Abstract
Winter blooms of Stephanodiscus spp. (>85% of total community; mean chlorophyll value of 63.2±67.2 μg l−1) were repeatedly observed in the lower Nakdong River (1994–2001). Diatoms were abundant all year round, except summer (June to September). Four major genera (Aulacoseira, Cyclotella, Stephanodiscus and Fragilaria) accounted for over 70% of the numeric abundance of total phytoplankton. A significant increase in the biomass of this Stephanodiscus occurred in late November, peaking in January to February. Low water temperature, increase of the reservoir's retention time, and low grazing by zooplankton may have allowed development of this diatom species. This diatom declined with the decrease of SiO2,increase of water temperature and high zooplankton density from mid-April. Biological controls act only when physical constraints are alleviated for phytoplankton – here Stephanodiscus blooms.
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Ha, K., Jang, MH. & Joo, GJ. Winter Stephanodiscus bloom development in the Nakdong River regulated by an estuary dam and tributaries. Hydrobiologia 506, 221–227 (2003). https://doi.org/10.1023/B:HYDR.0000008564.64010.4c
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DOI: https://doi.org/10.1023/B:HYDR.0000008564.64010.4c