Estuaries

, Volume 18, Issue 4, pp 598–621 | Cite as

The relationships among man’s activities in watersheds and estuaries: A model of runoff effects on patterns of estuarine community metabolism

  • Charles S. Hopkinson
  • Joseph J. Vallino
Article

Abstract

Activities of man in rivers and their watersheds have altered enormously the timing, magnitude, and nature of inputs of materials to estuaries. Despite an awareness of large-scale, long-term changes in river-estuarine watersheds, we do not fully understand the consequences to estuarine ecosystems of these activities. Deforestation, urbanization, and agriculturalization have changed the timing and nature of material inputs to estuaries. Conversion of land from forest to almost any other land use promotes overland flow of storm runoff; increases the timing, rate and magnitude of runoff; and increases sediment, organic matter, and inorganic nutrient export. It has been estimated that total organic carbon levels in rivers have increased by a factor of 3–5 over natural levels. Man’s activities have also changed the magnitude of particulate organic carbon relative to dissolved organic carbon export and the lability of the organic matter. Historically, rivers and streams had different features than they do today. Two of man’s activities that have had pronounced effects on the timing and quality of river water are channelization and damming. Agricultural drainage systems, channelized and deepened streams, and leveeing and prevention of overbank flooding have had the combined effect of increasing the amplitude and rate of storm runoff, increasing sediment load, increasing nutrient delivery downstream, and decreasing riparian wetland productivity. Dams on the other hand have altered natural discharge patterns and altered the downstream transfer of sediments, organic matter, and nutrients. Patterns of estuarine community metabolism are sensitive to variations, in the timing, magnitude, and quality of material inputs from watersheds. The autotrophic-heterotrophic nature of an estuary is determined by three primary factors: the ratio of inorganic to organic matter inputs, water residence time, and the overall lability of allochthonous organic matter inputs. A simulation model is used to explore the effects of man’s activities in watersheds on the spatial patterns of production and respiration in a generalized estuarine system. Examined are the effects of variations in the ratios of inorganic and organic nitrogen loading, the residence time of water in the estuary, the degradability of allochthonous organic matter, and the ratio of dissolved to particulate organic matter inputs. Simulations suggest that the autotrophic-heterotrophic balance in estuaries is more sensitive to variations in organic matter loading than inorganic nutrient loading. Water residence time and flocculation-sedimentation of organic matter are two physical factors that most effect simulated spatial patterns of metabolism in estuaries.

