MARINE ENVIRONMENT AND ALGAL BLOOMS IN GAMAK BAY
The primary objective of this study was to gain insight into the characteristics of algal blooms in relation to the marine environment of Gamak Bay, using 22 years worth of data since the first known occurrence of algal blooms in 1984. The sea surface temperature of Gamak Bay is closely associated with air temperatures in Yeosu, but it lags a month behind with regard to air temperature. Salinity also varies considerably with the seasons, and is influenced by runoff from the land in the summer, or from freshwater coming from the Sumjin River out of the bay. DO concentration appears to vary in rough inverse proportion to water temperature and, in addition, decreases with the slight increases in COD concentration observed during the time of stratification. The ratio of N/P is approximately 5.28 for the entire bay, but is closer to 3.0 around the oyster farms, which suggests the removal of N by oysters in the farms. 23 different species appear to be causative organisms in the Gamak Bay, and Prorocentrum sp. and Cochlodinium polykrikoides appear to be the most relevant organisms in this regard. Algal blooms in Gamak Bay tend to occur when the precipitation or water temperature for a ten-day period prior to the annual bloom exceeds the long-term mean value. There are five notable causative species in the Gamak Bay, namely Prorocentrum sp., Cochlodinium polykrikoides, Chaetoceros sp., Skeletonema costatum, and Heterosigma akashiwo. With regard to their individual appearance conditions, Skeletonema costatum is eurythermal and euryhaline, Chaetoceros sp. is stenothermal and euryhaline, and Heterosigma akashiwo, Prorocentrum sp. and Cochlodinium polykrikoides are all stenothermal and stenohaline. A species succession phenomenon has been observed during blooms in Gamak Bay, i.e., from Skeletonema costatum or Heterosigma akashiwo to Prorocentrum sp., and from Prorocentrum sp. to Chaetoceros sp. or Cochlodinium polykrikoides. This species succession pattern appears to be associated with the development of stratification.
Moonock Lee Byeongkuk Kim Yeongah Kwon
Faculty of Marine Technology, Chonnam National University, San 96-1 Doondeok-dong,Yeosu 550-749, Kor College of Fisheries and Ocean Sciences, Chonnam national University, San 96-1 Doondeok-dong, Yeosu
国际会议
第四届亚太地区海岸会议(the Fourth International Conference on Asian and Pacific Coasts)
南京
英文
2007-09-21（万方平台首次上网日期，不代表论文的发表时间）