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Investigations of the availability and survival of submersed aquatic vegetation propagules in the tidal Potomac River

Estuaries

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, , , , and

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Abstract

The establishment of submersed aquatic vegetation (SAV) at unvegetated sites in the freshwater tidal Potomac River was limited primarily by factors other than propagule availability. For two years, traps were used to quantify the amount of plant material reaching three unvegetated sites over the growing season. The calculated flux values provided a gross estimate of the flux of propagules that could potentially survive if other site factors were suitable. The mean flux of Hydrilla verticillata and all other species (??? 0.01 gdw m-2 d-1) appeared sufficient to favor the establishment of vegetation, particularly considering the high viability (70-100%) of whole plants and fragments under controlled conditions. However, median water clarity values (i.e., for light attenuation, Secchi depth, total suspended solids, and chlorophyll a) were below SAV restoration goals at all unvegetated sites. Additionally, sediments from unvegetated sites showed a potential for nitrogen limitation of the growth of H. verticillata. Our findings support the hypothesis that in the tidal Potomac River, water clarity and nutrient (especially nitrogen) levels in sediment are key to plant community establishment.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Investigations of the availability and survival of submersed aquatic vegetation propagules in the tidal Potomac River
Series title:
Estuaries
Volume
24
Issue:
3
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Estuaries
First page:
407
Last page:
424
Number of Pages:
18