# 동해 연안 수괴 특성에 따른 식물플랑크톤 우점종의 계절 변동

Shim, Jeong-Min;Kwon, Ki-Young;Kim, Sang-Woo;Yoon, Byong-Seon
심정민;권기영;김상우;윤병선

• Accepted : 2015.10.27
• Published : 2015.10.31
• 10 75

#### Abstract

In order to understand the seasonal change of phytoplankton as well as the effect of water physico-chemical parameters, we investigated 18 stations in coastal areas of the East Sea in February, May, August and November in 2009. The taxa of phytoplankton observed in this study were classified as 37 Bacillariophyceae, 22 Dinophyceae, 1 Euglenophyceae, 3 Dictyophyceae and 1 Cryptophyceae. Phytoplankton abundance ranged from $1.2{\times}10^3cells/L$ to $246.6{\times}10^3cells/L$(with a mean value of $24.8{\times}10^3cells/L$), the highest biomass was observed in May. The dominant species were Leptocylindrus danicus, Chaetoceros affinis, Pseudo-nitzschia pungens, Thalassionema nitzschioides and etc. Pearson's correlation co-efficient between phytoplankton abundance and other water parameters showed the positive relationships with pH, DO, Secchi-disk depth, and SS, the negative relationships with $SiO_2-Si$. Seasonal patterns of phytoplankton dominant species were affected by the characteristics of water masses based on T-S diagram analysis. In particular, phytoplankton distributional patterns were related with water temperature in May and salinity in August, respectively. According to the result of MDS(Multi-dimensional scaling) using the phytoplankton abundance and species composition, the spatial distribution of phytoplankton were characterized with Ganwon(Group A) and Gyeongbuk(Group B) at the coastal areas of Jukbyeon or Uljin.

#### Keywords

Phytoplankton dominant species;Species composition;Abundance;Correlation co-efficient;Water mass

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#### Acknowledgement

Grant : 적조 모니터링 및 발생 메커니즘 연구

Supported by : 국립수산과학원