Seasonal variations in the utilization of ammonium and nitrate by photoplankton in Vineyard Sound,Massachusetts, USA |
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| Authors: | P M Glibert J C Goldman E J Carpenter |
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| Institution: | (1) Museum of Comparative Zoology, Harvard University, 02138 Cambridge, Massachusetts, USA;(2) Present address: Woods Hole Oceanographic Institution, 02543 Woods Hole, Massachusetts, USA;(3) Marine Science Research Center, State University of New York, 11794 Stony Brook, New York, USA |
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| Abstract: | The nitrogenous nutrition of the phytoplankton in Vineyeard Sound, Massachusetts, USA was investigated over a 15-month period. Highest rates of ammonium uptake were observed immediately prior to, or during, the diatom bloom periods, and with one exception were found in the <10  m size class. The saturating rate of ammonium uptake correlated well with temperature and gave Q10 values of 2.6–3.2; correlations with ambient solar irradiation were not nearly so clear. Uptake rates of ammonium exceeded those of nitrate except during the winter bloom of the diatom Rhizosolenia delicatula; yet calculation of the f ratio revealed that nitrate was relatively important in the nitrogenous nutrition of the phytoplankton throughout the year.Contribution no. 5096 from the Woods Hole Oceanographic Institution |
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