. W. HOWARTH, A. N. SHARPLEY, AND V. H. SMITH. 1998a. Nonpoint pollution of surface waters with phosphorus and nitrogen. Issues Ecol. 3: 1-12.
15. _, AND _. 1998b. Nonpoint pollution of surface waters with phosphorus and nitrogen. Ecol. Appl. 8: 559-568.
16. CHAVE, P. 2001. The EU Water Framework Directive: An introduction. IWA Publishing.
17. CLOERN, J. E. 2001. Our evolving conceptual model of the coastal eutrophication problem. Mar. Ecol. Prog. Ser. 210: 223-253.
18. CONLEY, D. J. 2000. Biogeochemical nutrient cycles and nutrient management strategies. Hydrobiologia 410: 87-96.
19. _, C. L. SCHELSKE, AND E. F. STOERMER. 1993. Modification of silica biogeochemistry with eutrophication in aquatic systems. Mar. Ecol. Prog. Ser. 101: 179-192.
20. COSTANZA, R., AND OTHERS. 1997. The value of the world's ecosystem services and natural capital. Nature 387: 253-260.
21. CUGIER, P., G. BILLEN, J. F. GUILLAND, J. GARNIER, AND A. MÉNESGUEN. 2005. Modelling the eutrophication of the Seine Bight (France) under historical, present and future riverine nutrient loading. J. Hydrol. 304: 381-396.
22. D'ELIA, C. F., J. G. SANDERS, AND W. R. BOYNTON. 1986. Nutrient enrichment studies in a coastal plain estuary: Phytoplankton growth in large-scale, continuous cultures. Can. J. Fish. Aquat. Sci. 43: 397-406.
23. DODDS, W. K. 2003. Misuse of inorganic N and soluble reactive P concentrations to indicate nutrient status of surface waters. J. N. Am. Benthol. Soc. 22: 171-181.
24. ELMGREN, R., AND U. LARSSON. 1997. Himmerfjarden: Forandringar i ett naringsbelastat kustekyosystem i Ostersjon. Rapport 4565. Naturvardsverket Forlag.
25. ENVIRONMENTAL PROTECTION AGENCY (EPA). 2001. Nutrient criteria technical guidance manual, estuarine and coastal marine waters. EPA-822-B-01-003, U.S. Environmental Protection Agency.
26. FEDERAL WATER POLLUTION CONTROL ADMINISTRATION. 1968. Water quality criteria. Report of the National Technical Advisory Committee to the Secretary of the Interior. U.S. Department of the Interior.
27. FLETT, R. J., D. W. SCHINDLER, R. D. HAMILTON, AND N. E. R. CAMPBELL. 1980. Nitrogen fixation in Canadian Precambrian Shield lakes. Can. J. Fish. Aquat. Sci. 37: 494-505.
28. FROHLICH, P. N. 1988. Kinetic control of dissolved phosphate in natural rivers and estuaries: A primer on the phosphate buffer mechanism. Limnol. Oceanogr. 33: 649-668.
29. FUHS, G. W., S. D DEMMERLE, E. CANELLI, AND M. CHEN. 1972. Characterization of phosphorus-limited algae (with reflections on the limiting-nutrient concept). Limnol. Oceanogr. Special Symp. 1: 113-132.
30. GALLOWAY, J. N., AND OTHERS. 2004. Nitrogen cycles; Past, present, and future. Biogeochemistry 70: 153-226.
31. GLIBERT, P. M., AND G. PITCHER. 2001. Global Ecology and Oceanography of Harmful Algal Blooms (GEOHAB): Science plan. SCOR and UNESCO.
32. GRANÉLI, E. 1978. Algal assay of limiting nutrients for phytoplankton production in the Oresund. Vatten 2: 117-128.
33. _, K. WALLSTROM, U. LARSSON, W. GRANÉLI, AND R. ELMGREN. 1990. Nutrient limitation of primary production in the Baltic Sea area. Ambio 19: 142-151.
