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http://dx.doi.org/10.4217/OPR.2018.40.4.191

Phytoplankton Community and Surrounding Water Conditions in the Youngsan River Estuary: Weekly Variation in the Saltwater Zone  

Sin, Yongsik (Department Ocean System Engineering, Mokpo National Maritime University)
Yu, Haengsun (Department Ocean System Engineering, Mokpo National Maritime University)
Publication Information
Ocean and Polar Research / v.40, no.4, 2018 , pp. 191-202 More about this Journal
Abstract
In this study we conducted a weekly monitoring exercise at a fixed station in the saltwater zone during the dry season (Jan-Mar, 2013) and wet season (Jun-Aug, 2013) to understand the fluctuations in phytoplankton communities and environmental factors in the Youngsan River estuary altered by a dike constructed in the coastal area. Phytoplankton communities displayed seasonality; diatoms were dominant during the dry season whereas dinoflagellates were dominant during the wet season. T-test analysis showed that water temperature was significantly different between the seasons whereas freshwater discharge from the dike was not significantly different. This suggests that seasonal variations of phytoplankton are more likely affected by water temperature than freshwater discharge. However, a short-term fluctuation was also observed in response to freshwater discharge; freshwater species appeared during or after the discharge in the dry and wet seasons and blooms of harmful species developed after the discharge. Phytoplankton communities may be affected by changes in physical factors such as turbidity and salinity and nutrient supply resulting from freshwater discharge. Especially, the nutrient supply may directly contribute to the harmful algal blooms (HABs) composed of dinoflagellates which can adapt to low salinity after freshwater discharge.
Keywords
Youngsan River estuary; weekly monitoring; phytoplankton community; HABs;
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