阳江港近岸海域浮游植物群落结构初步研究

Community Structure of Phytoplankton in the Coastal Waters of Yangjiang Harbor

于2019年11月(秋季)及2020年3月(春季)在阳江港近岸海域开展了浮游植物群落结构初步研究。结果显示,秋、春两季共鉴定浮游植物4门54属121种,硅藻为主要组成类群。生物密度秋季平均为484.76×10^(5)个/m^(3),春季平均为126.34×10^(5)个/m^(3),均以硅藻为主。秋季优势种为中肋骨条藻Skeletonema costatum、远距角毛藻Chaetoceros distans、菱形海线藻Thalassionema nitzschioides、刚毛根管藻Rhizosolenia setigera;春季为中肋骨条藻Skeletonema costatum、柔弱拟菱形藻Pseudo-nitzschia delicatissima。多样性指数秋季平均为2.22,春季平均为2.22;均匀度指数秋季平均为0.50,春季平均为0.48。该海域浮游植物以广温近海种类为主,多样性指数一般,均匀度较低,秋季生物密度高于春季。

A preliminary study on the community structure of phytoplankton in the coastal waters of Yangjiang Harbor,was performed in November 2019 and March 2020.121 species were identified,mainly diatoms.The average density was 484.76×10^(5) cells/m^(3) in autumn and 126.34×10^(5) cells/m^(3) in spring,mainly diatoms.The dominant species in autumn were Skeletonema costatum,Chaetoceros distans,Thalassionema nitzschioides,Rhizosolenia setigera and Skeletonema costatum,Pseudo-nitzschia delicatissima in spring.The average of Shannon-Weaver index was 2.22 in autumn and spring,evenness index was 0.50 in autumn and 0.48 in spring.Phytoplankton were mainly eurythermic margin sea species,Shannon-Weaver index was within moderate level,evenness index was relatively low,the abundance was higher in autumn.