NDLI: Nitrogen Sources and Rates of Phytoplankton Uptake in Different Regions of Hong Kong Waters in Summer

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Nitrogen Sources and Rates of Phytoplankton Uptake in Different Regions of Hong Kong Waters in Summer

Content Provider	Springer Nature Link
Author	Xu, Jie Glibert, Patricia M. Liu, Hongbin Yin, Kedong Yuan, Xiangcheng Chen, Mianrun Harrison, Paul J.
Copyright Year	2011
Abstract	Phytoplankton uptake rates of ammonium (NH$_{4}$ $^{+}$), nitrate (NO$_{3}$ $^{−}$), and urea were measured at various depths (light levels) in Hong Kong waters during the summer of 2008 using $^{15}$N tracer techniques in order to determine which form of nitrogen (N) supported algal growth. Four regions were sampled, two differentially impacted by Pearl River discharge, one impacted by Hong Kong sewage discharge, and a site beyond these influences. Spatial differences in nutrient concentrations, ratios, and phytoplankton biomass were large. Dissolved nutrient ratios suggested phosphorus (P) limitation throughout the region, largely driven by high N loading from the Pearl River in summer. NH$_{4}$ $^{+}$ and urea made up generally ≥50% of the total N taken up and the f ratio averaged 0.26. Even at the river-impacted site where concentrations of NO$_{3}$ $^{−}$ were >20 μM N, NH$_{4}$ $^{+}$ comprised >60% of the total N uptake. Inhibition experiments demonstrated that NO$_{3}$ $^{−}$ uptake rates were reduced by 40% when NH$_{4}$ $^{+}$ was >5 μM N. The relationship between the total specific uptake rates of N (sum of all measured substrates, V, per hour) and the chlorophyll a-specific rates (micromolars of N per microgram of Chl a per hour) varied spatially with phytoplankton biomass. Highest uptake rates and biomass were observed in southern waters, suggesting that P limitation and other factors (i.e., flushing rate) controlled production inshore and that the unincorporated N (mainly NO$_{3}$ $^{−}$) was transported offshore. These results suggest that, at the beginning of summer, inshore algal blooms are fueled primarily by NH$_{4}$ $^{+}$ and urea, rather than NO$_{3}$ $^{−}$, from the Pearl River discharge. When NH$_{4}$ $^{+}$ and urea are depleted, then NO$_{3}$ $^{−}$ is taken up and can increase the magnitude of the bloom.
Starting Page	559
Ending Page	571
Page Count	13
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	35
Issue Number	2
e-ISSN	15592731
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-11-09
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nitrate Ammonium Urea N uptake Pearl River discharge Sewage effluent Ecology Coastal Sciences Nature Conservation Environment Environmental Management Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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