Key Laboratory of Eutrophication and Red Tide Prevention, Research Center for Harmful Algae and Marine Biology, Jinan University, Guangzhou, 510632, China.
Key Laboratory of Eutrophication and Red Tide Prevention, Research Center for Harmful Algae and Marine Biology, Jinan University, Guangzhou, 510632, China.
Ecotoxicol Environ Saf. 2020 Mar 15;191:110226. doi: 10.1016/j.ecoenv.2020.110226. Epub 2020 Jan 22.
Since 2006, harmful dinoflagellate blooms of Cochlodinium geminatum have infrequently occurred in the Pearl River Estuary, South China. During late October to early November in 2018, C. geminatum blooms occurred again in the region. To investigate the blooming mechanism in certain temporal conditions, we analysed the changes in the environmental parameters and phytoplankton community structure during and after the bloom. The results indicated that the water temperature and salinity had large impacts on the bloom. During the C. geminatum bloom, the phytoplankton community structure changed and the number of dominant species decreased. After the bloom, the species number and abundance of diatoms increased, as the species diversity was recovering. Retinal was detected in the field samples and cultured C. geminatum. It has been demonstrated to exist in some algae species (e.g. Cyanophyta, Chlorophyta, Bacillariophyta, and Euglenophyt), and our results indicates that such teratogens also exist in dinoflagellates. The highest concentration of retinal was detected during the bloom. This result indicates that the retinal content may accumulate during a bloom. Retinal has been demonstrated to be a teratogenic agent and may therefore present a potential risk to aquatic organisms during a bloom episode. This research provided more comprehensive information concerning the ecological influences of C. geminatum blooms.
自 2006 年以来，中国南方珠江口偶尔会出现有害双鞭甲藻（Cochlodinium geminatum）水华。2018 年 10 月底至 11 月初，该地区再次出现双鞭甲藻水华。为了研究在特定时间条件下的水华形成机制，我们分析了水华期间和之后环境参数和浮游植物群落结构的变化。结果表明，水温盐度对水华有较大影响。在双鞭甲藻水华期间，浮游植物群落结构发生变化，优势种数量减少。水华后，硅藻的种类数和丰度增加，物种多样性得到恢复。在现场样本和培养的双鞭甲藻中都检测到了视黄醛。它存在于一些藻类（如蓝藻、绿藻、硅藻和眼虫藻）中，我们的结果表明，这种致畸剂也存在于甲藻中。在水华期间检测到视黄醛的浓度最高。这表明视黄醛含量可能在水华期间积累。视黄醛已被证明是一种致畸剂，因此在水华期间可能对水生生物构成潜在风险。本研究提供了关于双鞭甲藻水华生态影响的更全面信息。
