| Title |
On the Spatio-temporal Distributions of Water Quality and Chlorophyll a, and the Environmental Factors on the Variation of the Phytoplankton Biomass in the Mokpo Coastal Waters , Southwestern Korea during Low Temperature Season |
| Abstract |
Field survey on the distributional characteristics of water quality and environmental factors on the variation of the phytoplankton biomass in Mokpo coastal waters, southwestern Korea were carried out at the 30 stations in November 1991 and in February 1992. I made an analysis on biological factor as chlorophyll a concentration as well as water quality such as dissolved oxygen(DO). chemical oxygen demand(COD), suspended solid(SS) and nutrients: ammonia. nitrite, nitrate, dissolved inorganic nitrogen, phosphate. N/P ratio, silicate and Si/P ratio. In the Mokpo coastal waters, the high productivity in photic layer were supported by high nutrients concentration from the runoff of freshwater and the input of outside seawater in low temperature season. The high concentrations of suspended solid in straits had a bad influence upon marine primary production. Mokpo coastal waters had a sufficient nutrients for primary production during a year. Especially the dissolved inorganic nitrogen were high, the other side. silicate and phosphate was very low. The source of nitrogen supply depended on runoff of freshwater including urban waste water. On the other hand, silicate and phosphate were input of outside seawater. Phosphate and silicate seemed to become a limiting factor for primary production in low temperature season. Phytoplankton biomass as measured by chlorophyll a concentration was very high in low temperature season, and it was controlled by the combination of several environmental factors, especially of phosphate, Si/P ratio and physical factor such as intensity of illumination. |