이른 봄 나로도 연안해역의 수질환경과 식물플랑크톤 군집의 출현특성

On the distributional characteristics of water quality and phytoplankton community in the coastal waters of Naro islands, southern Korea during early spring

Field survey on the distributional characteristics of water quality and phytoplankton community in the coastal waters of Naro Islands, southern Korea were carried out at the 38 stations in March 27,1993. We made an analysis on biological factor as chlorophyll a and phytoplankton community as well as water quality such as chemical oxygen demand(COD), seston weight(SW) and nutrients; ammonia, nitrite, nitrate, dissolved inorganic nitrogen, phosphate, N/P ratio, silicate and Si/P ratio. In the coastal waters of Naro Islands, the high productivity in photic layer were supported by nutrients from the circulation of meterials in Naro coastal waters. A total of 29 species of phytoplankton blonged to 24 genera was identified. Doninant species were 2 species of centric diatoms, Eucampia zodiacus, Thalassiosira sp. and 2 species of pennate, Asterionellopsis glacialis, Neodelphineis pelagica. The density of phytoplankton cell numbers fluctuated from 31.2 cells/㎖ to 304.0 cells/㎖. The results of principal component analysis(PCA); The source of nutrients supply depend on the mineralization of organic matters, and phytoplankton biomass was controlled by the combination of several environmental factors, especially of nitrogen and water movements. And Naro coastal waters separated with 3 regions by score of PCA. That is to say, Ⅰ regions was western parts of Naro Is. which was characterized by high activity of phytoplankton uptake, Ⅱ regions was the limited western parts of Oenaro Ⅰ. which was done the population of centric diatom, and Ⅲ regions was narrow straits which was done low activity of phytoplankton uptake because high water movement.