诏安湾及其邻近海域浮游植物群落结构与环境因子的关系

Community structure of phytoplankton in Zhao’an Bay and its adjacent waters and environmental factors

根据2015年夏、秋两季在诏安湾及其邻近海域开展大面综合调查获得的数据,研究了该海域浮游植物的群落结构,并对浮游植物群落与环境因子的关系进行了冗余分析。共鉴定浮游植物2门33属80种,其中硅藻门28属71种,甲藻门5属9种。夏季优势种为菱形海线藻(Thalassionema nitzschioides)、尖刺菱形藻(Nitzschia pungens)和中肋骨条藻(Skeletonema costatum),秋季优势种为钟形中鼓藻(Bellerochea horologicalis)、洛氏角毛藻(Chaetoceros lorenzianus)、中肋骨条藻、菱形海线藻、星脐圆筛藻(Coscinodiscus asteromphalus)、琼氏圆筛藻(Coscinodiscus jonesianus)和佛氏海毛藻(Thalassiothrix frauenfeidii)。浮游植物密度在3.32×10^4~1.27×10^8 cells/m^3之间,夏季明显高于秋季,夏、秋两季密度呈现由湾内向湾外逐渐增加的趋势。夏季种类多样性指数平均为1.77,秋季为2.87。冗余分析结果表明,活性磷酸盐、化学需氧量、温度、盐度和pH是影响诏安湾及其邻近海域浮游植物群落的主要环境因子。

Based on the data collected from two surveys in Zhao’an Bay and its adjacent waters in summer and autumn 2015,community structure of phytoplankton was studied and its relationships with environmental factors were performed with redundancy analysis.A total of 80 phytoplankton species were recorded and they belongs to 2 phyla and 33 genera,with 71 species of diatom in 28 genera and 9 species of dinoflagellates in 5 genera.Thalassionema nitzschioides,Nitzschia pungens and Skeletonema costatum were dominant species in summer while Bellerochea horologicalis,Chaetoceros lorenzianus,Skeletonema costatum,Thalassionema nitzschioides,Coscinodiscus asteromphalus,Coscinodiscus jonesianus and Thalassiothrix frauenfeidii dominated in autumn.The phytoplankton densities ranged from 3.32×10^4 cells/m^3 to 1.27×10^8 cells/m^3,and the cell densities in summer were higher than that in autumn.The phytoplankton abundance gradually increased from the inner bay to the outer bay.The average Shannon-Weaver index was 1.77 and 2.87 in summer and autumn,respectively.Redundancy analysis showed that active phosphate,chemical oxygen demand,temperature,salinity and pH were main factors affecting the phytoplankton community.