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A Study on the Marine Biological and Chemical Environments in Yeosu Expo Site, Korea  

Noh, Il-Hyeon (Faculty of Marine Technology, Chonnam National University)
Oh, Seok-Jin (Korea Inter-University Institute of Ocean Science, Pukyong University)
Park, Jong-Sick (Faculty of Marine Technology, Chonnam National University)
An, Yeong-Kyu (Faculty of Marine Technology, Chonnam National University)
Yoon, Yang-Ho (Faculty of Marine Technology, Chonnam National University)
Publication Information
Journal of the Korean Society for Marine Environment & Energy / v.13, no.1, 2010 , pp. 1-11 More about this Journal
Abstract
In order to understand the biological environmental characteristics with temporal variations of the physico-chemical factors in 2012 Yeosu Expo site of Korea, we investigated at one station, once per week, from April 2006 to December 2007. The surface water temperature ranged from 6.8 to $27.8^{\circ}C$ and the bottom water temperature ranged from 6.3 to 25.9 $25.9^{\circ}C$. The salinity varied from 12.8 to 33.0 psu in the surface water and from 25.2 to 33.6 psu in the bottom water. A strong halocline was observed between the surface and bottom layers in the summer when a rapid decrease of salinity coincided with heavy rainfall. The DIN concentration ranged from 1.36 to $82.7{\mu}M$ in the surface water and from 0.82 to $25.2{\mu}M$ in the bottom water. Phosphate concentration varied from 0.06 to $2.13{\mu}M$ in the surface water and from 0.07 to $1.38{\mu}M$ in the bottom water. Silicate was $1.68-52.0{\mu}M$ in the surface water and $1.37-30.7{\mu}M$ in the bottom water. The nutrient concentrations were generally high during heavy rainfalls and low water temperature periods, and considerably decreased in spring and autumn. The N/P ratio ranged from 4.43 to 325 in the surface water and from 3.8 to 321 in the bottom water. It increased rapidly during the heavy rainfall season and remained at a value of approximately 16 in other periods. The chlorophyll a concentration ranged from 0.46 to $65.0{\mu}g$ $L^{-1}$ in the surface water and from 0.71 to $15.0{\mu}g$ $L^{-1}$ in the bottom water. $Chl-{\alpha}$ concentration remained low in periods of low water temperature, however rapidly increased in periods of high water temperature. From the results of principal component analysis (PCA) and multiple regression analysis (MRA), we conclude that temporal variations of physico-chemical and biological factors were greatly affected by the influx of fresh water, and that nutrients were well controlled by their uptake and assimilation by phytoplankton. Also, during the low water temperature periods, environmental structure in this study site was affected by recycled nutrients through nutrient cycling and mineralization.
Keywords
2012 Yeosu Expo; $Chlorophyll{\alpha}$; Nutrient; PCA; MRA;
Citations & Related Records
Times Cited By KSCI : 14  (Citation Analysis)
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