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http://dx.doi.org/10.5657/kfas.2002.35.5.455

Limiting Nutrients for Phytoplankton Growth in the Seomjin River Estuary as Determined by Algal Bioassay Experiment  

Kwon Kee Young (Department of Oceanography, Pukyong National University)
Kim Chang Hoon (Department of Aquaculture, Pukyong National University)
Kang Chang Keun (National Fisheries Research & Development Institute)
Moon Chang Ho (Department of Oceanography, Pukyong National University)
Park Mi Ok (Department of Oceanography, Pukyong National University)
Yang Sung Ryull (Division of Civil and Environmental Engineering, Kwangju University)
Publication Information
Korean Journal of Fisheries and Aquatic Sciences / v.35, no.5, 2002 , pp. 455-461 More about this Journal
Abstract
limiting nutrients for phytoplankton were determined by dissored inorganic nitrogen/phosphorous (DIN/DIP) in situ and algal bioassay experiment in the Seomjin River estuary during a study period from March 1999 to October 2001. DIN/DIP ranged from 14.7 to 681.1 during the study period. DIN/DIP was over 16 at the upper and middle estuarine region where salinity was lower than 25 psu and chlorophyll a concentration was high, probably indicating P-limitation in this region while the ratio was less than 16 at the high saline (> 25 psu) region, reflecting the supply of DIP from Gwangyang Bay and thereby indicating N-limitation at the lower estuarine region. These results suggested that the spatial distribution of DIN/DIP in the study region was controlled by the high supply of phosphate from Gwangyang Bay, the low input from Seomjin River and the active uptake by phytoplankton within the estuarine system. The bioassay experiments using Skeletonema costatum, Thalaasiosira rotula and in situ phytoplankton assemblage displayed relatively higher growth of phytoplankton in the P-added culture media, indicating P-limitation. This result was well consistent with the spatial distribution of inorganic nutrients. S. costatum showed a rapid adaptation to the low salinity compared to other phytoplankton species. This phenomenon seemed to account for the strong (> $90\%$ in total cell number) S. costatum bloom in autumn in this estuary. Moreover, although phytoplankton growth rate was higher in the P-added culture media at the end of culture experiment of in situ phytoplankton, the fast growth in the trace metal-added media at the beginning of the experiment suggested a possibility of limitation by other micro-nutrients such as trace metal and vitamin etc.
Keywords
Limiting nutrient DIN/DIP; Algal bioassay; Seomjin River estuary;
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