Abstract
Coastal wetlands are dynamic ecosystems subject to the manipulative powers of both humans and sea. Areal changes in the tidal wetlands of Delaware were monitored over a six year period with color and color infrared aerial photography. Wetland changes were interpreted directly from the photography and were classified according to natural and legal categories of change. Human activities in tidal wetlands destroyed an average 8.1 ha of wetlands annually from 1973 to 1979. During the same period 3.9 ha of wetlands were eroded and 2.8 ha of wetlands were formed annually by natural processes. A total net loss of 55.1 ha of wetlands was estimated for the six year period. The enactment of state and federal legislation protecting wetlands in 1972–1973 resulted in a decrease of wetlands loss in Delaware from an average of 179.7 ha yr−1 from 1954 to 1971 to the 8.1 ha yr−1 determined by this study. The dynamic nature of these wetlands exemplifies the need for frequent monitoring and remapping, if an effective and accurate management program is to remain in operation
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Literature cited
Anderson, R. R., and F. J. Wobber. 1973. Wetlands mapping in New Jersey.Photogram. Eng. 39:353–358.
Bartlett, D. S., V. Klemas, O. W. Crichton, and G. R. Davis. 1976. Low-cost, aerial photographie inventory of tidal wetlands. Final Report to DNREC, Dover, DE. 29 pp.
Bartlett, D. S., and V. Klemas. 1981. In situ spectral reflectance studies of tidal wetland grasses.Photogram. Eng. Remote Sensing 47:1695–1703.
Gosselink, J. G., E. P. Odum, and R. M. Pope. 1974. The value of the tidal marsh. Center for Wetland Resources, Louisiana State University, Baton Rouge, LA. 30 pp.
Gosselink, J. G., and R. H. Baumann. 1980. Wetland inventories: Wetland loss along the United States coast. Pages 173–187in A. R. Orme, D. B. Prior, N. P. Psuty, and H. J. Walker (eds.) Coasts under stress. Annals of Geomorphology, Supplementband 34. Berlin.
Klemas, V., F. C. Daiber, D. S. Bartlett, O. W. Crichton, and A. O. Fornes. 1974. Inventory of Delaware's wetlands.Photogram. Eng. 40:433–439.
Lesser, C. A. 1971. Memo to Secretary Austin N. Heller from Charles Lesser RE 1971 wetland inventory (corrected). DNREC, Dover, DE. 3 pp.
Odum, E. P. 1979. The value of wetlands: A hierarchical approach. Pages 16–25in P. E. Greeson, J. R. Clark, and J. E. Clark (eds.) Wetland functions and values: The state of our understanding. American Water Resources Association, Minneapolis, MN.
Reimold, R. J., and M. A. Hardisky. 1979. Nonconsumptive use values of wetlands. Pages 558–564in P. E. Greeson, J. R. Clark, and J. E. Clark (eds.) Wetland functions and values: The state of our understanding. American Water Resources Association, Minneapolis, MN.
Stumpf, R. P. 1981. The process of sedimentation in a salt marsh. Master's thesis, University of Delaware, Newark, DE. p. 125.
US Fish and Wildlife. 1953. Wetlands of Delaware. Office of River Basin Studies, Boston, MA. 22 pp.
Vaughn, G. F. 1962. Land use in Delaware. Division of Urban Affairs, University of Delaware Circular No. 33. 12 pp.
Weller, M. W. 1979. Wetland habitats. Pages 210–234in P. E. Greeson, J. R. Clark, and J. E. Clark (eds.) Wetland functions and values: The state of our understanding. American Water Resources Association, Minneapolis, MN.
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Hardisky, M.A., Klemas, V. Tidal wetlands natural and human-made changes from 1973 to 1979 in Delaware: Mapping techniques and results. Environmental Management 7, 339–344 (1983). https://doi.org/10.1007/BF01866916
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DOI: https://doi.org/10.1007/BF01866916