Abstract
Extensive restoration efforts in southern California coastal wetlands highlight several challenges for urban salt marsh restoration, including: habitat isolation and fragmentation, impacts from exotic species, the loss of transitional upland habitats, and other alterations to hydrologic and sediment dynamics. Habitat isolation impairs colonization by dispersal-limited plants, so planting becomes essential to achieve diverse salt marshes. Low species richness slows the development of salt marsh functions (e.g., biomass and nitrogen accumulation) in southern California. A variety of exotic species have invaded the upper reaches of salt marshes in southern California, most commonly in marshes with hydrological modifications. The replacement of gradual slopes between wetlands and uplands by sharp transitions abutting urban development limits our ability to restore rare plant and animal populations. Where hydrologic connections are impaired by roads and other structures, the natural migration of channels is constrained, and sediment dynamics often lead to lagoon mouth closure.
A case study from Tijuana River National Estuarine Research Reserve (hereafter, Tijuana Estuary) further illustrates a specific lesson for urban salt marsh restoration concerning watershed issues and sediment dynamics. In the south arm of Tijuana Estuary, watershed urbanization, along with local climate, topography, and soils, has resulted in extreme rates of sediment accumulation. Sedimentation rates in a salt marsh in the south arm of the estuary ranged from 10 to 30 cm over a single winter (1994–95), substantially greater than historic sedimentation rates in the estuary or rates from other coastal wetlands with storm sedimentation. Sediment buried salt marsh vegetation in place and is converting intertidal salt marsh to uplands. These impacts illustrate the need to consider watershed issues and sediment control in managing and restoring urban salt marshes.
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References
Adam, P. (2002) Saltmarshes in a time of change. Environmental Conservation 29, 39–61.
Baumann, R.H., Day, J.W., Jr. and Miller, C.A. (1984) Mississippi deltaic wetland survival: Sedimentation versus coastal submergence. Science 224, 1093–1095.
Bricker-Urso, S., Nixon, S.W., Cochran, J.K., Hirschberg, D.J. and Hunt, C. (1989) Accretion rates and sediment accumulation in Rhodes Island salt marshes. Estuaries 12, 300–317.
Brockerhoff, M.P. (2000) An urbanizing world. Population Bulletin 55, 3–44.
Cahoon, D.R., Lynch, J.C. and Powell, A.N. (1996) Marsh vertical accretion in a southern California estuary, U.S.A. Estuarine, Coastal and Shelf Science 43, 19–32.
Callaway, J.C. (in press) The challenge of restoring functioning salt marsh ecosystems. Journal of Coastal Research.
Callaway, J.C. and Zedler, J.B. (1998) Interactions between a salt marsh native perennial (Salicornia virginica) and an exotic annual (Polypogon monspeliensis)under varied salinity and hydroperiod. Wetlands Ecology and Management 5, 179–194.
Callaway, J.C., DeLaune, R.D. and Patrick, W.H., Jr. (1997) Sediment accretion rates from four coastal wetlands along the Gulf of Mexico. Journal of Coastal Research 13, 181–191.
Callaway, J.C., Sullivan, G. and Zedler, J.B. (2003) Species-rich plantings increase biomass and nitrogen accumulation in a wetland restoration experiment. Ecological Applications 13, 1626–1639.
Casagrande, D.G., ed. (1997) Restoration of an Urban Salt Marsh: An Interdisciplinary Approach. Yale University RIS Publishing, New Haven, CT.
Chmura, G.L. and Kosters, E.C. (1994) Storm deposition and 137Cs accumulation in fine-grained marsh sediments of the Mississippi Delta Plain. Estuarine, Coastal and Shelf Science 39, 33–44.
Courtemanche, R.P., Jr., Hester,M.W. and Mendelssohn, I.A. (1999) Recovery of a Louisiana barrier island marsh plant community following extensive hurricane-induced overwash. Journal of Coastal Research 15, 872–883.
DeLaune, R.D., Patrick, W.H., Jr. and Buresh, R.J. (1978) Sedimentation rates determined by 137Cs dating in a rapidly accreting salt marsh. Nature 275, 532–533.
Ehrenfeld, J.G. (2000) Evaluating wetlands within an urban context. Ecological Engineering 15, 253–265.
Forman, R.T.T. and Alexander, L.E. (1998) Roads and their major ecological effects. Annual Review of Ecology and Systematics 29, 207–231, C202.