34. HECKY, R. E. 1998. Low N:P ratios and the nitrogen fix: Why watershed nitrogen removal will not improve the Baltic, p. 85-115. In Effects of nitrogen in the aquatic environment, KVA Report 1998: 1, Kungl. Vetenskapsakademien (Royal Swedish Academy of Sciences), Stockholm.
35. _, AND P. KILHAM. 1988. Nutrient limitation of phytoplankton production in freshwater and marine environments: A review of recent evidence on the effects of enrichment. Limnol. Oceanogr. 33: 796-822.
36. HELLSTROM, T. 1998. Why nitrogen is not limiting production in the seas around Sweden, p. 11-22. In Effects of nitrogen in the aquatic environment, KVA Report 1998: 1, Kungl. Vetenskapsakademien (Royal Swedish Academy of Sciences), Stockholm.
37. HOWARTH, R. W. 1988. Nutrient limitation of net primary production in marine ecosystems. Ann. Rev. Ecol. Syst. 19: 89-110.
38. _. 2003. Human acceleration of the nitrogen cycle: Drivers, consequences, and steps towards solutions, p. 3-12. In E. Choi and Z. Yun [eds.], Proceedings of the Strong N and Agro 2003 IWA Specialty Symposium. Korea Univ.
39. _, E. W. BOYER, W. J. PABICH, AND J. N. GALLOWAY. 2002. Nitrogen use in the United States from 1961-2000 and potential future trends. Ambio 31: 88-96.
40. _, F. CHAN, AND R. MARINO. 1999. Do top-down and bottom-up controls interact to exclude nitrogen-fixing cyanobacteria from the plankton of estuaries: Explorations with a simulation model. Biogeochemistry 46: 203-231.
41. _, H. S. JENSEN, R. MARINO, AND H. POSTMA. 1995. Transport to and processing of P in near-shore and oceanic waters, p. 323-345. In H. Tiessen [ed.], Phosphorus in the global environment. Wiley.
42. _, AND R. MARINO. 1990. Nitrogen-fixing cyanobacteria in the plankton of lakes and estuaries: A reply to the comment by Smith. Limnol. Oceanogr. 35: 1859-1863.
43. _, AND _. 1998. A mechanistic approach to understanding why so many estuaries and brackish waters are nitrogen limited, p. 117-136. In Effects of nitrogen in the aquatic environment, KVA Report 1998: 1, Kungl. Vetenskapsakademien (Royal Swedish Academy of Sciences), Stockholm.
44. _, AND J. J. COLE. 1988a. Nitrogen fixation in freshwater, estuarine, and marine ecosystems. 2. Biogeochemical controls. Limnol. Oceanogr. 33: 688-701.
45. _, J. LANE, AND J. J. COLE. 1988b. Nitrogen fixation in freshwater, estuarine, and marine ecosystems. 1. Rates and importance. Limnol. Oceanogr. 33: 669-687.
46. _, AND D. SCAVIA. 2003. Priority topics for nutrient pollution in coastal waters: An integrated national research program for the United States. National Centers for Coastal Ocean Science, National Ocean Service, National Oceanic and Atmospheric Administration.
47. _, AND A. F. MICHAELS. 2000. The measurement of primary production in aquatic ecosystems, p. 72-85. In O. Sala, R. Jackson, H. Mooney, and R. W. Howarth [eds.]. Methods in ecosystem science. Springer.
48. _, D. SWANEY, T. J. BUTLER, AND R. MARINO. 2000a. Climatic control on eutrophication of the Hudson River estuary. Ecosystems 3: 210-215.
49. _, AND OTHERS. 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.
50. _, AND OTHERS. 2000b. Nutrient pollution of coastal rivers, bays, and seas. Issues Ecol. 7: 1-15.
51. _, AND OTHERS. In press. Chapter 9: Nutrient Management, Responses Assessment. The Millenium Assessment.
52. HUBER, A. L. 1986. Nitrogen fixation by Nodularia spumigina Mertins (Cyanobacteriaceae). 1. Field studies and the contribution of blooms to the nitrogen budget of the Peel-Harvey estuary, western Australia. Hydrobiologia 131: 193-203.
