西赤道太平洋暖池区光合色素分布及其对浮游植物群落的指示作用

摘要

利用光合色素的生物标志性可以在“纲”水平上表征浮游植物群落结构.依托大洋科学考察 第20航次和21航次,通过对西赤道太平洋不同区域5个站位的HPLC藻类色素分析及CHEMTAX程序因子分析,获取了暖池区光合色素及浮游植物群落的垂直分布信息.结果显示在寡营养的暖池区,玉米黄素(Zeaxanthin)及乙二烯叶绿素a(DV Chl a)与叶绿素a浓度呈显著的正相关,浮游植物群落结构以蓝细菌、原绿球藻及定鞭金藻为优势藻纲,按对生物量的贡献率原绿球藻大于蓝细菌大于定鞭金藻的.蓝细菌和原绿球藻分布在真光层不同深度,而在营养盐丰富的次表层优势浮游藻类为定鞭金藻.%Photosynthetic pigments are routinely used as biomarkers for various phytoplankton taxa in "class"level. Vertical distributions of photosynthetic pigments from 5 stations in the warm pool were studied during China's DY20 and DY21 cruises in the western equatorial Pacific. Phytoplankton community structure was discussed using pigment signals and the matrix factorization program CHEMTAX. In the nutrients-depleted warm pool, the concentrations of zeaxanthin (Zea) and divinyl chlorophyll a(DV Chi a) were correlated with chlorophyll a concentration,and phytoplankton community was characterized by high contribution of cyanobacteria, prochlorophytes and haptophytes. Besides, cyanobacteria and prochloro-phytes occupied different depths of the euphotic zone,and haptophytes was the dominant algae in nutrient enrichment subsurface water.