Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4545833 | Harmful Algae | 2010 | 9 Pages |
Abstract
Temporal and spatial variability in the kinetic parameters of uptake of nitrate (NO3â), ammonium (NH4+), urea, and glycine was measured during dinoflagellate blooms in Changjiang River estuary and East China Sea coast, 2005. Karenia mikimotoi was the dominant species in the early stage of the blooms and was succeeded by Prorocentrum donghaiense. The uptake of nitrogen (N) was determined using 15N tracer techniques. The results of comparison kinetic parameters with ambient nutrients confirmed that different N forms were preferentially taken up during different stages of the bloom. NO3â (Vmax 0.044 hâ1; Ks 60.8 μM-N) was an important N source before it was depleted. NH4+ (Vmax 0.049 hâ1; Ks 2.15 μM-N) was generally the preferred N. Between the 2 organic N sources, urea was more preferred when K. mikimotoi dominated the bloom (Vmax 0.020 hâ1; Ks 1.35 μM-N) and glycine, considered as a dominant amino acid, was more preferred when P. donghaiense dominated the bloom (Vmax 0.025 hâ1; Ks 1.76 μM-N). The change of N uptake preference by the bloom-forming algae was also related to the variation in ambient N concentrations.
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Aquatic Science
Authors
Ji Li, Patricia M. Glibert, Mingjiang Zhou,