Gee, G.W. and Bauder, J.W. (1986) Particle-size analysis. In Methods of Soil Analysis: Part I: Physical and Mineralogical Methods (A. Klute, ed.), pp. 383–411. American Society of Agronomy, Madison, WI.
Goodbred, S.L., Jr. and Hine, A.C. (1995) Coastal storm deposition: Salt-marsh response to a severe extratropical storm, March 1993, west-central Florida. Geology 23, 679–982.
Gray, A.J., Marshall, D.F. and Raybould, A.F. (1991) A century of evolution in Spartina anglica. Advances in Ecological Research 21, 1–62.
Greer, K. and Stow, D. (2003) Vegetation type conversion in Los Peñasquitos Lagoon, California: An examination of the role of watershed urbanization. Environmental Management 31, 489–503.
Hargis, T.G. and Twilley, R.R. (1994) Improved coring device for measuring soil bulk density in a Louisiana deltaic marsh. Journal of Sedimentary Research Section A: Sedimentary Petrology and Processes64, 681–683.
Hatton, R.S., DeLaune, R.D. and Patrick, W.H., Jr. (1983) Sedimentation, accretion, and subsidence in marshes of Barataria Basin, Louisiana. Limnology and Oceanography 28, 494–502.
Helenurm, K. and Parsons, L.S. (1997) Genetic variation and the reintroduction of Cordylanthus maritimus ssp. maritimus to Sweetwater Marsh, California. Restoration Ecology 5, 236–244.
Hensel, P.F., Day, J.W., Jr. and Didier, P. (1999)Wetland vertical accretion and soil elevation change in the Rhône River Delta, France: The importance of riverine flooding. Journal of Coastal Research 15, 668–681.
James, M.L. and Zedler, J.B. (2000) Dynamics of wetland and upland subshrubs at the salt marsh-coastal sage scrub ecotone. American Midland Naturalist 143, 298–311.
Keer, G.H. and Zedler, J.B. (2002) Salt marsh canopy architecture differs with the number and composition of species. Ecological Applications 12, 456–473.
Kuhn, N.L. and Zedler, J.B. (1997) Differential effects of salinity and soil saturation on native and exotic plants of a coastal salt marsh. Estuaries 20, 391–403.
Leonard, L.A., Hine, A.C., Luther, M.E., Stumpf, R.P. and Wright, E.E. (1995) Sediment transport processes in a west-central Florida open marine marsh tidal creek; the role of tides and extra-tropical storms. Estuarine, Coastal and Shelf Science 41, 225–248.
Letzsch, W.S. and Frey, R.W. (1980) Deposition and erosion in a Holocene salt marsh, Sapelo Island, Georgia. Journal of Sedimentary Petrology 50, 529–542.
Lindig-Cisneros, R. and Zedler, J.B. (2002) Halophyte recruitment in a salt marsh restoration site. Estuaries 26, 1174–1183.
MacDonald, K.B. (1990) South San Deigo Bay Enhancement Plan: Vol. 1. Resource Atlas: Marine Ecological Characterization, Bay History and Physical Environment. San Diego Unified Port District, San Diego, CA.
Mitsch, W.J. and Gosselink, J.G. (2000) Wetlands. 3rd edn. John Wiley, New York, NY.
Mudie, P.J. and Byrne, R. (1980) Pollen evidence for historic sedimentation rates in California coastal marshes. Estuarine and Coastal Marine Science 10, 305–316.
Nichols, F.H., Cloern, J.E., Luoma, S.N. and Peterson, D.H. (1986) The modification of an estuary. Science 231, 567–573.
Noe, G.B. (2002)Temporal variability matters: Effects of constant vs. varying moisture and salinity on germination. Ecological Monographs 72, 427–443.
Noe, G.B. and Zedler, J.B. (2001) Spatio-temporal variation of salt marsh seedling establishment in relation to the abiotic and biotic environment. Journal of Vegetation Science 12, 61–74.
Nyman, J.A., Crozier, C.R. and DeLaune, R.D. (1995) Roles and patterns of hurricane sedimentation in an estuarine marsh landscape. Estuarine, Coastal and Shelf Science 40, 665–679.
Nyman, J.A., DeLaune, R.D., Roberts, H.H. and Patrick, W.H., Jr. (1993) Relationship between vegetation and soil formation in a rapidly submerging coastal marsh. Marine Ecology Progress Series 96, 269–278.
