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http://dx.doi.org/10.11626/KJEB.2013.31.4.308

Hydrographical and Bio-ecological Characteristics of Heterotrophic Red Tide Dinoflagellate Noctiluca scintillans in Semi-enclosed Gwangyang Bay, Korea  

Baek, Seung Ho (South Sea Institute, KIOST)
Kim, Dongseon (Ocean Data and Information Unit, KIOST)
Choi, Hyun-Woo (Ocean Circulation & Climate Research Department, KIOST)
Kim, Young Ok (South Sea Institute, KIOST)
Publication Information
Korean Journal of Environmental Biology / v.31, no.4, 2013 , pp. 308-321 More about this Journal
Abstract
In order to understand the population dynamics of red tide dinoflagellate Noctiluca scintillans, we examined its hydrographical and bio-ecological characteristics at 19 to 20 stations of Gwangyang Bay during all four seasons from 2010 to 2012. During the 3-year period, N. scintillans was seasonally abundant during summer with water temperatures ranging from $15^{\circ}C$ to $22^{\circ}C$ and salinity ranging from 25 psu to 30 psu. On the other hand, N. scintillans population density significantly decreased in spring, fall and winter, although they were present even in lower temperatures (< $4^{\circ}C$). However, high water temperature (> $27^{\circ}C$) and low salinity (< 12 psu) led to the disappearance of N. scintillans population. Chl-a concentration in winter, spring and fall was positively correlated with N. scintillans population density, whereas the N. scintillans population was negatively correlated with Chl-a concentration in summer. This implies that densities of prey population such as diatoms are one of important contributing factor for maintaining abundance of N. scintillans in winter, spring and fall and for increasing abundance of N. scintillans in summer. During summer season, bio-accumulation of N. scintillans population by the wind from southwest is also considered to be a key factor in triggering the formation of large-scale blooms in Gwangyang Bay.
Keywords
temperature; salinity; wind speed and direction; chlorophyll a; N. scintillans; Gwangyang Bay;
Citations & Related Records
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