. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SA Figure 1. In) Salinity profile!, typical for the Parker River Exilian- site over a year. Open symbol reflects the profile of the initial untreated core analyzed during this stnd\. Ib) Average salinity profiles for salt-water treatments during the experiment, (c) Accumulation or loss of free anil exchangeable uimnoniiiin in sediments during the 35-day incubation, till Accumulation of dissolved inorganic nitrogen in the overlying water during the 35-day incubation, let Accumulation or loss of total inorganu nitrogen in sedi
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. SA Figure 1. In) Salinity profile!, typical for the Parker River Exilian- site over a year. Open symbol reflects the profile of the initial untreated core analyzed during this stnd\. Ib) Average salinity profiles for salt-water treatments during the experiment, (c) Accumulation or loss of free anil exchangeable uimnoniiiin in sediments during the 35-day incubation, till Accumulation of dissolved inorganic nitrogen in the overlying water during the 35-day incubation, let Accumulation or loss of total inorganu nitrogen in sediments and overlying water during the 35-day incubation. Abbreviations: FO = fresh oxic, FA = fresh anoxic, SO = salt o.\ic. and = salt anoxic. For all cores, the overlying water was changed every 3 to 7 days and sampled for ammonium and nitrate/nitrite. At intervals throughout the 35-day study, one core from each treatment was sectioned into 2-cm intervals (three untreated cores were ana- lyzed on day 0 for baseline analysis). Free and exchangeable ammonium concentrations and chloride concentrations were an- alyzed in each sediment section. The concentrations of free ammonium, exchangeable ammonium, and dissolved inorganic nitrogen fluxes (ammonium and nitrate/nitrite) to the overlying water were individually summed at each sampling time, and then subtracted from their initial baseline concentrations. These results represented the total change in free and exchangeable ammonium in the sediments and the total amount of dissolved inorganic nitrogen (DIN) fluxed to the overlying water over the course of the study. Throughout the experiment, the fresh-water chloride profiles remained similar to the initial profile, or Day 0 (Fig. Ib). The chloride profiles of the salt-water treatments indicated salt intru- sion with depth over time (Fig. Ib). By the end of the investiga- tion, there was a greater accumulation of free ammonium in the salt-water treatments than in the fresh-water
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