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Literature Cited

  1. Anderson, T. R. 1992. Modelling the influence of food C:N ratio, and respiration on growth and nitrogen excretion in the marine zooplankton and bacteria.Journal of Plankton Research 14:1645–1671.CrossRefGoogle Scholar
  2. Ascher, U., J. Christiansen, andR. D. Russell. 1981. Collocation software for boundary-value ODEs.Association for Computing Machinery, Transactions on Mathematical Software 7:209–222.CrossRefGoogle Scholar
  3. Attiwell, P. 1991. The disturbance of forested watersheds, p. 193–213.In H. Mooney, E. Medina, D. Schindler, E.-D. Schulze, and B. Walker (eds.) SCOPE 45:Ecosystem Experiments. John Wiley and Sons. New York.Google Scholar
  4. Azam, F., T. Fenchel, J. G. Field, J. S. Gray, L. A. Meyer-Reil, andF. Thingstad. 1983. The ecological role of water-column microbes in the sea.Marine Ecology Progress Series 10:257–263.CrossRefGoogle Scholar
  5. Bader, G. andU. Ascher. 1987. A new basis implementation for a mixed order boundary value ODE solver.Society for Industrial and Applied Mathematics Journal of Scientific and statistical Computing 8:483–500.Google Scholar
  6. Balsis, B. R., D. Alderman, I. Buffam, R. Garritt, C. Hopkinson, and J. Vallino. 1995. Total system metabolism at the Palm Island estuarine system.,Biological Bulletin In Press.Google Scholar
  7. Bormann, F. H. andG. Likens 1981. Pattern and Process in a Forested Ecosystem. Springer-Verlag, New York.Google Scholar
  8. Brinson, M., M. Bradshaw, andE. Kane 1984. Nutrient assimilative capacity of an alluvial floodplain swamp.Journal of Applied Ecology 21:1041–1057.CrossRefGoogle Scholar
  9. Brinson, M., B. Swift, R. Plantico, and J. Barclay. 1981. Riparian ecosystems: Their ecology and status. United States Fish and Wildlife Service, Biological Service Program, FWS/OBS-81/17, Washington, D.C.Google Scholar
  10. Burelli, M. 1992. Nile delta sinking.Alternatives 18:1–9.Google Scholar
  11. Caron, D. A. andJ. C. Goldman 1988. Dynamics of protistan carbon and nutrient cycling.Journal of Protozoology 35:247–249.Google Scholar
  12. Childers, D. L. andH. N. McKellar, Jr. 1987. A simulation of saltmarsh water column dynamics.Ecological Modelling 36: 211–238.CrossRefGoogle Scholar
  13. Cook, E. 1976. Man, Energy and Society. W. H. Freeman and Co., San Francisco.Google Scholar
  14. Conner, W. andJ. Day 1976. Productivity and composition of a bald cypress-water tupelo site and a bottomland hardwood site in a Louisiana swamp.American Journal of Botany 63:1354–1365.CrossRefGoogle Scholar
  15. Day, J., T. Butler, andW. Conner. 1977. Productivity and nutrient export studies in a cypress swamp and lake system in Louisiana, p. 255–269.In M. Wiley (ed.) Estuarine Processes, Vol. 2. Academic Press, New York.Google Scholar
  16. Dixon, R., S. Brown, R., Houghton, A. Solomon, M. Trexler, andJ. Wisniewski. 1994. Carbon pools and flux of global forest ecosystems.Science 263:185–190.CrossRefGoogle Scholar
  17. Dunne, T. andL. Leopold. 1978. Water in Environmental Planning. W. H. Freeman and Co, New York.Google Scholar
  18. Elder, J. 1985. Nitrogen and phosphorus speciation and flux in a large Florida river-wetland system.Water Resources Research 2:443–453.Google Scholar
  19. Evans, G. T. andJ. S. Parslow 1985. A model of annual plankton cycles.Biological Oceanography 3:327–347.Google Scholar
  20. Fasham, M. J. R., H. W. Ducklow, andS. M. McKelvie. 1990. A nitrogen-based model of plankton dynamics in the ocean mixed layer.Journal of Marine Research 48:591–639.Google Scholar
  21. Fry, B., M. Hullar, B. Peterson, S. Saupe, andR. Wright. 1992. DOC production in a salt marsh estuary.Archiv Fuer Hydrobiologie 37:1–8.Google Scholar
  22. Hagström, A., F. Azam, A. Anderson, J. Wikner, andF. Rassoulzadegan. 1988. Microbial loop in an oligotrophic pelagic marine ecosystem: Possible roles of cyanobacteria and nanoflagellates in the organic fluxes.Marine Ecology Progress Series 49:171–178.CrossRefGoogle Scholar
