Phytoplankton Size and Taxonomic Composition in a Temperate Estuary Influenced by Monsoon |
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| Authors: | Yongsik Sin Bonggil Hyun Quang-Dung Bach Sungryull Yang Chul Park |
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| Institution: | (1) Division of Ocean System Engineering, Mokpo National Maritime University, Mokpo, 530-729, South Korea;(2) Department of Environmental Engineering, Kwangju University, Kwangju, 502-703, South Korea;(3) Department of Oceanography, Chungnam National University, Daejeon, 305-764, South Korea;(4) Present address: Korea Ocean Research and Development Institute/South Sea Institute, Jangmok, 656-830, South Korea |
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| Abstract: | Temporal and spatial variations in phytoplankton in Asan Bay, a temperate estuary under the influence of monsoon, were investigated
over an annual cycle (2004). Phytoplankton blooms started in February (>20 μg chl l−1) and continued until April (>13 μg chl l−1) during the dry season, especially in upstream regions. The percentage contribution of large phytoplankton (micro-sized)
was high (78–95%) during the blooms, and diatoms such as Skeletonema costatum and Thalassiosira spp. were dominant. The precipitation and freshwater discharge from embankments peaked and supplied nutrients into the bay
during the monsoon event, especially in July. Species that favor freshwater, such as Oscillatoria spp. (cyanobacteria), dominated during the monsoon period. The phytoplankton biomass was minimal in this season despite nutrient
concentrations that were relatively sufficient (enriched), and this pattern differed from that in tropical estuaries affected
by monsoon and in temperate estuaries where phytoplankton respond to nutrient inputs during wet seasons. The flushing time
estimated from the salinity was shorter than the doubling time in Asan Bay, which suggests that exports of phytoplankton maximized
by high discharge directly from embankments differentiate this bay from other estuaries in temperate and tropical regions.
This implies that the change in physical properties, especially in the freshwater discharge rates, has mainly been a regulator
of phytoplankton dynamics since the construction of embankments in Asan Bay. |
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