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Temporal Fluctuation and Ecological Characteristics of Noctiluca scintillans (Dinophyceae) in the Coastal Waters of Incheon, Korea  

Yoo, Jeong-Kyu (Environmental Engineering and Consultant Technology Institute)
Youn, Seok-Hyun (East Fisheries Research Institute, NFRDI)
Choi, Joong-Ki (Department of Oceanography, Inha University)
Publication Information
Korean Journal of Environmental Biology / v.24, no.4, 2006 , pp. 372-379 More about this Journal
Abstract
In order to study temporal fluctuation and ecological characteristics of Noctiluca scintillans, its abundance was investigated in correlation with water temperature, salinity, precipitation, chlorophyll a concentration and copepods abundance in the coastal waters of Incheon from January 1999 to December 2000. N. scintillans was seasonally abundant during spring and autumn with temperature ranging from 10.3 to $21.5^{\circ}C$, but depleted in winter and summer. Low temperature below $4.5^{\circ}C$ in winter and low salinity due to high rainfall in summer led N. scintillans to disappear. A Cross Correlation Analysis (CCA) showed that chlorophyll a concentration was positively correlated with abundance of N. scintillans at the time lags of 10 days. This suggests that phytoplankton may be a contributing factor for increasing abundance of N. scintillans. During spring, eggs of Acartia hongi were found in 2.9 to 21.1% of individuals of N. scintillans. It was deduced that 1.2 to 49.5% of the eggs produced by A. hongi was preyed upon by N. scintillans. Therefore, N. scintillans may control the population size of initial developmental stage of A. hongi in the costal waters of Incheon.
Keywords
Noctiluca scintillans; temperature; rainfall; chlorophyll a; Acartia hongi eggs;
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