Ojeda, L.R. (2001) Changing land use patterns in the Tijuana River Watershed and the conservation of transborder natural resources. In Is Globalization Overpowering Democracy? The Challenge for Ecology, Economy and Culture. Prague, Czech Republic, June 12-16, 2001. Institute of Landscape Ecology, Academy of Sciences of the Czech Republic, and the Czech Association for Landscape Ecology. Available at: http://www.uek.cas.cz/GlobDem/full text.htm.
Parsons, L.S. and Zedler, J.B. (1997) Factors affecting reestablishment of an endangered annual plant at a California salt marsh. Ecological Applications 7, 253–267.
Pethick, J.S. (1981) Long-term accretion rates on tidal salt marshes. Journal of Sedimentary Petrology 51, 521–577.
Rappaport, J. and Sachs, J.D. (2003) The United States as a coastal nation. Journal of Economic Growth 8, 5–46.
Redfield, A.C. (1972) Development of a New England salt marsh. Ecological Monographs 42, 201–237.
Reed, D.J. (1989) Patterns of sediment deposition in subsiding coastal salt marshes, Terrebonne Bay, Louisiana: The role of winter storms. Estuaries 12, 222–227.
Rejmánek, M., Sasser, C.E. and Peterson, G.W. (1988) Hurricane-induced sediment deposition in a Gulf coast marsh. Estuarine, Coastal and Shelf Science 27, 217–222.
Roman, C.T., Peck, J.A., Allen, J.R., King, J.W. and Appleby, P.G. (1997) Accretion of a New England (U.S.A.) salt marsh in response to inlet migration, storms, and sea-level rise. Estuarine, Coastal and Shelf Science 45, 717–727.
Ruiz, G.M., Fofonoff, P.W., Carlton, J.T., Wonham, M.J. and Hines, A.H. (2000) Invasion of coastal marine communities in North America: Apparent patterns, processes, and biases. Annual Review of Ecology and Systematics 31, 481–531.
Ryan, M., ed. (2003).Clean Water Act, 2nd edn. American Bar Association, Section of Environment, Energy, and Resources, Chicaco, IL.
Stevenson, J.C., Ward, L.G. and Kearney, M.S. (1986) Vertical accretion in marshes with varying rates of sea level rise. In Estuarine Variability (D.A. Wolfe, ed.), pp. 241–259. Academic Press, San Diego, CA.
United Nations. (2000) World Urbanization Prospects: The 1999 Revision. United Nations, New York, NY.
Ward, K.M., Callaway, J.C. and Zedler, J.B. (2003) Episodic colonization of an intertidal mudflat by native cordgrass (Spartina foliosa) at Tijuana Estuary. Estuaries 26, 116–130.
Weis, D.A., Callaway, J.C. and Gersberg, R.M. (2001) Vertical accretion rates and heavy metal chronologies in wetland sediments of the Tijuana Estuary. Estuaries 24, 840–850.
Williams, P.B. and Swanson, M.L. (1987) Tijuana Estuary Enhancement Hydrologic Analysis. California State Coastal Conservancy, Oakland, CA.
Zedler, J.B., ed. (2001) Handbook for Restoring Tidal Wetlands. CRC Press, Boca Raton, FL.
Zedler, J.B., Callaway, J.C. and Sullivan, G. (2001) Declining biodiversity: Why species matter and how their functions might be restored in Californian tidal marshes. Bioscience 51, 1005–1017.
Zedler, J.B., Nordby, C.S. and Kus, B.E. (1992) The Ecology of Tijuana Estuary, California: A National Estuarine Research Reserve. NOAA Office of Coastal Resource Management, Sanctuaries and Reserves Division, Washington, DC.
Zedler, J.B., Paling, E. and McComb, A. (1990) Differential salinity responses help explain the replacement of native Juncus kraussii by Typha orientalis in Western Australian salt marshes. Australian Journal of Ecology 15, 57–72.
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Callaway, J.C., Zedler, J.B. Restoration of urban salt marshes: Lessons from southern California. Urban Ecosystems 7, 107–124 (2004). https://doi.org/10.1023/B:UECO.0000036268.84546.53
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DOI: https://doi.org/10.1023/B:UECO.0000036268.84546.53