SAV Home > 2007 SAV Report > Species and Ground Surveyors Key


Zm Zostera marina (eelgrass)
Rm Ruppia maritima (widgeon grass)
C Chara sp. (muskgrass)
Cd Ceratophyllum demersum (coontail)
Cl Callitriche sp. (water-starwort)
Ec Elodea canadensis (common elodea)
Ed Egeria densa (water-weed)
Hd Heteranthera dubia (water stargrass)
Hv Hydrilla verticillata (hydrilla)
Ms Myriophyllum spicatum (Eurasian watermilfoil)
N Najas sp. (naiad)
Nfl Najas flexilis (northern naiad)
Ngr Najas gracillima (slender naiad)
Ngu Najas guadalupensis (southern naiad)
Nm Najas minor
Nt Nitella sp. (muskgrass)
Pcr Potamogeton crispus (curly pondweed)
Pe Potamogeton epihydrus (leafy pondweed)
Pn Potamogeton nodosus (American pondweed)
Ppc Stuckenia pectinata (sago pondweed)(Potamogeton pectinatus)
Ppf Potamogeton perfoliatus (redhead-grass)
Ppu Potamogeton pusillus (slender pondweed)
S Sparganium sp. (bureed)
Tn Trapa natans (water chestnut)
Va Vallisneria americana (wild celery)
Zp Zannichellia palustris (horned pondweed)
U Unknown species composition


Baltimore County Department of Environmental Protection and Resource Management
Maryland Department of Natural Resources
Multiple Surveyors
National Oceanic and Atmospheric Administration
National Park Service
United States Fish and Wildlife Service
United States Geological Survey
University of Maryland Center for Environmental Science
Virginia Department of Game and Inland Fisheries
Virginia Institute of Marine Science

2007 SAV Density Class Key

 0 - 10%
 10- 40%
 40 - 70%
 70 - 100%


2007 Comparison Map Key

  2007 SAV
  2006 SAV
  SAV both years
  Regions that were not fully mapped in 2006

Each bed is identified with an unique two letter (A,B,C,...,AA,BA,CA,...) and one number (1-4) designation. The numbers represent the density classification discussed in the text, i.e., 1 = <10%; 2= 10-40%; 3= 40-70%; 4= 70-100%.