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KMID : 0364820130490010030
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Korean Journal of Microbiology
2013 Volume.49 No. 1 p.30 ~ p.37
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Winter Algal Bloom and Spatial Characteristics of Water Quality in the Lower Taewha River, Ulsan, Korea
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Sohn Eun-Rak
Park Jung-Im
Lee Bo-Ra
Lee Jin-Woo
Kim Jong-Seol
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Abstract
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This study was carried out to assess the spatial and tidal effects on the water quality in the lower reaches of Taewha
River, Ulsan, Korea and to understand the environmental factors affecting winter algal bloom in the river. From May,
2010 to January, 2011, water samples were collected at five locations (New Samho Bridge, Old Samho Bridge,
Mungjung Stream, Taewha Bridge, and Mungchon Bridge) along the river at high and low tides of spring tide. We
measured environmental parameters including salinity, dissolved oxygen (DO), biological oxygen demand (BOD),
chemical oxygen demand (COD), chlorophyll a (Chl a) and various nutrient concentrations. Salinity increased
towards the downstream direction. Average values of Chl a concentrations ranged 10?26 mg/m3
at high tide and 11?53 mg/m3 at low tide depending on sampling locations. It was noteworthy that there were strong increases in Chl a concentrations during the November 21 to December 22 sampling period especially at the Taewha Bridge. At the location, Chl a concentrations were measured as 138?296 mg/m3 for the period; Rhodomonas lacustris of class Cryptophyceae was the dominant algal species. Chl a concentrations at the Taewha Bridge were positively correlated with such parameters as salinity, BOD, DO, COD, pH, and T-N, and negatively correlated with temperature and
NO3--N. On the other hand, at the Mungchon Bridge the highest concentration of Chl a was 55 mg/m3 on August 25,
and Chl a concentrations were positively correlated with NH3-N, T-N, PO4
3--P, T-P, and heterotrophic plate counts.
The results suggested that water quality in the lower Taewha River fluctuated a lot with the sampling locations and
the patterns of algal blooms were different between Taewha Bridge and Mungchon Bridge sampling locations.
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KEYWORD
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algal bloom, Taewha River, water quality, winter
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