Nitrogen recycling in coastal waters of southeastern U.S. during summer 1986

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ID: 302731
1990
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Abstract
Summer-time pelagic nitrogen recycling using an {sup 15}NH{sub 4}{sup +} tracer technique was studied for important biological pathways, sinks, and residence times in the microbial food web of coastal Georgia, U.S.A. Results showed that estimated rates of NH{sub 4}{sup +} regeneration by a variety of microheterotrophs and microzooplankton balanced rates of NH{sub 4}{sup +} assimilation by the microbial community. In bottom water below the 1% light level, NH{sub 4}{sup +} regeneration exceeded community NH{sub 4}{sup +} assimilation by 3.5 times. However, over a period of 2 weeks, high NH{sub 4}{sup +} concentrations rarely occurred in bottom waters, and this was attributed to rapid mixing of the water column by winds and tides. Estimated mixing time from time-dependent numerical models were on the order of NH{sub 4}{sup +} turnover times of 5 to 10 hours. Overall, rates of community NH{sub 4}{sup +} assimilation exceeded rate estimates of phytoplankton N demand by 1.8 to 2.7 fold, which were made from rates of {sup 14}CO{sub 2} incorporation into proteins. In bottom samples where phytoplankton were light limited, rates of NH{sub 4}{sup +} assimilation exceeded the phytoplankton N demand by 3.6 to 11.1 fold. Calculations concerning the role of dissolved organic nitrogen in Nmore » cycling suggest that only 10% is recycled to NH{sub 4}{sup +} daily. This N could support 12 to 29% of the estimated phytoplankton N demand. Residence times of particulate nitrogen pools, based on rates of NH{sub 4}{sup +} regeneration, were on the order of 3-10 days. During summer-time hydrographic conditions and despite other losses, particulate nitrogen could recycle as often as 100 times before autumn removal processes occur off southeastern US.« less
Reference Key
openalex_W1987053780 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Roger B. Hanson, C. Robertson, James A. Yoder, PG Verity, S. Stephen Bishop
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Journal journal of marine research
Year 1990
DOI
10.1357/002224090784984704
URL
https://doi.org/10.1357/002224090784984704
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