53. HUMBORG, C., D. J. CONLEY, L. RAHM, F. WULFF, A. COCIASU, AND V. ITTEKKOT. 2000. Silicon retention in river basins: Far-reaching effects on biogeochemistry and aquatic food webs in coastal marine environments. Ambio 29: 45-50.
54. JAWORSKI, N. A., D. W. LEAR, AND O. VILLA. 1972. Nutrient management in the Potomac estuary. Limnol. Oceanogr. Special Symp. 1: 246-272.
55. JENSEN, H. S., K. J. MCGLATHERY, R. MARINO, AND R. W. HOWARTH. 1998. Forms and availability of sediment phosphorus in carbonate sand of Bermuda seagrass beds. Limnol. Oceanogr. 43: 799-810.
56. JOHNSTON, J. 1908. Conditions of life in the sea (reproduced 1977). Arno Press.
57. JONES, G. J., S. I. BLACKBURN, AND N. S. PARKER. 1994. A toxic bloom of Nodularia spumigena Mertens in Orielton Lagoon, Tasmania. Aust. J. Mar. Freshwat. Res. 45: 787-800.
58. JOYE, S. B., AND H. W. PAERL. 1993. Contemporaneous nitrogen-fixation and denitrification in intertidal microbial mats - rapid response to runoff events. Mar. Ecol. Prog. Ser. 94: 267-274.
59. _, AND _. 1994. Nitrogen cycling in microbial mats: Rates and patterns of denitrification and nitrogen fixation. Mar. Biol. 119: 285-295.
60. JUSTIC, D., N. N. RABALAIS, AND R. E. TURNER. 1995. Stoichiometric nutrient balance and origin of coastal eutrophication. Mar. Pollut. Bull. 30: 41-46.
61. KARL, D, AND OTHERS. 2002. Dinitrogen fixation in the world's oceans. Biogeochemistry 57/58: 47-98.
62. KOOP, K., W. R. BOYNTON, F. WULFF, AND R. CARMAN. 1990. Sediment-water exchange and nutrient exchanges along a depth gradient in the Baltic Sea. Mar. Ecol. Prog. Ser. 63: 65-77.
63. KROM, M. D., AND R. A. BERNER. 1980. Adsorption of phosphate in anoxic marine sediments. Limnol. Oceanogr. 25: 797-806.
64. _, N. KRESS, S. BRENNER, AND L. I. GORDON. 1991. Phosphorus limitation of primary productivity in the eastern Mediterranean Sea. Limnol. Oceanogr. 36: 424-432.
65. LIKENS, G. E. [ED.]. 1972. Nutrients and eutrophication. Limnol. Oceanogr. Special Symp 1: American Society of Limnology and Oceanography.
66. _. 1972. Preface. Limnol. Oceanogr. Special Symp. 1:v-vi. American Society of Limnology and Oceanography.
67. LIN, H. J., S. W. NIXON, D. I. TAYLOR, S. L. GRANGER, AND B. A. BUCKLEY. 1995. Responses of epiphytes on eelgrass, Zostera marina L., to separate and combined nitrogen and phosphorus enrichment. Aquat. Bot. 52: 243-258.
68. LUKATELICH, R. J., AND A. J. MCCOMB. 1986. Nutrient levels and the development of diatom and blue-green algal blooms in a shallow Australian estuary. J. Plankton Res. 8: 597-618.
69. MALONE, T. C., D. J. CONLEY, T. F. FISHER, P. M. GLIBERT, L. W. HARDING, AND K. G. SELLNER. 1996. Scales of nutrient-limited phytoplankton productivity in Chesapeake Bay. Estuaries 19: 371-385.
70. MARINO, R., F. CHAN, R. HOWARTH, M. PACE, AND G. LIKENS. 2002. Ecological and biogeochemical interactions constrain planktonic nitrogen fixation in estuaries. Ecosystems 5: 719-725.
