Objectives | Funding | Background | People
Identify and delineate coastal marshes (CT and north shore of Long Island, NY) and distinguish various types of marsh vegetation using moderate spatial resolution public domain satellite imagery and high spatial resolution commercial remote sensing imagery combined with in situ field studies. These datasets and protocols will provide coastal resource managers, municipal officials and researchers a standardized baseline inventory of marsh location and extent for current land management and long term monitoring, as well as a set of recommended guidelines for remote sensing data collection for marsh inventory and analysis.
Coastal wetlands are a critical component of the Long Island Sound ecosystem. However, over the past century, a significant amount of these wetlands has been lost due to development, filling, and dredging, or damaged due to anthropogenic disturbance and modification. Global sea level rise is also likely to have a significant impact on the condition and health of coastal wetlands, particularly if the wetlands have no place to migrate due to dense coastal development. In addition to physical loss of marshes, the species composition of marsh communities is changing. Spartina alterniflora (salt cordgrass) and Spartina patens (salt marsh hay), once the dominant species of New England salt marshes, are being replaced by monocultures of Phragmites australis (common reed) in CT marshes; anecdotal evidence identifies ~50% of tidal and brackish marshes in CT as sites of P. australis invasion. P. australis outcompetes other marsh species in areas with increased fresh water, nitrogen and sediments and is positively correlated with marsh fragmentation. In response to the increase of P. australis in many marshes, The Nature Conservancy, the CT DEP and other organizations have instituted efforts (commencing in the 1980s) to restore marsh health, including the eradication of P. australis in some areas. The response of marshes to eradication has included both an increase of non-Phragmites marsh species and P. australis reinvasion.
With the mounting pressures on coastal wetland areas, it is becoming increasingly important to identify and inventory the current extent and condition of coastal marshes located on the Long Island Sound estuary, implement a cost effective way to track changes in the condition of wetlands over time, and monitor the effects of habitat restoration and management.
Dr. Daniel L. Civco, PI |
Dr. Martha Gilmore, PI |
James D. Hurd |
Emily Hoffhine Wilson |
Sandy Prisloe |