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F l u e s of organic carbon and nitrogen, total phosphorus, chlorophyll pigments, carbohydrates, amino acids and amino sugars were determined for a depth-series sediment trap exper~ment in Novernber/December 1983 in the Bransfield Strait, Antarctic Peninsula. Absolute and/or relative increases of phosphorus, glucose and chlorophyll b fluxes and decrease of p-alanine flux with depth suggest a second source of sedimenting organic material besides plankton. This is identified as originating from shallow water macroalgae. Quantification of this contribution shows increases from 37 % at 539 m to 71 % at 1835 m. Cornpanson of corrected planktonic f l u e s with values predicted by the empirical equation of Suess (1980) are in good agreement. Examination of carbohydrate spectra from Bransfield Strait surface sediments shows a macroalgal imprint to be present.

Biogenic fluxes in the Bransfield Strait: planktonic versus macroalgal sources