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Effect of Climate Change for Diatom Bloom at Winter and Spring Season in Mulgeum Station of the Nakdong River, South Korea  

Joung, Seung-Hyun (Water Environment Research Department, National Institute of Environment Research)
Park, Hae-Kyung (Water Environment Research Department, National Institute of Environment Research)
Lee, Hae-Jin (Nakdong River Environment Research Center)
Lee, Soo-Hyung (Water Environment Research Department, National Institute of Environment Research)
Publication Information
Journal of Korean Society on Water Environment / v.29, no.2, 2013 , pp. 155-164 More about this Journal
Abstract
To confirm the relationship between climate change and Stephanodiscus in Mulgeum station of Nakdong River, Korea, this study was conducted. The temperature in crease by climate change was observed in the study site, where the temperature was gradually increased in most seasons, except for summer season. The mass proliferation of Stephanodiscus constantly appeared in every year, especially between November and March, and when Stephanodiscus abundance was above 90% in phytoplankton biomass. Among this period, phytoplankton biomass was high related with water temperature ($r^2$=0.249, P<0.01) than nutrient factors such as nitrogen and phosphorus in the study site. Finally, temperature by climate change can be regarded as the affecting factor for chl. a variation, because temperature was strongly related with water temperature ($r^2$=0.748, P<0.01). From 1997 to 2010, the annual maximum phytoplankton biomass was recorded in the range of temperature from $4.8^{\circ}C$ to $8.4^{\circ}C$, and the range was regarded as the temperature condition for the optimal growth of Stephanodiscus in the study site. On the optimal growth temperature, the trend of monthly average temperature corresponded to the trend of chl. a variation from November to March. In future, the increase of temperature by climate change can prolong Stephanodiscus blooming period in winter and spring seasons.
Keywords
Chl. a; Climate change; Nakdong River; Optimal growth temperature; Stephanodiscus;
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