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The Chesapeake Bay is home to a variety of species of SAV. The Potomac River in particular has a distinct salinity gradient that becomes progressively marine as one moves towards the mouth of the river (Fig. ). This salinity gradient could be correlated with changes in the SAV microbiome. The microbial community could also, however, be associated with the location, the temperature, the host species, or any number of environmental attributes. The goal of this study was to characterize the SAV microbiome and determine associated factors from the environment that are connected to microbial community patterns.    Notes:   Effect of Elodea nuttallii Roots on Bacterial Communities and MMHg Proportion in a Hg Polluted Sediment\cite{Regier_2012}shows that microcosm sediments with elodea roots harbor a different community than those without, and that mercury methylation is increased in rhizosphere communities  Effect of different plant species on nutrient removal and rhizospheric microorganisms distribution in horizontal-flow constructed wetlands.\cite{Meng_2013}found that denitrifiers were dominant organisms in 3 different plant species