Although there have been extensive studies on dinoflagellate blooms in recent decades, the mechanism that allows the maintenance of blooms over long periods remains uncertain, and studies on genetically differentiated subpopulations may provide insights into this mechanism. In this study, the influence of two genetically distinct subpopulations of the dinoflagellate Cochlodinium polykrikoides, referred to as Group I and IV, on bloom duration in Korean coastal waters (KCW) was examined using a quantitative PCR (qPCR) assay. In this study, a C. polykrikoides bloom occurred over a longer period in 2009 (49 days), whereas the bloom period was shorter in 2010 (35 days). The qPCR results indicate that intraspecific bloom succession between Groups I and IV occurred in 2009, whereas only a single subpopulation (Group I) was responsible for the bloom in 2010. Based on the statistical analysis, the Group I and Group IV blooms occurred under significantly different environmental conditions (p ≤ 0.05) in terms of water temperature, pH, and phosphate concentration, and these subpopulations exhibited significantly different relationships with environmental factors, particularly water temperature (p < 0.01). This variability may allow blooms to continue through intraspecific bloom succession even after environmental conditions change. Southern KCW are affected by outer regions via the Tsushima Warm Current (TWC) every summer. Group IV (≤1108 ± 69 cells L⁻¹) was primarily observed along the route of the TWC in summer 2009, when the bloom of this subpopulation occurred in southern KCW. These results suggest that Group IV transported via the TWC may have influenced the bloom dynamics of this subpopulation in summer 2009.

尽管近几十年来对鞭毛藻的绽放进行了广泛的研究，但长期维持绽放的机制仍是不确定的，对遗传分化亚群的研究可能提供了对该机制的见解。在这项研究中，两个遗传上不同的鞭毛藻的亚群的影响Cochlodinium polykrikoides，称为I族和IV，在韩国沿海水域开花时间（KCW）使用定量PCR（qPCR）测定进行研究。在这项研究中，C。polykrikoides2009年的开花期较长（49天），而2010年的开花期较短（35天）。qPCR结果表明，2009年，I组和IV组之间发生了种内开花连续性，而2010年只有一个亚群（I组）引起了开花。基于统计分析，I组和IV组开花发生在显着下。不同的环境条件（p  ≤ 水温，pH值，和磷酸盐浓度计0.05），而这些亚群表现出与环境因素，特别是水的温度（显著不同的关系p < 0.01）。即使在环境条件改变之后，这种可变性也可以使开花持续到种内开花连续进行。每年夏天，南部的KCW都会受到对马暖流（TWC）的影响而受到外围地区的影响。IV组（≤1108±69个细胞L ^-1）主要在2009年夏季的TWC路线上观察到，当时该亚群的开花发生在南部的KCW。这些结果表明，通过TWC转运的第IV组可能在2009年夏季影响了该亚种群的开花动态。