||Virginia Inst. of Marine Science, Gloucester Point.;Environmental Protection Agency, Annapolis, MD. Chesapeake Bay Program.;National Oceanic and Atmospheric Administration, Rockville, MD.;Maryland Dept. of Natural Resources, Annapolis.;Fish and Wildlife Service, Washington, DC.
The distribution of submerged aquatic vegetation, principally rooted vascular macrophytes, in the Chesapeake Bay, its tributaries, and Chincoteague Bay was mapped during May to October 1991 at a scale of 1:24,000 using black and white aerial photography. In 1991, the Chesapeake Bay had 25,623 hectares of SAV, compared to 24,296 hectares in 1990, with 2,158 hectares (8.4 percent), 11,664 hectares (45.5 percent), and 11,802 hectares (46.1 percent) occurring in the Upper, Middle, and Lower Bay zones, respectively.