  23. Hopkinson, C. S. andJ. W. Day 1980a. Modeling hydrology and eutrophication in a Louisiana swamp forest ecosystem.Environmental Management 4:325–336.CrossRefGoogle Scholar
  24. Hopkinson, C. S. andJ. W. Day 1980b. Modeling the relationship between development and storm water and nutrient runoff.Environmental Management 4:315–324.CrossRefGoogle Scholar
  25. Howarth, R., J. Fruci, andD. Sherman. 1991. Inputs of sediment and carbon to an estuarine ecosystem: Influence of land use.Ecological Applications 1:27–39.CrossRefGoogle Scholar
  26. Ittekkot, V. 1988. Global trends in the nature of organic matter in river suspensions.Nature 332:436–438.CrossRefGoogle Scholar
  27. Ittekkot, V. andR. Laane. 1991. Fate of riverine particulate organic matter, p. 233–242.In E. Degens, S. Kempe, and J. Richev (eds.), Scope 42: Biogeochemistry of Major World Rivers. John Wiley and Sons, New York.Google Scholar
  28. Kempe, S. 1984. Sinks of the anthropogenically enhanced carbon cycle in surface fresh waters.Journal of Geophysical Research 89 D3:4657–4676.CrossRefGoogle Scholar
  29. Kempe, S., M. Pettine, andG. Cauwet. 1991. Biogeochemistry of European rivers, p. 169–211.In E. Degens, S. Kempe, and J. Richey (eds.) Scope 42: Biogeochemistry of Major World Rivers. John Wiley and Sons, New York.Google Scholar
  30. Likens, G. andF. Bormann. 1975. Nutrient-hydrologic interactions, p 1–63.In A. Hasler (ed.) Coupling of Land and Water Systems. Springer-Verlag, New York.Google Scholar
  31. Maloney, C. andJ. Field 1991. The size-based dynamics of plankton food webs. I. A simulation model of carbon and nitrogen flows.Journal of Plankton Research 13:1003–1038.CrossRefGoogle Scholar
  32. Maloney, C. L., J. G. Field, andM. I. Lucas. 1991. The sizebased dynamics of plankton food webs. II. Simulations of three contrasting southern Benguela food webs.Journal of Plankton Research 13:1039–1092.CrossRefGoogle Scholar
  33. Meade, R. 1982. Sources, sinks and storage of river sediment in the Atlantic drainage of the United States.Journal of Geology 90:235–252.Google Scholar
  34. Meybeck, M. 1982. Carbon, nitrogen and phosphorus transport by world rivers.American Journal of Science 282:401–450.Google Scholar
  35. Milliman, J., Q. Yun-Shan, B. Mei-e, andY. Saito 1987. Man’s influence on the erosion and transport of sediment by Asian rivers: The Yellow River (Huanghee) example.Journal of Geology 95:751–762.CrossRefGoogle Scholar
  36. Mitsch, W., C. Dorge, andJ. Wiemhoff. 1979. Ecosystem dynamics and a phosphorus budget of an alluvial cypress swamp in southern Illinois.Ecology 60:1116–1124.CrossRefGoogle Scholar
  37. Naiman, R. 1986. Ecosystem alteration of boreal forest streams by beaver.Ecology 67:1254–1269.CrossRefGoogle Scholar
  38. Omernik, J. 1976. The influence of land use on stream nutrient levels. United States Environmental Protection Agency 600/3-76-014.Google Scholar
  39. Petr, T. 1986. The Volta River system, p. 163–199.In B. Davies and K. Walker (eds.) The Ecology of River Systems. W. Junk Publishers, Dordrecht, The Netherlands.Google Scholar
  40. Richey, J., A. Devol, J. Hedges, B. Forsber, R. Victoria, L. Martinellis, andN. Ribeiro. 1990. Distribution and flux of carbon in the Amazon River.Limnology and Oceanography 35: 352–371.Google Scholar
  41. Schlesinger, W. andJ. Melack 1981. Transport of organic carbon in the world’s rivers.Tellus 33:172–187.CrossRefGoogle Scholar
  42. Sedell, J. andJ. Froggett 1984. Importance of streamside forests to large rivers: The isolation of the Williamette River, Oregon, USA, from its floodplain.Internationale Vereinigung für theoretische und angewandte Limnologie, Vehandlungen 22:1828–1834.Google Scholar
