2014年冬季热带西太平洋雅浦Y3海山光合色素分布及其对浮游植物群落的指示作用

应用高效液相色谱结合二极管阵列检测器分析技术，研究了西太平洋雅浦Y3海山区域2014年冬季浮游植物的光合色素组成。结果表明：100m以浅，玉米黄素（Zeax）是水柱中浓度最高的光合色素，浓度为22.64—84.31ng/L，叶绿素a（chl a）浓度在水柱中均值为（37±34） ng/L，在贫营养海区的数值范围内，水柱积分高值分布区与海山走向一致，二乙烯基叶绿素a（Dvchl a）和19''-丁酰氧岩藻黄素（19''BF）也是调查海区较高浓度的色素，在水柱中均值分别为（27±22）和（31±30） ng/L。其他色素新黄素（Neox）、叶黄素（Lute）、叶绿素b（chl b）、青绿素（Pras）平均水柱含量极低（<1.00ng/L）。通过CHEMTAX程序因子分析估算了浮游植物群落结构，调查区浮游植物群落以原绿球藻为优势藻，贡献率与环境因子不具有相关性，其次主要为蓝细菌和金藻，蓝细菌贡献率高值区分布在海山东南和东北侧0和30m水层，金藻贡献率高值区分布在75和100m水层，两者贡献率均与环境因子显著相关。

DISTRIBUTION OF PHOTOSYNTHETIC PIGMENTS AND ITS INDICATION TO PHYTOPLANKTON COMMUNITY IN YARP Y3 SEAMOUNT IN THE TROPICAL WEST PACIFIC IN WINTER 2014

The photosynthetic pigments of phytoplankton in Yarp Y3 seamount in the tropical west pacific in winter 2014 were determined in High Performance Liquid Chromatography (HPLC) and Diode Array Detector (DAD) technology. The results indicate that the concentration of zeaxanthin was the highest within 100 m water column, with a concentration of 22.64-84.31ng/L. The average concentration of chlorophyll a (chl a) in the water column was (37±34)ng/L, within the value range of oligotrophic zone. The high value of chlorophyll a water column was consistent with the northeast trending of seamounts. The concentrations of diethylene chlorophyll a (Dvchl a) and 19''-butyryl fucoflavin (19''BF) were also relatively high in the study area. The average concentrations of Dvchl a and 19''BF in the water column were (27±22)ng/L and (31±30)ng/L, respectively. The concentrations of other pigments such as neoxanthin (Neox), lutein (Lute), chlorophyll b (chl b) and prasinoxanthin (Pras) were extremely low (<1.00ng/L). In addition, we estimated the phytoplankton community structure using pigment signals and the matrix factorization program CHEMTAX. The phytoplankton community was dominated by prochlorococcus, followed by cyanobacteria and chrysophyceae. The contribution rate of prochlorococcus was not correlated with environmental factors. High contribution rate of cyanobacteria was found in the 0 and 30m water layers in the southeast and northeast of the Y3 seamount, and the contribution rate of chrysophyceae was higher in the 75 and 100m water layers. Both the contribution rates of cyanobacteria and chrysophyceae were significantly correlated with environmental factors.