Journal
MARINE POLLUTION BULLETIN
Volume 155, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2020.111200
Keywords
Karenia mikimotoi; Skeletonema costatum sensu lato; Nitrogen; Harmful algal blooms; East China Sea; Urea
Funding
- National Key Research and Development Program of China [2017YFC1404300]
- Natural Science Foundation of China [41176087, 41776121]
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The nitrogen uptake kinetics and physiological growth of Karenia mikimotoi and Skeletonema costatum sensu lato grown on different N substrates and concentrations were compared in the laboratory. In the presence of three N substrates, both species preferred to take up NH4+. K. mikimotoi and S. costatum s.l. showed the highest substrate affinities for urea and NO3-, respectively. Both species grew well on three N substrates, and the growth parameters were comparable among the different N substrates. However, K. mikimotoi assimilated urea more efficiently than it assimilated either NO3- or NH4+. Different with S. costatum s.l., K. mikimotoi grew slowly and steady and the physiological and growth activities in N-depleted conditions were higher than those in N-replete conditions. Our results suggested that K. mikimotoi shows a greater readiness for uptake and assimilation of urea, and that this species is more competitive in an N-depleted environment when compared with S. costatum s.l.
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