Marine Biology

, Volume 129, Issue 2, pp 377–387 | Cite as

Organic nitrogen uptake and growth by the chrysophyte Aureococcus anophagefferens during a brown tide event

  • G. M. Berg
  • P. M. Glibert
  • M. W. Lomas
  • M. A. Burford

Abstract

The quantitative importance of light-mediated, dissolved organic nitrogen (DON) utilization in relation to overall nitrogen-assimilation in Aureococcusanophagefferens Hargraves et Sieburth was assessed during a brown tide event in Shinnecock Bay, Long Island, 24 through 26 July 1995. The growth response of A. anophagefferens was maximal in organic-rich Bay water and decreased proportional to the organic:inorganic nutrient ratio of the water. Short-term uptake measurements with six nitrogenous substrates revealed that reduced nitrogen could potentially represent 95% of overall nitrogen uptake of which 70% was due to organic nitrogen alone. Potential uptake of urea by the A. anophagefferens-dominated bloom was substan tially greater than uptake of the other substrates tested during the study, contributing the largest percentage of total nitrogen uptake (58 to 64%; ρmax(urea) 4.4 μg  atom N l−1 h−1), followed by NH4+ (18 to 26%; ρ′max(NH4+) 2 μg atom N l−1 h−1). The combined rates of uptake of algal extract, lysine and glutamic acid contributed between 11 and 16% of total uptake, whereas NO3contributed 5 to 8%. Based on the kinetic determinations from this study we suggest an ecological framework for the events leading to the dominance and abundance of A. anophagefferens in coastal bays.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • G. M. Berg
    • 1
  • P. M. Glibert
    • 1
  • M. W. Lomas
    • 1
  • M. A. Burford
    • 2
  1. 1.Horn Point Environmental Laboratory, University of Maryland, P.O. Box 775, Cambridge, Maryland 21613, USAUS
  2. 2.CSIRO Marine Laboratories, Cleveland, Queensland 4163, AustraliaAU

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