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http://dx.doi.org/10.5762/KAIS.2016.17.11.186

Growth and community response of phytoplankton by N, P and Fe nutrient addition in around water of Ulleungdo and Dokdo in East Sea  

Baek, Seung Ho (South Sea Environment research Division, Korea Institute of Ocean Science & Technology)
Lee, Minji (South Sea Environment research Division, Korea Institute of Ocean Science & Technology)
Kim, Yun-Bae (Ulleungdo.Dokdo Ocean Science Station, Korea Institute of Ocean Science & Technology)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.17, no.11, 2016 , pp. 186-195 More about this Journal
Abstract
We investigated phytoplankton and vertical inorganic nutrients at two stations around water of Ulleungdo and Dokdo in the East Sea, Korea. Nutrient addition experiments (+N, +P, +NP and +Fe) were also conducted to determine the growth response and nutrient consumption of the phytoplankton assemblage using the surface water of St. UD3 and St.50. In the field, although inorganic nutrients were low in the euphotic layer, these nutrients were increased at depths below 100 m. The total phytoplankton abundances in St. UD3 and St.50 were $4.9{\times}10^5cells\;L^{-1}$ and $1.9{\times}10^5cells\;L^{-1}$, respectively. The dominant species at St. UD3 was observed to be Raphidophyta Heterosigma akashiwo, Cryptophyta Crytomonas spp., and diatom Leptocylindrus danicus, while L. danicus and H. akashiwo including small diatom species Chaetoceros socialis were dominant at St. 50. In the nutrient addition experiments, phytoplankton growth (in vivo flourescence) in the +N and +NP treatment was 2-3 times higher than that in the +P treatment, indicating that the natural phytoplankton can respond to pulsed nutrient loading events. In addition, in vivo fluorescence in +Fe treatment was not statistically (p>0.05) different from that of the non-Fe treatments, indicating that the phytoplankton growth response in +Fe treatment was not significant. Dominant H akashiwo and L. danicus in the field showed a rapid response in nutrient additional bio-algal assay, particularly L. danicus in the +Fe treatments.
Keywords
Bioassay; Dokdo; Growth response; Nutrients; Phytoplankton; Ulleungdo;
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