71. 2 fixation in saline estuaries: I. nutrients and grazing. Mar. Ecol. Prog. Ser.
72. _, R. W. HOWARTH, F. CHAN, J. J. COLE, AND G. E. LIKENS. 2003. Sulfate inhibition of molybdenum-dependent nitrogen fixation by planktonic cyanobacteria under seawater conditions: a non-reversible effect. Hydrobiologia 500: 277-293.
73. MCCARTHY, J. 1980. Nitrogen, p. 191-233. In I. Morris [ed.], The physiological ecology of phytoplankton. Blackwell.
74. MCGLATHERY, K. J., R. MARINO, AND R. W. HOWARTH. 1994. Variable rates of phosphate uptake by shallow marine sediments: Mechanisms and ecological significance. Biogeochemistry 25: 127-146.
75. MEYERS, V. B., AND R. I. IVERSON. 1981. Phosphorus and nitrogen limited phytoplankton productivity in Northeastern Gulf of Mexico coastal estuaries, p. 569-582. In B. J. Neilson and L. E. Cronin [eds]. Estuaries and nutrients. Humana.
76. MOISANDER, P. H., T. F. STEPPE, N. S. HALL, J. KUPARINENT, AND H. W. PAERL. 2003. Variability in nitrogen and phosphorus limitation for Baltic Sea phytoplankton during nitrogen-fixing cyanobacterial blooms. Mar. Ecol. Prog. Ser. 262: 81-95.
77. NEILSON, B. J., AND L. E. CRONIN [EDS]. 1981. Estuaries and nutrients. Humana.
78. NEWELL, R. I., J. C. CORNWELL, AND M. S. OWENS. 2002. Influence of simulated bivalve biodeposition and microphytobenthos on sediment nitrogen dynamics: A laboratory study. Limnol. Oceanogr. 47: 1367-1379.
79. NIXON, S. W. [ED.]. 1988. Comparative ecology of freshwater and marine ecosystems. Limnol. Oceanogr. 33: (entire issue).
80. _. 1995. Coastal marine eutrophication: A definition, social causes, and future concerns. Ophelia 41: 199-219.
81. _, AND OTHERS. 1996. The fate of nitrogen and phosphorus at the land-sea margin of the North Atlantic Ocean. Biogeochemistry 35: 141-180.
82. _, B. BUCKLEY, S. GRANGER, AND J. BINTZ. 2001. Responses of very shallow marine ecosystems to nutrient enrichment. Human Ecol. Risk Assess. 7: 1457-1481.
83. _, S. L. GRANGER, AND B. L. NOWICKI. 1995. An assessment of the annual mass balance of carbon, nitrogen, and phosphorus in Narragansett Bay. Biogeochemistry 31: 15-61.
84. _, J. R. KELLY, B. N. FURNAS, C. A. OVIATT, AND S. S. HALE. 1980. Phosphorus regeneration and the metabolism of coastal marine bottom communities, p. 219-242. In K. R. Tenore and B. C. Coull [eds.], Marine benthic dynamics. Univ. of South Carolina Press.
85. _, C. A. OVIATT, J. FRITHSEN, AND B. SULLIVAN. 1986. Nutrients and the productivity of estuarine and coastal marine ecosystems. J. Limnol. Soc. South Africa 12: 43-71.
86. _, AND M. E. Q. PILSON. 1983. Nitrogen in estuarine and coastal marine ecosystems, p. 565-647. In E. J. Carpenter and D. G. Capone [eds.], Nitrogen in the marine environment. Academic.
87. NRC. 1993. Managing wastewater in coastal urban areas. National Academies Press.
88. _. 2000. Clean coastal waters: Understanding and reducing the effects of nutrient pollution. National Academies Press.
89. OVIATT, C. A., P. DOERING, B. NOWICKI, L. REED, J. COLE, AND J. FRITHSEN. 1995. An ecosystem level experiment on nutrient limitation in temperate coastal marine environments. Mar. Ecol. Prog. Ser. 116: 171-179.
90. 2 formation. Limnol. Oceanogr. 30: 1246-1252.