  43. Shalash, S. 1982. Effects of sedimentation on the storage capacity of the High Aswan Dam reservoir.Hydrobiologia 92:623–639.Google Scholar
  44. Sharaf-El-Din, S. 1977. Effect of the Aswan High Dam on the Nile flood and on the estuarine and coastal circulation pattern along the Mediterranean Egyptian coast.Limnology and Oceanography 22:194–207.Google Scholar
  45. Slaymaker, O. 1982. Land use effects on sediment yield and quality.Hydrobiologia 91:93–109.Google Scholar
  46. Sotille, W. 1973. Studies of microbial production and utilization of dissolved organic carbon in a Georgia salt marsh estuarine ecosystem. Ph.D. Dissertation, University of Georgia, Athens, Georgia.Google Scholar
  47. Stanley, D. 1988. Subsidence in the northeastern. Nile delta: Rapid rates, possible causes and consequences.Science 240: 497–500.CrossRefGoogle Scholar
  48. Stanley, D. andA. Warne 1992. Nile delta: Recent geological evolution and human impact.Science 260:628–634.CrossRefGoogle Scholar
  49. Tamm, C. 1991. What ecological lessons can we learn from deforestation processes in the past? p. 45–58.In H. A. Mooney, E. Medina, D. Schindler, E. Schulze, and B. Walker, (eds.), Scope 45: Ecosystem Experiments. John Wiley and Sons. New York.Google Scholar
  50. Taylor, A. H. andI. Joint. 1990. A steady-state analysis of the ‘microbial loop’, in stratified systems.Marine Ecology Progress Series 59:1–17.CrossRefGoogle Scholar
  51. United States Soil Conservation Service. 1972. Hydrology, Section 4. National Engineering Handbook. Washington. D.C.Google Scholar
  52. Van Bennekom, A. and W. Salomons. 1981. Pathways of nutrients and organic matter from land to ocean through rivers, p. 33–51.,In J. Martin, J. Burton, and D. Eisma (eds.) River Inputs to the Ocean System. UNESCO-UNEP, SCOR Workshop, United Nations, New York.Google Scholar
  53. Vollenweider, R. 1968. Scientific basis of eutrophication of lakes and flowing waters with emphasis on P and N as causattive factors. DAS/CSI/Rept 68. Paris.Google Scholar
  54. Vörösmarty, C. J. andT. C. Loder, III. 1994. Spring-neap tidal contrasts and nutrient dynamics in marsh-dominated estuaries: The spectrum effect.,Estuaries 17:537–551.CrossRefGoogle Scholar
  55. Wadia, W. 1982. Effect of regulation of the Nile River on the bioproductivity of southeastern Mediterranean Sea.Journal of Ichthyology 22:164–167.Google Scholar
  56. Wharton, C., W. Kitchens, E. Pendleton, and T. Sipe. 1982. The ecology of bottomland hardwood swamps of the southeast: A community profile, United States Fish and Wildlife Service Biological Services Program, FWS/OBS-81/37.Google Scholar
  57. Wischmeier, W. andD. Smith 1978. Predicting rainfall erosion losses—A guide to conservation planning. Agricultural Handbook 537. United States Department of Agriculture, Washington, D.C.Google Scholar
  58. Wollast, R. 1983. Interactions in estuaries and coastal waters, p. 385–410.In B. Bolin and R. Cook (eds.), The Major Biogeochemical Cycles and Their Interactions. SCOPE 21. John Wiley and Sons. New York.Google Scholar
  59. Wolman, M. 1967. A cycle of sedimentation and erosion in urban river channels.Geografiska Annaler 49A:385–395.CrossRefGoogle Scholar
  60. Wright, R., R. Coffin, andM. Lebo. 1987. Dynamics of planktonic bacteria and heterotrophic microflagellates in the Parker estuary, northern Massachusetts.Continental Shelf Science 7:1383–1397.CrossRefGoogle Scholar
  61. Yarbro, L. 1983. The influence of hydrologic variations on phosphorous cycling and retention in a swamp stream ecosystem, p. 223–245.In T. Fontaine and S. Bartell, (eds.) Dynamics of Lotic Ecosystems. Ann Arbor Science, Ann Arbor, Michigan.Google Scholar

Copyright information

© Estuarine Research Federation 1995

Authors and Affiliations

  • Charles S. Hopkinson
    • 1
  • Joseph J. Vallino
    • 1
  1. 1.Marine Biological LaboratoryThe Ecosystems CenterWoods Hole

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