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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Phytoplankton composition associated with physical and chemical variables during summer in the southern sea of Korea: Implication of the succession of the two toxic dinoflagellates Cochlodinium (a.k.a. Margalefidinium) polykrikoides and Alexandrium affine
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Phytoplankton composition associated with physical and chemical variables during summer in the southern sea of Korea: Implication of the succession of the two toxic dinoflagellates Cochlodinium (a.k.a. Margalefidinium) polykrikoides and Alexandrium affine

机译：在韩国南海的夏季夏季相关的浮游植物组成：两种有毒含氨基葡萄球菌（A.K.A. margalefidinium）Polykoides和Alexandrium仿射的含有两种有毒恐龙植物的含义

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Harmful algal blooms (HABs) of the dinoflagellates Cochlodinium and Alexandrium are known to have serious negative impacts on marine ecosystems and the aquaculture industry. We investigated the appearance and succession patterns of both HAB species in the southern sea of Korea and performed a bioassay using C.polykrikoides and A.affine cultures to evaluate their competitive relationship. From June to August in 2017, the surface water temperature increased from 17.4 degrees C to 26.8 degrees C, the salinity decreased from 34.2 to 30.8, and strong stratification developed. The nutrient concentrations remained low in the surface layer and high in the bottom layers. C.polykrikoides dominated in July; however, A.affine reached bloom levels throughout the study area in August. The growth experiments were carried out on each species at six water temperature (15, 20, 22.5, 25, 27.5 and 30 degrees C) and six salinity (20, 24, 26, 28, 30 and 32) levels. The maximum growth rate for C. polykrikoides (0.31 day(-1)) was measured at 25 degrees C and a salinity of 32, and for A. affine (0.43 day(-1)) at 25 degrees C and a salinity of 30. At all salinity levels, C. polykrikoides cells died within 2 days when temperature were 30 degrees C, while A.affine maintained high growth rates (0.35-0.39 day(-1)). Further, C. polykrikoides is salinity sensitive at the lowest salinity level of 20 in 25 degrees C and 27 degrees C, but A. affine did not respond sensitively to changes in salinity. In contrast, A. affine did not grow at low temperature of 15 degrees C, but C. polykrikoides could survive in high salinity range (26-32). In co-cultivation at a 1:1 cell inoculation ratio, A.affine had a competitive advantage over C. polykrikoides at all temperatures; however, when the inoculation ratios were varied, the species with a higher initial cell density showed a competitive advantage at all temperatures except 30 degrees C. Combined the field and bioassay results indicated that A. affine may have an advantage over C. polykrikoides under relatively higher temperature and low salinity conditions, which is important when evaluating the species succession and blooms in the southern sea of Korea during summer.
机译：众所周知，Dinoflagellates Cochlodinium和Alexandrium的有害藻类盛开（Habs）对海洋生态系统和水产养殖业产生严重的负面影响。我们调查了韩国南海的HAB种类的外观和连续模式，并使用C.polykrikoides和A.affine培养进行了生物测定。从6月到8月在2017年，地表水温从17.4摄氏度增加到26.8摄氏度，盐度从34.2％降至30.8，并且发育强烈的分层。营养浓度在表面层中保持低，底层高。 C.Polykrikoides在7月份占主导地位;然而，A.affine在8月份整个研究区域达到了盛开的水平。在六个水温（15,20,22.5,25,27.5和30℃）和六个盐度（20,24,26,28,30和32）水平的每种物种上进行生长实验。在25℃和32的盐度下测量C. poverkrikoides的最大生长速率（0.31天（-1））和32的盐度（0.43天（-1）），在25℃和30的盐度。在所有盐度水平中，C.Polykrikoides细胞在温度为30℃时在2天内死亡，而A.afvine保持高生长率（0.35-0.39天（-1））。此外，C.Polykrikoides在25摄氏度中的最低盐度水平和27摄氏度的最低盐度水平上是盐度敏感性，但是A.缩放没有敏感地响应盐度的变化。相比之下，A.仿射率在15摄氏度的低温下不会生长，但是C.Polykrikoides可以在高盐度范围内存活（26-32）。在1：1细胞接种比的共培养中，A.affine在所有温度下对C.Polykrikoides的竞争优势;然而，当接种比变化时，初始细胞密度较高的物种在所有温度下显示出竞争优势，除30℃之外的所有温度下。结合现场和生物测定结果表明A.染术可能在相对下的C. polykrikoides上有优势较高的温度和低盐度条件，在夏季韩国南海的评价和绽放时，这很重要。

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