91. 2 fixation in natural waters, p. 305-344. In K. C. Marshall [ed.], Advances in microbial ecology. Plenum.
92. _, AND J. P. ZEHR. 2000. Marine nitrogen fixation, p. 387-426. In D. L. Kirchman [ed.], Microbial ecology of the oceans. Wiley-Liss.
93. PIEHLER, M. F., J. DUYBLE, P. M. MOISANDER, J. L. PINCKNEY, AND H. W. PAERL. 2002. Effects of modified nutrient concentrations and ratios on the structure and function of the native phytoplankton community in the Neuse River Estuary, North Carolina, USA. Aquat. Ecol. 36: 371-385.
94. POMEROY, L. R., L. R. SHENTON, R. D. H. JONES, AND R. J. REIMOLD. 1972. Nutrient flux in estuaries. Limnol. Oceanogr. Special Symp. 1: 274-291.
95. POSTMA, H. 1985. Eutrophication of Dutch coastal waters. Neth. J. Zool. 35: 348-359.
96. RABALAIS, N. N., R. E. TURNER, Q. DORTCH, D. JUSTIC, V. J. BIERMAN, JR., AND W. J. WISEMAN, JR. 2002b. Review. Nutrient-enhanced productivity in the northern Gulf of Mexico: Past, present and future. Hydrobiologia 475/476: 39-63.
97. _, AND W. J. WISEMAN, JR. 2002a. Hypoxia in the Gulf of Mexico, a.k.a. "The Dead Zone." Ann. Rev. Ecol. Syst. 33: 235-263.
98. REDFIELD, A. C. 1958. The biological control of chemical factors in the environment. Am. Sci. 46: 205-221.
99. ROSENBERG, R., R. ELMGREN, S. FLEISCHER, P. JONSSON, G. PERSSON, AND H. DAHLIN. 1990. Marine eutrophication case studies in Sweden. Ambio 19: 102-108.
100. RYTHER, J. H. 1954. The ecology of phytoplankton blooms in Moriches Bay and Great South Bay, Long Island, New York. Biol. Bull. 106: 198-209.
101. _, AND W. M. DUNSTAN. 1971. Nitrogen, phosphorus, and eutrophication in the coastal marine environment. Science 171: 1008-1012.
102. SCAVIA, D., AND OTHERS. 2002. Climate change impacts on US coastal and marine ecosystems. Estuaries 25: 149-164.
103. SCHINDLER, D. W. 1974. Eutrophication and recovery in experimental lakes: Implications for lake management. Science 184: 987-899.
104. _. 1977. Evolution of phosphorus limitation in lakes. Science 195: 260-262.
105. _. 1981. Studies of eutrophication in lakes and their relevance to the estuarine environment, p. 71-82. In B. J. Neilson and L. E. Cronin [eds.], Estuaries and nutrients. Humana Press.
106. _, E. J. FEE, AND T. RUSZCYNSKI. 1978. Phosphorus input and its consequences for phytoplankton standing crop and production in the Experimental Lakes Area and in similar lakes. J. Fish. Res. Board Can. 35: 190-196.
107. SEITZINGER, S. P. 1988. Denitrification in freshwater in coastal marine ecosystems: Ecological and geochemical significance. Limnol. Oceanogr. 33: 702-724.
108. SEITZINGER, S. P., AND OTHERS. 2002. Nitrogen retention in rivers: Model development and application to watersheds in the northeastern US. Biogeochemistry 57/58: 199-237.
109. SHORT, F. T., W. C. DENNISON, AND D. C. CAPONE. 1990. Phosphorus-limited growth of the tropical seagrass Syringodium filiforme in carbonate sediments. Mar. Ecol. Prog. Ser. 62: 169-174.
110. SMAYDA, T. J. 1974. Bioassay of the growth potential of the surface water of lower Narragansett Bay over an annual cycle using the diatom Thalassiosira pseudonana (oceanic clone, 13-1). Limnol. Oceanogr. 19: 889-901.
