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Fate Of Macroalgae In Benthic Systems: Carbon And Nitrogen Cycling Within The Microbial Community, Amber K. Hardison, Elizabeth A. Canuel, Iris C. Anderson, Bart Veuger
Fate Of Macroalgae In Benthic Systems: Carbon And Nitrogen Cycling Within The Microbial Community, Amber K. Hardison, Elizabeth A. Canuel, Iris C. Anderson, Bart Veuger
VIMS Articles
High nutrient loading to coastal bays is often accompanied by the presence of bloom-forming macroalgae, which take up and sequester large amounts of C and N while growing. This pool is temporary, however, as nuisance macroalgae exhibit a bloom and die-off cycle, influencing the biogeochemical functioning of these systems in unknown ways. The objective of this study was to trace the C and N from senescing macroalgae into relevant sediment pools. A macroalgal die-off event was simulated by the addition of freeze-dried macroalgae (Gracilaria spp.), pre-labeled with stable isotopes (C-13 and N-15), to sediment mesocosms. The isotopes were traced into …
Tidal Amplification Of Seabed Light, D. G. Bowers, John M. Brubaker
Tidal Amplification Of Seabed Light, D. G. Bowers, John M. Brubaker
VIMS Articles
Because solar irradiance decreases approximately exponentially with depth in the sea, the increase in irradiance at the seabed from mid to low tide is greater than the decrease from mid to high tide. Summed over a day, this can lead to a net amplification of seabed irradiance in tidal waters compared to nontidal waters with the same mean depth and transparency. In this paper, this effect is quantified by numerical and analytical integration of the Lambert-Beer equation to derive the ratio of daily total seabed irradiance with and without a tide. Greatest amplification occurs in turbid water with large tidal …
Effluent Organic Nitrogen (Eon): Bioavailability And Photochemical And Salinity-Mediated Release, Da Bronk, Qn Roberts, Mp Sanderson, Ea Canuel, Pg Hatcher, Et Al.
Effluent Organic Nitrogen (Eon): Bioavailability And Photochemical And Salinity-Mediated Release, Da Bronk, Qn Roberts, Mp Sanderson, Ea Canuel, Pg Hatcher, Et Al.
VIMS Articles
The goal of this study was to investigate three potential ways that the soluble organic nitrogen (N) fraction of wastewater treatment plant (WWTP) effluents, termed effluent organic N (EON), could contribute to coastal eutrophication - direct biological removal, photochemical release of labile compounds, and salinity-mediated release of ammonium (NH4+). Effluents from two WWTPs were used in the experiments. For the bioassays, EON was added to water from four salinities (similar to 0 to 30) collected from the James River (VA) in August 2008, and then concentrations of N and phosphorus compounds were measured periodically over 48 h. Bioassay results, based …