Investigations of the Production, Transport, and Survival of Monoecious Hydrilla Propagules in the Tidal Potomac River

The submersed aquatic vegetation (SAV) of the freshwater tidal Potomac River has a history of dramatic change in abundance and distribution. Following a four-decade absence in the tidal river (between Chain Bridge and Quantico, VA; Figure 1), SAV reappeared in 1983 in the upper tidal reach and, by 1...

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Bibliographic Details
Main Authors: McFarland, Dwilette G, Barko, John W
Format: Report
Language:English
Subjects:
AQUATIC BIOLOGY
AQUATIC ORGANISMS
AQUATIC PLANTS
Biology
BRIDGES
CHAINS
FRESH WATER
GROWTH(PHYSIOLOGY)
HETERANTHERA DUBIA
HYDRILLA
HYDRILLA VERTICILLATA
Hydrology, Limnology and Potamology
LOSSES
MYRIOPHYLLUM SPIICATUM
POTOMAC RIVER
PRODUCTION
RIVERS
SURVIVAL(PERSONNEL)
TIDES
VALLISNERIA AMERICANA
VEGETATION
VIRGINIA
Water Pollution and Control
WETLANDS
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Summary:The submersed aquatic vegetation (SAV) of the freshwater tidal Potomac River has a history of dramatic change in abundance and distribution. Following a four-decade absence in the tidal river (between Chain Bridge and Quantico, VA; Figure 1), SAV reappeared in 1983 in the upper tidal reach and, by 1986, had spread farther downstream into the lower tidal reach as well (Paschal et al. 1982; Haramis and Carter 1983; Carter, Paschal, and Bartow 1985; Carter and Rybicki 1986,1990; U.S. Geological Survey 1994, unpublished). Three submersed species, Vallisneria americana Michx., Myri- ophyllum spicatum L., and Heteranthera dubia (Jacq.) MacM., were dominant between 1983 and 1985; but by 1986, monoecious Hydrilla verticillata (L.f.) a newly established exotic species (first documented near Dyke Marsh, Virginia, in 1982; Steward et al. 1984), had become most abundant. Since 1986, SAV in portions of the tidal river has declined, with the upper tidal reach experiencing the most severe losses (U.S. Geological Survey 1994, unpublished).