福建平潭海域米氏凯伦藻(Karenia mikimotoi)增殖影响因子研究

Study on the Factors Affecting the Proliferation of Karenia mikimotoi in Pingtan Coastal Area of Fujian Province

分析了2018年5-6月平潭海域的气象及水文情况,探讨了环境因子对米氏凯伦藻(Karenia mikimotoi)增殖的影响.Spearman相关性分析显示,米氏凯伦藻细胞密度与气温、水温、叶绿素a呈极显著正相关,与盐度、压强呈极显著负相关.平潭海域米氏凯伦藻增殖的适宜盐度为28.4~30.0,水温为23.5~25.0℃,压强为99.7~101.0 kPa,叶绿素a为1.5~7.2μg·L^-1,其最高密度8.5×10^5 cells发生在海水盐度为28.9,水温为24.6℃,压强为99.9 kPa.平潭海域浮游植物4-5月以中肋骨条藻为优势种,5-6月演替为米氏凯伦藻为优势种,温度、盐度和气压是影响其增殖的重要环境因子.

This paper analyzed the meteorological and hydrological factors affecting the proliferation of Karenia mikimotoi in Pingtan coastal area of Fujian from May to June in 2018.Spearman analysis suggested that the cell density of Karenia mikimotoi was positively correlated with air temperature,water temperature and chlorophyll a concentration and negatively correlated with salinity and pressure.The salinity of 28.4~30.0,water temperature of 23.5~25.0℃,pressure of 99.7~101.0 kPa and chlorophyll a of 1.5~7.2μg·L^-1 could sustain the well proliferation of Karenia mikimotoi.The salinity of 28.9,water temperature of 24.6℃and pressure of 99.9 kPa were obtained the highest density of Karenia mikimotoi,which was 8.5×10^5 cells.Our data also showed that Skeletoneema costatum predominated in Pingtan coastal area from April to May,but Karenia mikimotoi predominated from the late May to June.The results showed that the water temperature,salinity and air pressure were important environmental factors affecting the proliferation of Karenia mikimotoi.