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Loss and recycling of amino acids and protein from smooth cordgrass (Spartina alterniflora) litter

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Abstract

We investigated the source and composition of free and protein-bound amino acids during the decomposition ofSpartina alterniflora Loisel in laboratory percolators and in a field experiment in the Great Sippewissett Marsh (Falmouth, Massachusetts). In the percolator experiment, 50% of the nitrogen (N) could be extracted fromS. alterniflora litter in 16 d. This extract consisted of dissolved free amino acid N (28%), suspended protein amino acid N (16%), inorganic N (12%), and nitrogen from unidentified compounds (44%). Much of the free amino acid nitrogen was utilized by detrital microorganisms, resulting in a greater loss of suspended protein amino acid (SPAA) nitrogen from the biologically active percolator due to microbials biomass. Suspended microbial mass accounted for at least 50% of the SPAA washed out of the biologically active percolator. In the field study, 38% of the original litter nitrogen was leached fromS. alterniflora litter in litterbags during the first 13 d. After this initial leaching period, the concentration (41% to 69% of total nitrogen) and composition of most amino acids bound in the litter did not change over the 23-month period of the experiment. Increases in microbial protein did not account for increases in total nitrogen which occurred during the decomposition of the litter. Similarly, adsorbed ammonium did not appear to be responsible for this increase.

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Authors and Affiliations

  1. Department of Biology, University of Minnesota, 55812, Duluth, Minnesota

    Randall E. Hicks

  2. Marine Sciences Research Center, State University of New York, 11794, Stony Brook, New York

    Cindy Lee

  3. New Jersey Department of Environmental Protection, 401 East State Street, 08625, Trenton, New Jersey

    Andrew C. Marinucci

Authors
  1. Randall E. Hicks
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  2. Cindy Lee
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  3. Andrew C. Marinucci
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Hicks, R.E., Lee, C. & Marinucci, A.C. Loss and recycling of amino acids and protein from smooth cordgrass (Spartina alterniflora) litter. Estuaries 14, 430–439 (1991). https://doi.org/10.2307/1352267

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  • DOI: https://doi.org/10.2307/1352267

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