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Temporal variability of amino acid, hexosamine, and carbohydrate fluxes on the eastern Brazilian continental margin related to discharge of the São Francisco River, Brazil

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Abstract

Settling particles collected at 1550 m water depth off the São Francisco River, Brazil, between January and May 1995 showed peak fluxes of amino acids, hexosamines, and carbohydrates, which formed the onset of a three-week period of high organic matter (OM) flux, coinciding with the high discharge period of the river. Two phases of OM deposition exist: (1) the fluvial input of nutrients triggering a bloom of non biomineralizing plankton, and (2) suspended sediment mainly derived from shelf erosion increasing the fluxes of refractory OM. This indicates the importance of seasonally varying hydrodynamic conditions and nutrient input from the continent for the production and sedimentation of OM to the continental margin of eastern Brazil.

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Authors and Affiliations

  1. Institute of Biogeochemistry and Marine Chemistry, University of Hamburg, Bundesstrasse 55, D-20146 Hamburg, Germany, , , , , , DE

    T. C. Jennerjahn & V. Ittekkot

  2. Laboratory of Environmental Sciences, State University of North Fluminense, Av. Alberto Lamego 2000, 28015-620 Campos, Brazil, , , , , , BR

    C. E. V. Carvalho, A. R. C. Ovalle & C. E. Rezende

  3. Leibniz Laboratory, University of Kiel, Max-Eyth-Strasse 11-13, D-24118 Kiel, Germany, , , , , , DE

    H. Erlenkeuser

Authors
  1. T. C. Jennerjahn
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  2. V. Ittekkot
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  3. C. E. V. Carvalho
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  4. A. R. C. Ovalle
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  5. C. E. Rezende
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  6. H. Erlenkeuser
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Jennerjahn, T., Ittekkot, V., Carvalho, C. et al. Temporal variability of amino acid, hexosamine, and carbohydrate fluxes on the eastern Brazilian continental margin related to discharge of the São Francisco River, Brazil. Geo-Marine Letters 19, 202–208 (1999). https://doi.org/10.1007/s003670050110

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  • DOI: https://doi.org/10.1007/s003670050110

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