Formation of transparent exopolymeric particles (TEP) from macroalgal detritus
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Detritus derived from macroalgae often accumulates in the littoral and sublittoral of temperate shores. Experiments were conducted to test the hypothesis that macroalgal detritus is a source of transparent exopolymer particles (TEP). Macroalgal detritus was incubated in artificial seawater media under various experimental conditions. TEP concentrations were found to be proportional to the concentration of macroalgal detritus; however, dissolved carbohydrate concentrations were not related to detritus concentration. As TEP concentration did not increase over time, it was probably washed off the detritus when it was initially placed in the media. However, higher concentrations of TEP (262 μg Gum Xanthan equivalent [g detritus] -1) were produced if inorganic nutrients were added to the media compared to controls (75 μg Gum Xanthan equivalent [g detritus] -1). Dissolved carbohydrate and TEP concentrations increased with incubation temperature. TEP did not form abiotically from carbohydrate precursors derived from macroalgal detritus, indicating that microbial activity was important in their formation. TEP from macroalgal detritus will result in a flux of small, sticky particles into the water column which may subsequently affect the aggregation of both biotic and abiotic particles. This will affect both biogeochemical nutrient cycling in coastal waters and food web dynamics.
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