Tidal Wetlands Losses
The Long Island Tidal Wetlands Trends Analysis measures wetlands loss and changes in marsh condition within the Long Island Sound, Peconic, and South Shore estuaries including all or parts of Westchester, Bronx, Queens, Nassau, and Suffolk Counties. The results of this project are intended for use by environmental managers, conservation advocates and elected officials across a variety of regulatory agencies, environmental organizations, and governments.
Overall, Long Island's estuaries have lost approximately 2700 acres of native intertidal, high marsh, and coastal fresh marsh communities over the study period of 34 years (1974 and 2005/2008). This acreage accounted for between 10 and 100 percent loss of individual marshes.
Marsh loss was observed as:
- The conversion of high marsh to intertidal marsh, and retreat of the seaward edge of the marsh,
- The formation of pannes, ponds, and mudflats, as well as the widening of ditches within marshes, and
- The intrusion of Phragmites australis
The complete report is available:
- Long Island Tidal Wetlands Trends Part 1 (PDF, 3.9 MB)
- Long Island Tidal Wetlands Trends Part 2 (PDF, 4.6 MB)
- Long Island Tidal Wetlands Trends Part 3 (PDF, 3 MB)
- Long Island Tidal Wetlands Trends Part 4 (PDF, 3.7 MB)
- Long Island Tidal Wetlands Trends Appendix I Maps (PDF, 2.4 MB)
- Long Island Tidal Wetlands Trends Appendix II Data Table (PDF, 529 KB)
See also a letter from DEC Commissioner Joe Martens regarding repairs and improvements to the Bay Park wastewater treatment plant (PDF) 891 KB and how these will reduce nitrogen discharges into Hempstead Bay, Long Island.