| Title |
Effect of Climate Change for Diatom Bloom at Winter and Spring Season in Mulgeum Station of the Nakdong River, South Korea |
| Authors |
정승현 ( Seung Hyun Joung ) ; 박혜경 ( Hae Kyung Park ) ; 이혜진 ( Hae Jin Lee ) ; 이수형 ( Soo Hyung Lee ) |
| Keywords |
Ch1; a; Climate change; Nakdong River; Optimal growth temperature; Stephanodiscus |
| 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 phyto plankton biomass. Among this period, phytoplankton biomass was high related with water temperature r2=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 ch1.a variation, because temperature was strongly related with water temperature r2=0.748, p<0.01. From 1997 to 2010, the annual maximum phytoplankton biomass was recorded in the rang of temperature from 4.8 to 8.4, 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 correspondded to the trend of ch1.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. |