111. _. 1997. Harmful algal blooms: Their ecophysiology and general relevance to phytoplankton blooms in the sea. Limnol. Oceanogr. 42: 1137-1153.
112. SMITH, V. H. 1983. Low nitrogen to phosphorus ratios favor dominance by blue-green algae in lake phytoplankton. Science 221: 669-671.
113. _. 1984. Phosphorus vs. nitrogen limitation in the marine environment. Limnol. Oceanogr. 29: 1149-1160.
114. _, AND M. J. ATKINSON. 1984. Phosphorus limitation of net production in confined aquatic ecosystem. Nature 207: 626-627.
115. _, G. D. TILMAN, AND J. C. NEKOLA. 1999. Eutrophication: Impacts of excess nutrient inputs on freshwater, marine, and terrestrial ecosystems. Environ. Pollut. 100: 179-196.
116. STAL, L., AND OTHERS. 2003. BASCI: Baltic Sea cyanobacteria. An investigation of the structure and dynamics of water blooms of cyanobacteria in the Baltic Sea - response to a changing environment. Cont. Shelf Res. 23: 1695-1714.
117. STANLEY, D. W. 1993. Long-term trends in Pamlico River Estuary nutrients, chlorophyll, dissolved oxygen, and watershed nutrient production. Water Resources Res. 29: 2651-2662.
118. SUNDBY, B., C. GOBEIL, N. SILVERGERB, AND A. MUCCI. 1992. The phosphorus cycle in coastal marine sediments. Limnol. Oceanogr. 37: 1129-1145.
119. TAYLOR, D. I., S. W. NIXON, S. L. GRANGER, AND B. A. BUCKLEY. 1995b. Impacts of different forms of nutrients on the roles of coastal lagoons as nutrient sources or sinks - a mesocosms study. Ophelia 42: 353-370.
120. _, J. P. MCMAHON, AND H. J. LIN. 1995a. Response of coastal lagoon plant communities to different forms of nutrient enrichment - a mescosm experiment. Aquat. Bot. 52: 19-34.
121. TURNER, R. E., N. QURESHI, N. N. RABALAIS, Q. DORTCH, D. JUSTIC, R. F. SHAW, AND J. COPE. 1998. Fluctuating silicate:nitrate ratios and coastal plankton food webs. Proc. Natl. Acad. Sci. USA 95: 13048-13051.
122. TYRREL, T. 1999. The relative influences of nitrogen and phosphorus on oceanic primary production. Nature 400: 525-531.
123. VAN RAAPHORST, W., P. RUARDIJ, AND A. G. BRINKMAN. 1988. The assessment of benthic phosphorus regeneration in an estuarine ecosystem model. Neth. J. Sea Res. 22: 23-36.
124. VINCE, S., AND I. VALIELA. 1973. The effects of ammonium and phosphate enrichment on chlorophyll a, pigment ratio, and species composition of phytoplankton of Vineyard Sound. Mar. Biol. 19: 69-73.
125. VITOUSEK, P. M., AND R. W. HOWARTH. 1991. Nitrogen limitation on land and sea: How can it occur? Biogeochemistry 13: 87-115.
126. _, AND OTHERS. 1997. Human alteration of the global nitrogen cycle: Causes and consequences. Ecol. Issues 1: 1-15.
127. _, AND OTHERS. 2002. Towards an ecological understanding of biological nitrogen fixation. Biogeochemistry 57/58: 1-45.
128. Vollenweider, R. A. 1975. Input-output models. Schweiz. Z. Hydrol. 37: 53-84.
129. _. 1976. Advances in defining critical loading levels of phosphorus in lake eutrophication. Mem. Inst. Ital. Idrobiol. 33: 53-83.
130. WALLSTROM, K., S. JOHANSSON, AND U. LARSSON. 1992. Effects of nutrient enrichment on planktonic blue-green algae in the Baltic Sea. Acta Phytogeorg. Suec. 78: 25-31.
131. 2 in the subtropical North Pacific Ocean. Nature 412: 635-638.