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- W167382819 abstract ": Previously, other researchers have observed rapid biogeochemical changes at the freshwater-seawater interface (FSI) of the Tamar Estuary in England. The postulated cause of these changes is a sequence of processes triggered by mass mortality of freshwater phytoplankton. Such mortality can be viewed as an example of selective “filtration” operating at the FSI. We examined a number of physical, chemical, and microbiological variables in the Neuse River Estuary, North Carolina, within the context of this hypothesis. Nitrate nitrogen, orthophosphate, and number of phytoplankton taxa all decreased significantly (p<0.05) going downriver across the FSI, while bacterial density and productivity each rose sharply (p<0.05). Other parameters that were monitored (phytoplankton density, chlorophyll a, ammonia nitrogen, and light absorption coefficient), changed in the vicinity of the FSI, but none of the changes were statistically significant at the 0.05 level. In the laboratory, we tested the effects of low salinities on the riverine microbial community. Of seven variables, only bacterial density and bacterial productivity showed any significant treatment effects. Overall, we could not confirm the hypothesis that exposure to salt in the FSI affects the microbial community. Alternate hypotheses involving nutrient availability, increased residence time of water, light availability, and population interactions are discussed." @default.
- W167382819 created "2016-06-24" @default.
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- W167382819 date "1984-01-01" @default.
- W167382819 modified "2023-09-26" @default.
- W167382819 title "MICROBIOLOGICAL CHANGES OCCURRING AT THE FRESHWATER-SEAWATER INTERFACE OF THE NEUSE RIVER ESTUARY, NORTH CAROLINA" @default.
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- W167382819 doi "https://doi.org/10.1016/b978-0-12-405070-9.50022-0" @default.
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