College of Life Science and Technology, Jinan University, Guangzhou 510632, China.
College of Life Science and Technology, Jinan University, Guangzhou 510632, China.
Harmful Algae. 2023 Aug;127:102438. doi: 10.1016/j.hal.2023.102438. Epub 2023 May 5.
Domoic acid (DA) is a well-known phycotoxin that causes amnesic shellfish poisoning (ASP) and is mainly produced by diatom species belonging to the genus Pseudo-nitzschia. An annual survey was conducted monthly over the period of September 2020 to August 2021 in Daya Bay of the South China Sea to investigate the dynamics of particulate and shellfish DA and their relationships with the abundance of Pseudo-nitzschia spp. and environmental parameters. Pseudo-nitzschia spp. was one of the most dominant phytoplankton taxa, and a Pseudo-nitzschia bloom occurred during the survey with the highest abundance of 1.91 × 10 cells L. DA was detected in almost all plankton samples with the highest value of 120.7 ng L, and high DA concentrations coincided with the abundant presence of Pseudo-nitzschia. DA is prevalent in Daya Bay throughout the year, with detection rates of 98.3%, 82.6%, and 82.6% in plankton samples, in-situ and purchased shellfish, respectively. Higher DA concentrations were detected in the scallop (Chamys nobilis), with the highest concentration of 5.34 µg g. High water temperature and low DSi:DIN ratio promoted the growth of Pseudo-nitzschia and DA production. The results suggest that the increasing nitrogen loading and silicate limitation during Pseudo-nitzschia blooms together with the increase in water temperature may increase the risk of DA contamination in Daya Bay.
软骨藻酸（DA）是一种广为人知的藻毒素，可引起记忆性贝类中毒（ASP），主要由属于拟菱形藻属的硅藻产生。2020 年 9 月至 2021 年 8 月，在中国南海大亚湾进行了年度逐月调查，以研究颗粒态和贝类 DA 的动态及其与拟菱形藻属丰度和环境参数的关系。拟菱形藻属是最主要的浮游植物类群之一，调查期间发生了拟菱形藻赤潮，其丰度最高为 1.91×10 细胞 L。几乎所有浮游生物样本中均检测到 DA，其最高值为 120.7ng L，高 DA 浓度与拟菱形藻的大量存在相吻合。DA 在大亚湾全年普遍存在，浮游生物样本、现场和购买的贝类中的检出率分别为 98.3%、82.6%和 82.6%。在扇贝多宝蛤（Chamys nobilis）中检测到更高的 DA 浓度，最高浓度为 5.34µg g。较高的水温和较低的 DSi:DIN 比促进了拟菱形藻的生长和 DA 的产生。研究结果表明，拟菱形藻赤潮期间氮负荷增加和硅限制加剧，以及水温升高，可能会增加大亚湾 DA 污染的风险。
